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Testimonials

Read what some of our satisfied customers have to say:

Integrity personified
After another company told me I needed a NEW furnace because mine was leaking carbon monoxide, I called Air Plus for an estimate. Jim (the President) inspected my furnace and told me there was nothing wrong with it – the spill switch had just been tripped. He was right. Months later, the furnace is working great and the carbon monoxide detectors are still reading zero. I will definitely call Air Plus when I do need a furnace and so will my parents (who were visiting when he was here and just bought a house in San Diego). We also will recommend them to everyone.

CG
Scripps Ranch

On Time, Friendly and Great Work

We had our 3 year old A/C and 13 year old furnace serviced. Air-Plus was right on time, no pressure trying to sell us on upgrades or repairs. We will definatly use them again.

TS
Santee

Satisfied Customer

They were competitive with price but I was sold by his belief in the quality of the product.
Friendly, professional and did an outstanding job. Thanks AIR PLUS!

The Dahl Family
Escondido

Fair & Honest – Came Through When Another Company Failed!

We have a rental (heat pump system) in Rancho Bernardo that had only lukewarm air coming out the vents. Air Plus did a thorough set of diagnostics on the system and was able to identify the problem as a bad condenser fan motor. They fixed it the same day and our tenants were up and running. I am so glad I didn’t agree to a full system replacement recommended by the first company that I had come out!

J. Wilson
Poway

Excellent Job and Service

Air Plus replaced our gas furnace and all our ductwork and did an excellent job. Jim showed up on time, worked efficiently, and did a great job with the installation. The work was fairly priced and the service and warranty plan was also a bonus. I definitely recommend this company.

Brad E.
Clairmont

Excellent Customer Service and Products

Date of service was on December 16, 2009. We contacted Air Plus to provide us with an estimate, and Kim returned our call as well as showed up at our house at the designated time. Although her strengths are not design and installation, Jim followed through with helpful advice, as our installation was very different and complicated than most. Both provided information on the products, pro’s and con’s of the product they sell as well as others and were able to explain everything in detail. Kim was very knowledgeable on rebates and tax advice and helped us with the Rebate Form. Once the system was installed, they called us back and left a message to find out if we had any issues or questions with the product. Overall we are completely satisfied with both the service and product we received. The price is right as well. We would recommend Air Plus to anyone who needs installation or any type of assistance with their heating or cooling system.

D. Philippi and E. Barnard
Encinitas

Awesome Installation

We got 3 estimates to replace our entire heating system including ducts. Jim’s estimate was fair (not the lowest) but I immediately liked his answers to my questions. He worked us into his schedule and completed the job as promised right before Christmas. The system is just what we wanted. Kim and Jim are a great team and will do the job right for a very fair price. Call them you won’t be sorry!

K. and S. Thomas
Chula Vista

Honest and Professional

My experience with Air Plus was very positive. My first phone call to them was very informative and straight forward. Their visit to my home reinforced all the information I received on the phone. I found both Kim and Jim to be very personable yet professional. They did not push any product or insist on the most expensive. The installation was seamless and my home was in good hands.

L. Nemour
San Diego

Great Personal Service

Air Plus impressed us from all 6 other dealers. Kim in the office was helpful and positive, Jim did the most thorough inspection of our current system and made several recommendations. We chose an excellent heater from TRANE and are very happy w/ results.  We are planning to add A/C next year with Air Plus.

W. King
Encinitas
Best Service I Have Received In A Long Time

Air Plus Heating and Cooling recently installed a new furnace and air conditioner for me. I could not have been happier with the entire process. I got the perfect system for my house, at the best price, and the pleasure of working with friendly, knowledgeable professionals.

Kim was able to give us the advantages and disadvantages of the Trane products they offered resulting in us getting the right system for our home. There was no pressure to buy more than we needed. Kim is also an expert in explaining the government tax credit and rebate programs.

Jim, one of the owners, installed our new system. He started when he said he would and finished on time also – this is very rare with contractors today. He is extremely knowledge in his craft and it showed with flawless installation of our new AC and furnace.

Air Plus Heating and Cooling has earned my business for all of my future heating and cooling needs.

Mark W.
San Diego (Clairemont)
We’re Much Cooler Now!

We highly recommend Air Plus. As other reviewers have mentioned, they show up on time (a novel concept), do what they said they will do, and don’t leave until you’re satisfied. Two of the bedrooms in our house have never been cool; they get no airflow and because they face the afternoon sun, got way too warm by the end of the day. Jim came and diagnosed the problem (even taking duct-work apart before we’d even agreed to have him do the job). He made recommendations to improve the airflow in the house that none of the other contractors we talked to even considered. The bedrooms are substantially cooler now. We’re very pleased, and the Clean Effects rocks!

S. Berkowitz
Rancho Penasquitos
Wonderful to Work With

Hire Air Plus and you certainly will not be disappointed. I have worked over the last 20 years with many contractors, and they stand out in customer service, quality of workmanship, timeliness and price. In my case they replaced a 30+ year old heater with a new model – they advised me in detail and gave me many honest options. I wish everyone were like this!!

Matthias von Herrath
Del Mar
Hire Air Plus – You won’t be disapointed……..

We hired AirPlus to replace a 30+ year old heating system and air conditioner in our home. We hired them because of their professionalism and pricing, and the overall personal attention we received in the bidding process. We were not disappointed. Jim’s years of experience were critical to getting our new Trane system with Clean Effects properly installed in the available space in our 1930’s house (we had another contractor take one look at the space and decide not to bid!), and we are very pleased with their work. We are also very happy with the system Jim recommended, and we and thank him for his expertise in helping us decide the correct products for our home. We will be using AirPlus for the maintenance on the system and highly recommend them to other consumers. Thanks Jim and Kim!

Thanks again,

Tim and Kate D.
La Mesa
Cool and Comfortable…….

Air Plus is a very professional business run by caring and responsive individuals who care about their customers. They arrived on time, were thorough and very fair in their pricing. The installation of my ac system was completed as scheduled, the team was conscientious of my

home and left the work area in impeccable condition when they left.

Excellent experience…I recommend them highly!

Cindy H.
Ranch Penasquitos Very Impressed…….

Hi, Kim,

My wife and I were very pleased with the outstanding service you and Jim provided us. You both made the entire process of selecting and installing our new home cooling and heating system simple and easy. Jim explained everything very clearly to help us make the right choices for our needs. He installed everything quickly and professionally. Very impressive!! I would gladly recommend AirPlus to anyone looking for a new cooling or heating system!!

Sincerely,

Seth D. Bulow
Del Mar
Honest, Knowledgeable, and Timely…….

My husband and I are very pleased with the service and quality of airplus. We needed to have air conditioning installed in rather a quick time frame due to us having our first child on the way. The initial consultation and quote process was quick and helpful. We felt we got honest and strong technical advice, the work was then completed in a timely manner and we are very pleased with the product now that it is fully up and running. Thanks for making this an easy and great process.

Virginia and Paul H.
Allied Gardens
Super Happy in Pensaquitos…….

Dear Air Plus Staff,

When I started looking to replace my old heater and air conditioner with a heat pump, I found that Trane really had the best offerings in heat pumps. I found Air Plus was a Trane Comfort Specialist and NATE certified and I was impressed with your references. When I met with you I was particularly impressed with the knowledge and experience demonstarted by Air Plus. Another contractor had told me that I had to replace my refrigerant line to switch to the latest class of equipment but your experience told you otherwise and as a result I had to deal with much less tear up to upgrade to the lastest equipment. Jim also instantly pointed out several easy ways to improve the poor airflow in my house and yet was cost conscious when suggesting changes to my duct work, to help keep my overall cost down.

Before and during the install, Kim was always there to answer my questions and keep me up to date with the details. Our installer, Daniel, was prompt and courteous as well as extremely experienced and especially diligent to get the job done on time. Yet he was always willing to answer my questions and made sure to ask me if there was a question about positioning or routing that I might have a preference on.

We are super happy with the Trane equipment. The new variable speed fan is very quiet, but the extra mile that Air Plus normally goes to provide a superior installation also really helped quiet our particularly noisy air return. I am also excited to give the Clean Effects time to really clean out air in our house but I can already tell the difference. We are very happy with the way our install turned out and the personal and professional touch Air Plus had at every step of the way.

Sincerely,

Chris Shaw
Rancho Penasquitos

A Warm Christmas…….

Kim Warner and Jim Crawford at Air Plus are terrific! Kim thoroughly explained our options. We didn’t feel any pressure to purchase. Kim was well informed and took time to learn about our heating and AC needs and to answer our questions. Jim and his crew instaled our Trane furnace and AC on Christmas eve, 12/24/2008. They worked diligently all day. What a pleasure and relief it was to have a quiet furnace pumping out heat on Christmas morning. We would absolutely recommend Air Plus Mechanical. We are so impressed with their superb work and professionalism.

H. & R. Praba,
Tierrasanta Go with the right business…….

Okay, so I’ve never posted anything on any review site but after having my central heat/air system intalled by Air Plus, I felt compelled to say something. We (me, wife, bubs & one in the oven) just purchased a home in RP and long story short, it needed a new system. I did the usual call and bid routine with several companies (white glove guys, multi-tasking plumbing & air conditioning guys) all had good ‘sales’ people with dog & pony shows and up-sale gimmics, but here’s the deal: Air Plus does air & heat, thats it, no sales, no BS.

Jim came out, assessed the situation, told me what I needed, gave me the price, and provided the service in a timely and professional manor. No up-sales, just what I needed. They installed it, cleaned up, set the thermostat up and its been great ever since.

IMPORTANT NOTE HERE: 2 weeks after system was installed, I had called them with an issue caused by a plumber who had worked on our main gas line yesterday which interupted the furnace as it operates on gas. Anyway, I called Jim’s cell directly at well after 8PM and he returned my call within minutes to find out what the deal was; how many companies have you dealt with in the past that provide that kind of prompt service after the fact?…that’s right, not that many. If I had to do it again, I’d skip the bidding game, spend that wasted quality time with the family and just let Air Plus do what they do. Highly recommend them to anyone.

S. Delaney
Rancho Penasquitos
Barber Shop Bliss…….

Dear Ms. Warner,

I just wanted to share the wonderful experience and excellent customer service that we received on October 8, 2008! The technician, Dan, was on time, friendly, professional, and knowledgeable. Also kudos to customer service- when I called for an appointment they were also very friendly, professional, and were able to schedule an appointment right away! Not to mention the follow up afterwards, making sure that we were completely satisfied.

I did shop around some and feel you are the best company all around; price wise and value wise. Especially with the economy being as bad as it is, this is more important than ever! Not only I am enjoying the new Trane comfort system, but every single customer of mine is too! I am highly recommending Air Plus Heating & Cooling to everyone! Kind Regards from a Very Satisfied Customer!

Johnny @ Johnny Lovato’s Barber Shop
1900 Rosecrans St San Diego, Ca 92106
619-222-4753 Air Plus Gets an ‘A+’……..

If you are considering installing a new furnace or air conditioner in your house or business, we can highly recommend Air Plus Mechanical. Kim and Jim run a professional operation and we were impressed with how they handled a complex installation of a new furnace and air conditioning unit.

Our townhouse has some unusual angles, tight spots and not plumbed for A/C.  Jim spent a good deal of time carefully analyzing how best to install the equipment without having a negative impact on the structure. We also had to work at length with our homeowner’s association and were able to come up with a plan that they were amenable to.

It took a fair amount of time and back and forth communication to accomplish this, and Air Plus never pressured us to make a quick or rash decision and were helpful at every turn in the road. They were interested in getting the job done right the first time! The workers who came to install the equipment were professional and respectful of our property. The installation took an entire day and Jim came by the next day to do a final inspection.

All in all, we were extremely pleased and impressed with Kim, Jim, and their employees, and feel that we made a good decision to entrust them with this major home improvement project.

Paul Mamet & Frank Wilms
San Diego Air Problems Since 1993……Resolved!

Dear Jim and Kim,

We LOVE our new Trane system with the Clean Effects. For the first time since buying our home in 1993 we have air 100% in the master bedroom, family room, and dining room. Replacing all the duct work was worth every dime. Jim, Dan and Mike did an awesome job installing the system and ductwork. I watched the whole process. Jim was so through he took 1 hour to crawl through our nonexistent attic to diagnose what needed to be done, before we even signed the contract.

I know we will enjoy this system for the next 30 years!!! Trane is the industry leader, and once you really start researching the different products and go look at them you will see why. The CleanEffects is amazing. The air feels great. The temperature is even all over the house. No more hot spots cold spots. The fan runs all the time and you do not hear it even in the garage where it is located. We could not be more pleased with the whole process. We highly recommend Air Plus.

Amy K.
Tierrasanta
Very Pleased!…….

We are so pleased with our new Trane heating and air conditioning system! The system is efficient, extremely quiet, and easy to operate. Besides being impressed with your knowledge, professionalism and meticulous attention to detail, we were amazed at how readily you worked around the unique layout of our yard, finding just the right location for the air conditioning unit.

Your employees were courteous, experienced and diligent- in short, we felt like we were in very good hands. Your follow-up after the job, checking to see that everything was functioning well made us feel we could contact you at any time with any concerns or problems. All in all, a job well done, and we would have no hesitation referring others to Air Plus!

-Elsa Mejia & Pat Hansen
San Diego, CA

 

This One Says It All…….

Kim,

Sorry it took a few weeks to get back to you and the staff at Air Plus. This has been a busy few weeks with the fire recovery in Poway and the usual year-end deadlines. That being said, the temperature control and cleanliness in our home has never been better. The Trane heating, cooling and filtration system has been operating flawlessly and with a surprising intelligence that seamlessly transitions the household temperature between the various pre-determined set points. As we discussed, I am a professional engineer with over 27 years in program, project, construction management and environmental service lines. My experience with the Air Plus team places your firm in the top 2% of firms I have had the pleasure to engage in business and service.

The sales, engineering, and installation staff at Air Plus did an absolutely outstanding job sizing and installing our replacement 2 stage heating, cooling and ventilation system. In a home with 4 cats, 1 dog, and the recent smoke and ash impacts of the 2007 fire storm in Poway, the Clean Effects air filtration system and seven day programmable thermostat, with the auto temperature control and recirculation feature, is keeping the air in our home fresh, clean and comfortable. The setting sun no longer highlights “particles” in the room. We also had our original “builder’s grade” vents replaced. This recommended small adjustment and very low cost improvement to the overall system absolutely increased air flow and the overall efficiency of the system.

Regarding noise, the neighbors who face the XL16i 5-ton condenser are especially pleased with substantially quieter operation as compared to the 16 year old original unit you replaced. The condenser and fan have a low frequency noise that is not heard inside the house, much less across the street. The closet installed XV80i furnace and heat exchanger is pleasantly muffled as compared to the unit it replaced. Light sleepers no longer wake up to the start of the furnace.

Daily temperatures in Poway during October vary from as low as 49 and as high at 90 degrees. We have the thermostat set for a 73 (heat) and 78 (cool) range during this seasonal period. The control of the heating and cooling systems in this range is both flawless and energy efficient. I am an early riser, and have noticed the “smart” feature in the thermostat that gradually raises or lowers the temperature leading up to the programmed set point, which ensures a smooth transition between waking, working, and sleeping.

We also did our due-diligence in regards to system pricing and project references, calling and visiting commercial, service and residential clients for three different system and equipment providers. We found the TRANE equipment and control systems and, more importantly, the AIR PLUS installation and service team to be the highest rated, customer service oriented mechanical firm in North County.

The equipment installation staff was on time, courteous and demonstrated a pride in workmanship and brand loyalty. They completed their work on time and cleaned up thoroughly as the work progressed. Tim walked us through all the features of the Trane system and did not leave until he was satisfied we had the system “down pat” Kim kept us informed regarding installation start dates and gave us follow up calls to ensure we were satisfied with the work and the equipment operation.

We would not hesitate to recommend Air plus Heating and Cooling. They deliver on promises and represent Trane with exceptional customer service.”

Mark D. Claussen, PE
Poway, CA
Children, Teachers and Parents Are Amazed……

“Carmel Mountain Preschool LOVES our new Trane® heating and cooling systems with CleanEffects® air filtration! Since installation, children, parents and staff comment on fewer allergies and far fewer cold and flue symptoms. We highly recommend Trane® and Air Plus Heating & Cooling for indoor comfort, quality air and peace of mind.”

-www.CarmelMountainPreschool.com

On Jim Crawford, President, and CleanEffects® Air Filtration…..

“My wife and I are undergoing complete remodeling of our home and had consulted with several HVAC contractors over the past two years. When we met with Jim Crawford, the President of Air Plus, we knew within minutes that he was the contractor we wanted to install our system. Jim came across as honest, knowledgeable and instilled confidence in us for this investment in our home and more importantly our comfort. 

We live above the railroad tracks in Del Mar with a lot of soot, dust and salty air. We also have a dog and allergies, and there was a lot of dust in the air from the remodeling. Now there seems to be a 100% improvement in the air quality with CleanEffects®. With CleanEffects the smells don’t seem to be there, the air even smells clean.

We installed the CleanEffects® air filtration system in mid April ’06. We don’t see any dust on the ceiling lights like we did before.

The crew did a super job from start to finish.”

-B. Rothenberg , Del Mar

Dare to Compare…..

Out of five companies we obtained quotes from, Air Plus Mechanical was by far the most knowledgeable about their equipment, City code requirements, options, efficiency ratings, rebates, and tax credits. They were also the best value overall. We had an old furnace in a closet at home, and our home was not outfitted with air conditioning. Jim worked our estimate for installation of a new air conditioning unit, furnace in the attic (which saved us some valuable closet space), dual returns for proper airflow, and brand new ducting. The workers, Danny and Tim, did an excellent job of the actual installation which took 3 days. Another reason I am really impressed with this company is that it has confidence in their ability to perform the job well, hence they do not shy away from having a City inspector check their work like many other companies do. We highly recommend Air Plus Mechanical if you are considering getting a new air conditioning or heating system for your home.”

 

Happy customers,

Ken and Naoko
San Diego (San Carlos), CA

On the Air Plus Crew and Installation Process…..

“We had Air Plus install a complete heating and air conditioning system in our daughter and son-in-law’s older home. The individuals at Air Plus took the time to insure the right sized units were installed, plus care not to disturb the character of the older home. The installers were professional, explained the process and took great care to insure all debris was removed leaving the house very clean. If there are any service questions we feel confident Air Plus would be there for us. We are very pleased; Air Plus exceeded our expectations.”

-Pat & Naureen Bromley, San Diego

“(My husband) and I are very pleased with our recent new comfort system purchase from Air Plus Heating & Cooling.  From the initial salesman who came to our home and answered all our questions about the unit to the final installation team, it was a pleasure to do business with your company!”

“We were very impressed with the efficient manner in which the installation was handled and that they arrived on time.”

Sincerely,

H. & A. Picado,  San Diego (North Park)
P.S.- The installation team also did a good job cleaning up before they left!

We’re With You Before, During and After the Installation…..

“Air Plus did an outstanding job installing my new air conditioning system. Their sales and installation staff were prompt, courteous and experts at their jobs. The installers did their work within the time allotted, cleaned up after themselves, and took the time to show me how all the features of my new system worked. I received phone calls before, during and after the installation from Air Plus to advise me of the project schedule and to follow up on the finished job to make sure I was satisfied with the work. I would not hesitate to recommend this company, who not only sells a high quality product, but delivers it with excellent customer service.” 

-Gary M. Arbonies, San Diego

No Job Too Tough…..

“I wanted to say thank you for doing a very professional installation of my new heating and air conditioning system. I know that the installation wasn’t easy because my house is 80 years old, but you made it work, and everything looks great. I appreciate that you were on time, on budget, took care to protect my floors, and explained all the options before proceeding. I  would certainly recommend you to others.” 

-G. Maravilla, San Diego

Very Satisfied with Ultra-high Efficiency Equipment…..

“We are very pleased with our new ultra-high efficiency HVAC system, (XL19i A/C and XV90 furnace). Trane products are renown for their efficiency and reliability. However, the true measure of any company and its product is how the field representative interacts with the customer.

In our case, Air Plus Mechanical’s top-notch workmanship, timeliness and responsive customer service were the key elements in our complete satisfaction. From our very first explanation of products and features, complete system installation and subsequent follow-up, we have been very impressed with Air Plus Mechanical’s attention to detail and the responsive customer service.” 

-Mr. and Mrs. L. Griffin, San Diego (Rancho Penasquitos)

Not All Contractors Are Created Equally…..

“I generally don’t care much for contractors. They show up late, tack on extra charges and most do pretty poor work. Air plus on the other hand made it to their appointments, did exactly what I asked, charged me only what they bid and had the work done sooner than expected. 

The fact that I can icebox my house with my new system is pretty cool too.

I wish I had started with them.”

-Roger Greaves, Poway

Top Notch Mechanics Make All the Difference…..

“Dan (one of our installers) was a very personable worker and explained the system as he worked. He also inspected another house to see if central air could be installed. He was very eager to do everything right.” 

-Mrs. M. Meihls, San Diego

“Excellent work crew.  On time, good work habits.  Owner, Jim Crawford is very knowledgeable.”

-G. Stirling, San Diego

“Excellent product, operates efficiently and quietly. Contractor personnel were courteous, knowledgeable and very hard working. I would definitely recommend Air Plus Mechanical to family and friends. Their Better Business Bureau rating is outstanding.” 

-E. Benzwi, La Jolla

“Both gentlemen,  were very polite and professional. They started work when they arrived and worked until complete. Excellent representatives of your business.” 

-Mrs. L. Wood, Poway

Hot Upstairs, Cold Downstairs and Allergies?  Air Plus and Trane® to the Rescue!

“Dear Air Plus,

 

After procrastinating over replacing our very old, inadequate furnace for fear of the mess our house would have to be in, we finally came to conclusion that we could not suffer through another winter where we had too much heat upstairs and none downstairs.  That was when I called you!

I am knowledgeable about Trane furnaces as I am originally from Tyler, Texas where your furnaces are built and have had relatives who in the past worked for Trane.  They had told me they thought Trane was the best furnace being built at this time.  That was the reason I called you!

Your representative Jack D. came to our home to access our situation.  He was very knowledgeable about your various furnaces and we decided on a model which we felt would most meet our needs to correct the problem we had.

I was wrong about the mess!  Your two installers were able to install our furnace in two days time which included all new ductwork installed under our house.  The installers were very careful to control all dust as they cut through the floors for the vents.  Before they left, they totally cleaned up any debris in the house and even under the house.  I very much appreciated this.

What a difference this furnace has made in our house.  Although we have not yet had very cold weather, we live seven blocks from the ocean and it is always damp and cool.  We have used the furnace on cooler days and in the evening and keep the Trane CleanEffects Whole House Air Filtration System running at all times.  Because my husband has breathing problems and we have grandchildren with allergies, I was so glad to find that Trane offered this system.  We can all tell a difference in the air quality.

If you are considering buying a furnace system, please consider Air Plus Heating & Cooling and Trane.  We don’t think you’ll be disappointed.”

Sincerely,

Harvey and Carole Garrett, Point Loma

It’s Hard to Stop A Trane®…..

“I have owned Trane heating and air conditioning equipment since 1976. It took over 30 years before it finally gave up- a lot of years of satisfaction. After thorough research, I chose Air Plus Mechanical to install a new Trane system in my home. I was extremely satisfied with the entire process, from start to finish. Jim Crawford, the President was very knowledgeable and sincere during the consultation. The installation crew took extra measures to ensure that my home and furnishings were protected and they were very thorough in the explanation of the new equipment and its operation. I really enjoy my new system and love it’s quiet operation and efficiency. I would highly recommend Air Plus Mechanical, they are a company you can rely on from start to finish.” 

-I. Suyao, Poway

What the heck is HVAC?

“HVAC” is a popular abbreviation that stands for Heating, Ventilating and Air Conditioning – and can refer to a number of products, services and devices meant for climate control. HVAC systems are used in everything from submarines to skyscrapers, and even residential homes.

They work on principles of thermodynamics, fluid mechanics and heat transferring—keeping all of these forces in balance for optimal comfort. HVAC systems are popular because of their easy installation, low maintenance and operating costs.

How does an air conditioner work?

How does an air conditioner work?

Air conditioners and refrigerators work the same way. Instead of cooling just the small, insulated space inside of a refrigerator, an air conditioner cools a room, a whole house, or an entire business.

Air conditioners use chemicals that easily convert from a gas to a liquid and back again. This chemical is used to transfer heat from the air inside of a home to the outside air.

The machine has three main parts. They are a compressor, a condenser and an evaporator. The compressor and condenser are usually located on the outside air portion of the air conditioner. The evaporator is located on the inside the house, sometimes as part of a furnace. That’s the part that heats your house.

The working fluid arrives at the compressor as a cool, low-pressure gas. The compressor squeezes the fluid. This packs the molecule of the fluid closer together. The closer the molecules are together, the high its energy and its temperature.

The working fluid leaves the compressor as a hot, high pressure gas and flows into the condenser. If you looked at the air conditioner part outside a house, look for the part that has metal fins all around. The fins act just like a radiator in a car and helps the heat go away, or dissipate, more quickly.

When the working fluid leaves the condenser, its temperature is much cooler and it has changed from a gas to a liquid under high pressure. The liquid goes into the evaporator through a very tiny, narrow hole. On the other side, the liquid’s pressure drops. When it does it begins to evaporate into a gas.

As the liquid changes to gas and evaporates, it extracts heat from the air around it. The heat in the air is needed to separate the molecules of the fluid from a liquid to a gas.

The evaporator also has metal fins to help in exchange the thermal energy with the surrounding air.

By the time the working fluid leaves the evaporator, it is a cool, low pressure gas. It then returns to the compressor to begin its trip all over again.

Connected to the evaporator is a fan that circulates the air inside the house to blow across the evaporator fins. Hot air is lighter than cold air, so the hot air in the room rises to the top of a room.

There is a vent there where air is sucked into the air conditioner and goes down ducts. The hot air is used to cool the gas in the evaporator. As the heat is removed from the air, the air is cooled. It is then blown into the house through other ducts usually at the floor level.

This continues over and over and over until the room reaches the temperature you want the room cooled to. The thermostat senses that the temperature has reached the right setting and turns off the air conditioner. As the room warms up, the thermostat turns the air conditioner back on until the room reaches the temperature.

from www.energyquest.ca.gov

What is Coefficient of Performance as it relates to your air conditioning unit.

Coefficient of performance

The efficiency of a refrigeration system is measured by its coefficient of performance (COP), and is normally given as the ratio of the refrigeration effect to the compressor power:
COP = (Cooling output) / (Electrical input)

For most packaged commercial cooling units the COP varies between 2.5 and 4.0. However, some modern commercial cooling units have COPs of about 5.0. As the external temperature increases the COP is progressively reduced to about 2.0 at 40°C

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