Central Air Conditioning Unit FAQs
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Hey, There

So, - We have central air conditioning unit question? I lists some of the question; I believe we’ll ask ourselves … yes, I’m Professor Xavier.

I spend some hours reading your mind and answering this question. I also gather all the MOST WANTED QUESTION in the FBI datable and track them down. :)

If I miss THE MOST WANTED question you have the opportunity to ask. Please, DO NOT repeats the same question. I’m human; I don’t wanna waste time deleting a question.

Did I miss a Question?

If I did, our mission -

  • Search the links from old question and continue from there.


Search Other Question


Huhh – You still could not find the answer 2 your question :(


I Need Central AC Answer


(I deactivate the forum … I’ll clean the mess first)


Our 2 rules

  • No DIY or FIY questions
  • Provide detail – a lot of detail to your question

The link below is for general question only. Here is the link for the central air conditioner problems:


central air conditioning problems


The Most WANTED Questions


Question: How much should we pay for specific repair and replace part?

Answers: ohh … that question. Here is a links - Central air conditioner cost for SC

Question: Where is my central air conditioner filter?

Answers: The air conditioner filters are normally located in return duct grills, in the air handler or somewhere in the indoor furnace unit.

This is a return vents, it's on the ceiling or against a wall.


Below is the furnace unit, the filter ALWAYS near a blower house (fan) compartment. Its not within the burner, heat exchanger compartment. it could also be on top of furnace, within a slot. Read how to change air conditioner filters.


Question: How important to DO regular maintenance on central air conditioning unit?

Answers: Let’s put this way. If we don’t maintenance our central air unit, someone will be very happy. Guess, who is happy? Not us.

Read more on central air conditioning maintenance

Question: How do I add air conditioner Freon to my central air conditioning units?

Do we know what we need:

R22 or 410A or how much FREON for our AC unit?

Answers: Can we answer the question above? central air conditioner is not cheap. If we make mistake, I’m sure tech will be happy to clean the mess afterward.

We can kill 7 or more thousand dollar equipment if we did it wrong. It's best not to add Freon to our central ac unit without understanding the full detail.

To buy AC Freon, we need to be certified and to add Freon to central air conditioning unit is throwing money away.

Question: What size central air conditioner units do I need?

Answers: To have the proper size central ac units. Contractor or you need to do a load calculation. Contractor does the calculation by paper or calculation software.

Question: How do I replace my central air conditioner units?

Answers: This is one of the top question. I dislike being negative, but I’m positive, we wouldn’t spend two years in school if everyone could replace their own central air units.

To replace your central air conditioner units, you need two years of technical school and some more years of experience and you’ll need contractor license or you can just pay contractors.

Question: What does air conditioner filter do?

Dirty HVAC filte

Answers: I’m not making this up. This is one of the questions. Ac filter catch all these unseen foreign object fly over our head. It also helps central air conditioning units.

Most people don’t know what it is. I had written page on the purpose of HVAC filters.

Question: How much does a central air conditioner cost?

Answers: I had written estimation for these subjects. This is estimation of how much central ac cost.

Question: Where is the central air conditioner coils located?

Answers: In split central air conditioner units. The evaporator coils are located indoor with the blower, heat exchanger and expansion device.

Indoor central AC unit

The location of condenser coils is out door. It’s in square or around shape frame. The Ac compressor is within the condenser units.

In package central air conditioning units all the parts are outside, and the duct works are inside.

Question: How do I replace a thermostat?

Answers: I wrote page on how to replace a thermostat. This is just general information. Each air conditioner thermostat is different. It’s best to follow the Ac thermostat manual.

What Other Visitors Have Said

Click below to see contributions from other visitors to this page...

Central Ac Units Condensate Drain Pan Question 
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HVAC Thermostat Resource 
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HVAC Made in the USA! 
Is there a manufacture of residential air conditioning and heat equipment that is 100% built in the United States and that uses United States components? …

Central air conditioner fuse 
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York AC sour smell, proper UV light positioning near coils 
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Were can I locate the tonage of my air conditioning unit? 
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Heil Heat Pump Unit Shuts Down Wh.... 
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Do It Yourself? Is A NO NO NO 
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Will Installing A TXV kit on Air Handler Solve Seer Rating Problem  
Will installation of a TEV or TXV kit on my air handler/ceiling fan coil solve the problem of my air handler with a SEER of 9 and my condenser unit with …

Do I Need a New Central AC Unit? 
I have a central air conditioning unit that is 30+ years old. It will cool the downstairs of my home adequately however in the past few years it has a …

Why Is Central Ac Unit Freezing While Only Using Heat? 
we are in a deep freeze and the outside unit keeps getting ice in grill and inside unit on some copper lines, but the fan is coming on and appears to be …

Can I run my heater without compressor working 
Can you run your heater even though the outside compressor isn't working properly on your central AC/Heater system?

Central Air and Heating Not Working 
I live in Florida where it gets cold about 1 month/ yr. I've been in my house with a Lennox indoor air handler/outdoor fan/pump unit for 5 yrs without …

Why is my air conditioner sucking in the filter? 
Why is my air conditioner sucking in the filter? What kind filter should I use for my central ac unit? Dadan replies: Ok … Here is a question? …

Can Pour Some Water In Outside Ac Unit To Help It Cool The Inside? 
I live in a very old mobile home. I have heard from others that they pour water in the outside unit through the top and that it cools the inside better. …

New Central Ac Unit Runs All The Time During The Heat Of The Day 
We just purchased a 3 1/2 ton Goodman central ac unit at the end of May. We had a service tech do the Freon and silver solder the lines. We also purchased …

Older Central Cooling Air Conditioner 
When I remove the filter I can see the compressor has a hole in it. Is there a price range that I should be charged? Is it something I can replace myself? …

When Should You Replacing the Central Ac Unit ? 
We have lived in our home now for seven years, and the central air conditioner unit has been working fine up until last summer when we have experiencing …

Water under outside central air unit...problem or not? 
I have water under my central air unit outside. It is not a lot of water just enough to wet the concrete pad the unit sets on. Is this normal or something …

Central air unit shuts off each day for several hours, regardless of temp and thermostat setting 
Why is my central air conditioner unit shutting off each evening? It cuts off and will not restart until late at night, when the outside temp cools down …

Central Ac Unit Blowing Warm Air 
The central ac unit is blowing warm instead of cool. The blower is (obviously) working and the outside fan is running also. But while the fan on the …

Can a maintenance mistake cause freon to leak from unit? 
A certified Air Conditioning Tech came out and did a maintenance check on my central ac system one morning and told me that everything was okay. He …

Should I upgrade to a Variable Speed fan on my std HVAC unit? 
We are building retirement and hopefully last home. Trying to save money on upgrades (seems like everything is an upgrade). Should I upgrade to a variable …

Central Ac Unit That Was Installed And Not Needed 
I had a central air conditioner unit installed I was told I needed a new one. After the installation the new unit was doing the same thing that the old …

Leaking oil from the indoor air conditioning unit 
My indoor air conditioning unit is leaking oil on the floor. I can not see where it is coming from in the unit because it is enclosed. The outdoor …

New Central Ac Worked Great At First 
My new 2 ton central air conditioner (1500 Sf foot house) worked extremely well through May and June. A few days ago, I noticed it was warm in house and …

Outside unit has not turn on yet with the use of heat 
February 20, 2011 Hi, I am a homeowner and my central unit ran during the summer months, now that it has gotten cold i switched to heat and the outside …

New Goodmen 2 Tons Central Air Conditioner Unit 
New Goodman 2 ton central ac unit was installed 11 months ago. For the last 6 weeks the water is coming from under ac unit inside attic and 2 different …

hvac not comming on when turned on by control panel 
February 20, 2011 I noticed the ac wires were chewed through and bare wires touching each other. the control panels both work but when commanded on …

How do I find a reliable repair man 
Why does the air not reach the vent farthest from the unit, the dwelling is very small?

How do I find out what ton size my outside unit is? 
I need to find out what size unit I have bought. It's a ComfortMaker Model# AC(B or 8)036A2C1,and there is another model# below that FBA036GC1,Serial# …

Condensor Fan Motor... 
I replaced the condenser fan motor in my central ac unit. It seems as though it is rotating the opposite of old fan motor. I'm not sure, but should …

Evaporator is Make Water  
The evaporator in the attic on the indoor unit has water pouring out a lot of water and has 1 ½ water in pan, worked on it today and clean the coils and …

Central Air Conditioner Unit Help 
Our central air seem to work fine until the temp goes over about 92 and the humidity goes up, we live in Arkansas. Some rooms are at 80 degrees and …

Can an existing freon heat pump be serviced under the new federal ban of freon? 
I have a 20 SEER Carrier Heat Pump in excellent condition. I was told that the local service company no longer services my central air condiitoner unit …

Can Water Damage Outside AC Unit 
So the wife and I have noticed that our central air conditioner unit has been a little louder than normal. We called for a technician to come out but …

Single Story with 2 Central AC Units? 
I am purchasing a home that currently has 2 central air conditioner units. The house is 2300 square feet with 3 bedrooms and a large great room. One …

Why does my floor vents have water in them? 
My air conditioner is leaking water in the inside of the house. The drip pan is overflowing and water is in the vents in the floor. I don't know what is …

Will It Hurt Your Central AC If You Run It Without Freon? 
I read that I should leave my central air conditioner on for several hours to get it operational - it is blowing out hot air. The Ac unit is 3 years …

air conditioner compressor repair 
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Central Ac Not Cooling Properly 
My A/c unit has not been keeping up with the settings. I have it set at 76 degrees and it was up to 80 degrees and would not go down. I live in Louisiana …

Flipping the switch on thermostat to fan on vs auto 
if you go to your thermostat and set it to fan on, should the air unit outside be turning on at all?

High Efficiency Heat Pump / AC unit 
O.k. I think i tried accessing this site back in the winter when our heat pump wasn't working properly. Now, it's summer and we are experiencing some …

Compressor not running, but condenser fan is 
Today, my air conditioner unit decided to give up the ghost for some reason. The unit inside the house is running, as well as the condenser fan, but the …

Central air conditioning units question 
I have a Ducane central air conditioner unit . When it was installed the unit would blow air out the top. The last 2 summers, it now "sucks" air in …

Carrier Central Air Conditioner Not Cooling 
I have a carrier tech2000ss central air conditioning unit . Turn air conditioning unit on yesterday and left for the day. Came home and house was warm. …

Why Won't Our House Stay Cool? 
Our central ac unit seems to be blowing out cold air like it's supposed to, but the house will not stay cool. We have the thermostat set on 70, but …

Turning off central air condition system 
Is it hard on a central air conditioner if I turn it off for months at a time? I have a home in Hawaii and the bill is really high in the summer with …

Air Conditioner Filter Drier 
My home ac unit quit cooling. The service tech said it did not have a filter drier in the line and most likely some debris got in the expansion valve …

Does an AC unit use more electricity if it is not functioning properly 
Does an AC unit use more electricity if it is not functioning properly...for example... a capacitor going out? My electric bill skyrocketed from May to …

Info on used Bryant A/C unit 
We have been offered a Bryant used A/C unit built in 2004, removed from a model home. It has been on the shelf for resale for three years. I know nothing …

York "fresh vent" Recycling Fan Runs Continuously Not rated yet
February 18, 2011 York central ac unit is two years old, it was installed in a new construction home. Central ac unit and heat run just fine, but …

Central Air Conditioning Unit Not rated yet
Hi, I have a central air conditioning unit that's five years old. Recently I had to have someone put five pounds of refrigerant into the ac unit, so the …

Decide On Central Ac Unit Not rated yet
Decided on a new central ac unit is not easy task. Don’t feel bad. Just between you and I, - I have hard time decide on cereal! I understand that some …

Run 2 Central Ac For 2 Story Home Not rated yet
Do both units in a two story home need to run in order to balance the cooling process? In a 2 story home with two separate units for each floor, is …

How to use a Manifold Set on Home A/C System? Not rated yet
Do you have any videos for Home air conditioner system? My Trane A/C unit leaks air. I have to call a technician every year and paid over $100.00 for refill …

My central air conditioner units won't work Not rated yet
Follow this step, if the central ac unit is completely OFF. Check breaker and fuse ONLY This is JUST MY OPINION, ALWAYS call tech - Dadan …

Electrical short in AC unit Not rated yet
I have a short in home AC. I have located the short to the 2 yellow wires (24V) that connect to the outdoor unit. They both end at a metal tube. I am …


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