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I have 2 cental a/c units in my home. The 2 1/2 ton unit cooled great until abut a week ago. Now I cannot get it too cool lower than 78-79 degrees and it runs constantly unless I turn the themostat higher than 79 degrees. The freon level is correct, the coils are clean and so is the filter. What do you think the problem could be??

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I like this one it challenging first do you know the refrigerant pressure?should be at least 65 psi for r-22 has any thing changed in the ducting? is the fan turning the correct direction?dan

Posted on Jul 18, 2008

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Brand New 2 weeks old 4 ton Trane compressor leaks a lot of water onto pad


If the unit is running in cold weather than there is ice building up on the coils located outside. This is normal in that the unit is running in heat pump mode heating inside and cooling outside, After the unit detects the ice build up it briefly reverses the cycle heating the outside coils melting(defrosting) the ice which you observe as water on the pad.

The video gives you an example of the defrost cycle!
2012 Trane XL15i Heat Pump Defrost Cycle Steam Show

Dec 21, 2015 | Air Conditioners

1 Answer

Hello. I have a Bryant 561CJ030-D AC unit. The fan comes on but doesn't seem to be cooling. We have had record high temps the past couple of weeks (over 100 degrees), and I'm wondering if the...


Is the compressor turning on? The fan may be running, but you will not get cooling effect unless the compressor is circulating refrigerant. It appears your unit is a 2.5 ton unit. What is the square footage of the space being cooled? Is the space insulated?

Aug 04, 2011 | Air Conditioners

1 Answer

I just had 'goodman gpc1336h41ab' 13.00 seer unit installed , I have a 1250 sq. ft. home and it just doesnt seem to be cooling. The unit runs constantly. So my question is , is my unit big enough...


There are a few variables that determine the size needed to cool your home - the size of your home, type insulation, are just two. I have a 2600 sq ft home - about 1300 sq ft per floor. I choose to cool the entire second floor (bedrooms and baths) and two of the largest rooms on the first floor (kitchen & living room) via flexible ducts from an air handler installed in my attic. My house was built in 1960, and at the time had electric heat. This means it is fully insulated. I replaced all the windows with energy efficient types, and vinyl sided. I installed soffit, ridge and gable vents to keep my attic well ventilated. I can cool my house in Boston, MA to 70 degrees (when it is 85 degrees inside) with a 4 ton unit in a little over an hour with no problem (one ton of cooling is equal to about 12,000 BTUs). Your condenser should not run non-stop. If it is not cooling then it is not a thermostat problem, but could be a gas charge problem. If you haven't paid the contractor in full yet - that may be the reason why. The contractor should know how much cooling you need for the space you have and installed a properly sized unit. Make sure your air filters on the return are clean and replaced regularly. Call the contractor and explain the problem - he should be able to solve it for you very quickly.

Aug 03, 2011 | Air Conditioners

1 Answer

FAC122P1A I have a small 2 bedroom apt. maybe 700sq. ft. with bedroom doors closed the unit isnt cooling apt. as well as it did even a couple of weeks ago. The unit is blowing cool air but not enough to...


This unit probably need to be cleaned. Im in St. louis MO and its above 100 degrees with a heat index of 116 if your area is experiencing this kind of heat as we are there may be nothing wrong at all A/C units are designed up to 95 degrees when it get hotter than that the units never shut off till night fall.

Jul 21, 2011 | Carrier YC273D Air Conditioner Window/Wall

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One year old Amana ASZ 16 (replaced inside and outside units last year) - works fune until the last two weeks, now home at 5pm, reset the thermostat from 82 degrees to 76 or 77 to cool off house (which...


Sounds like the system is either over charged with freon or under sized. Call the same people back out ask for a supervisor to come out and check out the system any other company will charge you.

Jun 10, 2011 | Amana Air Conditioners

1 Answer

Air condition unit of sufficient size??


You currently own a 2.5 ton AC Unit
500 square feet equals a ton of cooling/ you need a 3.5 ton unit.
If your home is well insulated, good windows and doors and pretty good
shade that covers your house, then I can see a 3ton unit cooling your
house.

Thats another 6,000 btus you do not have and that is a best case for a
energy effcient home.

Jul 07, 2010 | Carrier 38CKC030 Air Conditioner

1 Answer

Over Tonnage A/C


A better solution than undersizing the fan (which would decrease your airflow and probably not satisfy the household as well) would be to change the deadband in your thermostat. (Disclaimer: best solution is always to have a properly sized unit!).
Most programmable thermostats have a "deadband" that can be programmed in. This deadband is a certain number of degrees, in heating and/or cooling, where the thermostat will not call the system even though you have reached a threshold temperature. I.e. System is set to call for cooling at 76 degrees. there is a 3 degree deadband. When the Tstat reads 76 it will add the deadband (3) and not call for cooling until the room temperature is 79. This will prevent the compressor from cycling quite so much.
Adjust your setpoint temperatures (i.e.76) with the deadband in mind and you can arrive at a range that is comfortable and reduces compressor cycling.
Good Luck!

Jun 01, 2010 | Air Conditioners

1 Answer

Compressor size


Square footage is how you determine what size of an AC you need, say two bedroom house with 1500 square feet would require a 3 ton unit but I would go to a 4 or 5 ton depending on brand and what you may do in the future, Like adding a bedroom or bathroom and how many people will be living in the house, a heat pump normally last longer the bigger it is and is more efficient than a smaller size. Just think like this, a 3 ton will run 30 minutes to an hour longer to cool the same space as a 5 ton so if the five ton does it 30 minutes faster it will not run as long. And when it has to pull down the temperature again it will do it much faster. So less run time means faster heat or cooling and less energy is used. I have found that the bigger units are made better and last longer as a general rule. And to understand the 3-ton and 5 ton let me say that it means how long it takes 3 tons of ice to bring the temperature down 10 degrees, the old BTU’s British thermal units. However the bigger the unit the more well built it is normally and the less maintenance required. 5 tons of ice would get it cooler faster. But one thing to keep in mind a heat pump is only good for 20 degrees temperature range, for instance if the high range is 80 then the low side would be 60 in order for it to be efficient so if you have it set in the house at 72 degrees on the high side and low side would be 52 degrees. But the larger the unit the less time it would take it to recover from the heat differential.

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2 Answers

Can Air Handler !1/2 ton run with 2 ton


Its done all the time. It is sometimes better to do this because you run a colder coil and rmoves more humidity. The newer unit have variable speed fan and run slower to do the same thing. Remember the lower the humidity the higher you can raise your tsta. Example In arizona at 95 degrees you dont feel the heat as much because of the lower humidity. Its ok to do so. You get more btus out of your unit that way. Rus. I have dozens of units with air handlers 1/2 ton smaller...

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1 Answer

Air Handler Blower


if you have a meat thermometer, place it in the vent when the air is on, it should be cooling somewhere around 15-18 degrees F lower than what actually temp is, so if its 84 degrees, your unit should blow around 67 degree air out of the vent. if it is not call a tech. your system could be under or over charged.

Jun 21, 2009 | Goodman CLQ36AR49 Air Conditioner

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