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Central Air Conditioning Unit FAQs

Frequently Asked Central Air Conditioning Unit Questions

Homeowners seem to ask the same question online and as I’m working. So, here the most frequently questions I received in the field and online. Oh, by the way.

If you need advice on your central air conditioning units ask other homeowners. I’m pretty sure other homeowners have the answers to your question.

Submission Guidelines:

    Before you ask a question, make sure to search the links from old question and continue from there.

    For example:

    You have a question involving noise within central ac units. You search the links for noise and you found it.

    Click it. Then scroll to the bottom. You should see

    “Click here to read or post comments.” And continue from here.

    If you didn’t find links for Noise? Create new question.

  1. No DIY or FIY questions. We protect other peoples.

  2. Provide as much detail as possible. That is the only way to get a better answer for your question.


Need Central AC Advice

&

Read and Answers Other Question


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


central air conditioning problems


The Most Frequently Asked Questions

Question: How much you charge?

Answers: I’ll just leave this question blank! I charge differently and so are the technicians. If I were to tell you it’ll be wrong.

Question: Where is my central air conditioner filter?

Answers: The air conditioner filters are normally located in return duct grills or in the air handler. Read how to change air conditioner filters.

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

Answers: To buy ac Freon you need to be certified and to add ac Freon to central air conditioning unit is risky.

You can kill 7 or more thousand dollar equipment if you do it wrong. I highly suggest you don’t try adding Freon.

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: I kept getting this question online and I kept deleting it. Homeowners can’t replace their central air units. That is kind of negative, so I’ll be positive.

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?

Answers: Ac filters are design to help your central air conditioner units and clean indoor air a bit.

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.

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, but 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.

Need Central Air Conditioning Unit Advice

Above I attempted to list and answers what most homeowners want to know. Below is a form you'll use to ask questions.

Please, No Do It Yourself Question. It’s Too Risky


This site is designed for homeowners, so help other homeowners that need a central air conditioner advice.

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What Other Visitors Have Said

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

Can a maintenance mistake cause freon to leak from unit?  starstarstarstarstar
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 ...

Does an AC unit use more electricity if it is not functioning properly  starstarstarstarstar
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 ...

Central Ac Unit That Was Installed And Not Needed  starstarstarstarstar
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 ...

Are upstairs air returns necessary in an older home (1945) ?  starstarstarstarstar
I am having a forced air furnace replaced and AC added. The contractor says that air returns are not necessary on the 2nd floor because its an older home ...

Do I Have Central Air Conditioning  starstarstarstarstar
I live in a rental property... The thermostat says we have air but when I set it to cool it doesn't cool the house down.

We have a Carrier Furnace ...

Leaking oil from the indoor air conditioning unit  starstarstarstarstar
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  starstarstarstarstar
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 ...

Freon Valve  starstarstarstarstar
My Airtemp 1104-02 central ac unit is not cooling my house, so I call the service man. He said it needs recharging but he will have to put a valve on the ...

My central ac pan is overflowing and leaking water   starstarstarstarstar
My ac pan is overflowing and leaking water into my home. How do I fix this? I have a Trane central air conditioner unit.I have removed the front face panels ...

How to use a Manifold Set on Home A/C System?  starstarstarstarstar
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 ...

Central Air Conditioner Unit  starstarstarstarstar
I just had Ac unit installed with the coil inside and the unit outside. Do I need a return vent? It is not cooling at all.

I would have been better ...

New Goodmen 2 Tons Central Air Conditioner Unit  starstarstarstarstar
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 ...

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

Remounting front panels on an older Carrier AC unit  starstarstarstarstar
I removed the 2 front panels/doors in order to change the filter, but I cannot seem to fit the bottom panel back in correctly.

I put the top door ...

Condensor Fan Motor...  starstarstarstarstar
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   starstarstarstarstar
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 ...

Cracked Pan in Evaporator Coil Unit  starstarstarstarstar
I was informed that the pan is cracked in the fan coil. Is it true that I will to replace the entire unit? Or can the drain pan itself just be replaced?...

Central Air Conditioner Unit Help  starstarstarstarstar
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?  starstarstarstarstar
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  starstarstarstarstar
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 they ...

Single Story with 2 Central AC Units?  starstarstarstarstar
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 ...

No Water Draining On Outside Of House  starstarstarstarstar
I have had my ac unit on about 2 hrs. and no water is draining from the tube outside. It is definitely cooling the house down so I think its working ok....

Why does my floor vents have water in them?  starstarstarstarstar
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 ...

How Does An Ac Work?  starstarstarstarstar
I was told an ac heats to cool? is this true and if so, how does it work? (seems odd to cool by heating)

air conditioner compressor repair  starstarstarstarstar
can the compressor unit be replaced without changing the entire system

High Efficiency Heat Pump / AC unit  starstarstarstarstar
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 ...

What Size Central AC Unit Will I Need? 2 1/2 or 3 ton  starstarstarstarstar
What size condenser will I need? I have a 2000 sqf. two story all in the full sun and no shade. Windows do leak somewhat and there are about 280 sqf. of ...

On a 30,000 btu air handler, what is the average cfm?  starstarstarstarstar
On a 30,000 btu air handler, what is the average cfm? The unit is a Goodman central air only. From 1992, I think a 10 seer.

The Fan On The Unit Outside Is Running All The Time  starstarstarstarstar
When the central air conditioning unit is on the unit outside runs all the time. when the indoor unit stops running the fan outside stays on. any ideas ...

Central air conditioning units question  starstarstarstarstar
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 ...

How Do You Check For Super Heat?  starstarstarstarstar
How do you check for super heat?

What is the source of water collecting in the pan under my central ac unit   starstarstarstarstar
Can someone tell me why I am collecting water in the pan under my central air conditioning unit in my attic? It is draining to the outside.

How Do I Clean The Unit Outside  starstarstarstarstar
Need to know this best way to clean the unit outside

Carrier Central Air Conditioner Not Cooling  starstarstarstarstar
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....

increased noise from central air conditioner units  starstarstarstarstar
My central air conditioner seems to work fine, but lately it is louder than usual. mostly I hear a noise that resembles a "click" when it turns on (coming ...

Central air conditioner take 30 min to come on  starstarstarstarstar
I turn my central air conditioner on and sometimes it takes over 30 minutes to come on. Even if I turn it all the way down to 50


How can I find out what size central ac unit I have?  starstarstarstarstar
I have an old Ruud central ac unit, model #UAHE 030JAS serial# 4008 Mo889 4826. What size (in tonnage) is it?

Central air conditioner units cycle on and off while cooling  starstarstarstarstar
My central ac system continually turns on and off when cooling. I had changed the thermostat but it still goes on and off. The system does cool but it ...

Maintenance of my HEIL Quiet Comfort DX1300  starstarstarstarstar
This central air conditioning unit was purchased new in Sept 2006 but not used much that year. Normal use in 2007,08 and 09. Other than changing the air ...

Temperature and Pressure Charts   starstarstarstarstar
For a given City ( Ambient Conditions ) , can you give me Temp & Pressure of a refrigerant system working on R-22 Gas.

Water in the drain pan.  starstarstarstarstar
Is it normal to have water in the drain pan of the evaporator / blower in the attic. Some times it seems to really flow through the pipe out side?

Add Air Conditioner Freon  starstarstarstarstar
What are the indicators that Ac Freon needs to be added to my central air conditioner unit?

Central AC unit is on even though the thermostat is set on "heat"   starstarstarstarstar
My A/C unit is on - the blade in the condenser unit outside is running even though the thermostat is set on "heat" mode. The heat furnace is okay. In order ...

Central air conditioner units evaporator coils have frost..why??  starstarstarstarstar
The coils in my inside central air conditioner unit have frost on some of them. What causes this?



Do I have a broken Ac thermostat?  starstarstarstarstar
I have central air conditioners and my units run but no heat or cool come into the house? Is my thermostat broken?

Turning off central air condition system  starstarstarstarstar
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 ...

Should I go with a Rheem or Coleman unit?  starstarstarstarstar
Should I go with a Rheem Ac or Coleman central ac system

Who is the maker of my ac units? I have model #  starstarstarstarstar
M/N # E2RC048S506G

I continue to have problems with my unit and would like to know the make of my unit, the brand of the unit, the age of my unit,...

The three line with the rotary compressors?  starstarstarstarstar
How to find out the suction line, and discharge and process line in rotary compressor if it is not mentioned in the compressor ?

How to determine the amount of refrigerant needed  starstarstarstarstar
Hello,

I really want know how do technicians calculate how much refrigerant does a system require to operate efficiently? Use R410 as example

Thanks...

Info on used Bryant A/C unit  starstarstarstarstar
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 ...

what is wrong with my air condition unit  starstarstarstar
I will set the Ac unit of 71 degrees and in about 4 hours or so later the unit has a temperature of 74 degrees is this normal or do I need a service ...

what is the need of capillary tube?  starstarstarstar
Why capillary tube used in Air refrigeration?

Capacity of the room  starstarstarstar
How we can find out the capacity of the room

How to vacuum an central ac units  starstarstarstar
how to vacuum a central air conditioner and where to put the hoses to vacuum a central air conditioner

Electrical short in AC unit  starstarstarstar
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 not ...

Is the condenser fan supposed to spin at all times?   starstarstarstar
The condenser fan at the top of my central air conditioner will not spin. I can't watch it all the time: are there times when it dos not spin?

My central air conditioner units won't work  star
Why does my central air conditioner not working?

Decide On Central Ac Unit  Not rated yet
New Home - trying to get info about AC systems.

Should we get a variable speed indoor unit or not?

Is the system matched?

Why if my outside unit ...

Central Ac Unit Drainage Issue   Not rated yet
Central ac unit is not draining properly.. The past few days the ac unit set @ 78 and the water generally runs from the unit to a hole in the floor and ...

Amana Central Ac Loud Hum Not Working  Not rated yet
My Amana central air/gas heating system has a problem. The AC has been running for about 10 days. Now when it starts, the blower only makes a loud hum ...

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 ...

Should line set be replaced with replacement of Central AC unit?  Not rated yet
The unit we are replacing is 22 year old. Should a new line set be installed or existing one blown out? We had three estimates and two include a new line ...

Does Carrier have a side blow central air conditioner?  Not rated yet
My current central air conditioner (fedders brand)is located underneath my deck. It is shaped like a box and dimensions are; 18-1/2 inches height, 29 inches ...

WHERE CAN I GET THE CALCULATION FIGURES   Not rated yet
I LIVE IN BLUE SPRINGS MO. THE AVERAGE HUM. IS 87% AND THE TEMP. AVG. IS 88.

I HAVE A 1650 sq.' HOUSE PLUSE HALF BASEMENT. WHERE CAN I GET THE FIGURES ...

How do I find out what ton size my outside unit is?  Not rated yet
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# L965060129,...

How can I determine the tonnage of my current unit if the model and serial number have worn off?  Not rated yet
Approximately 20 years old. Thanks for the help.

which line should to warm  Not rated yet
carrier scroll unit with puron, electric heat, liquid line cold , suction line so hot it burned my hand.

What is temperature blowing out the register supposed to be?  Not rated yet
I just had a carrier heat pump air conditioner installed. The temperature blowing out did not seem cold to me. They tested the farthest vent in the house ...

Compressor late to start  Not rated yet
When the thermostat calls for cooling the air handler starts and the compressor fan starts all before the compressor which comes on about 30 seconds later....

Will It Hurt Your Central AC If You Run It Without Freon?  Not rated yet
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 ...

Install programmable thermostat, now unit continues to run when thermostat clicks off.  Not rated yet
I had programmable thermostat installed on a 20 year old unit. Now unit (outside) continues to run when the thermostat clicks off. What the problems?...

Flipping the switch on thermostat to fan on vs auto  Not rated yet
if you go to your thermostat and set it to fan on, should the air unit outside be turning on at all?

Tonage on York Air Conditioner  Not rated yet
What is the tonnage on York model number H2DI1030S06B?

How to tell what SEER rating my new centra ac is.  Not rated yet
I have the model and serial number on the new Gibson HVAC system installed. Since I have not seen any discernible changes in my utility bills, I'm questioning ...

The condenser fan sucks air instead of blowing it out.   Not rated yet
I have an arcoaire unit performance max 14 36000 btu's on the condenser unit the fan sucks air in instead of blowing it out is this right,I thought all ...

4 ton or 5 ton central air conditioner?  Not rated yet
I have a 2100 sf home with 12 ft ceilings and open floor plan. I am located in North texas where we have high 90s to 105 for two and a half months per ...

Can You Replace The Evaporator Pan  Not rated yet
I checked the regular condensation drain hole from the A coil and it is not blocked. Upon further investigation, I found the attached pan under the A ...

Ac Compressor Covered In Ice.  Not rated yet
Condenser motor (? large unit under the fan outside) has ice around it. Also has ice along the hose, all the way inside to my air conditioning unit. Why?...

Do I Need To Install A Trap On My Line  Not rated yet
Do I need a trap on my lines with condenser below my coil.

Central Air Conditioning Unit Qestion  Not rated yet
Air conditoner units question

Which type of TXV for suva 81 or R502 ?  Not rated yet
Which type of TXV for suva 81 or R502 ?

Next,can you provide me TXV and Gas Type

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