Question about Carrier 38CKC042 Air Conditioner

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I have 38CKC03650. My house is 1801 sq ft but features vaulted ceilings in master bedroom and bathroom greatroom. The unit cannot keep the house cool in the summer. Specifically the house temperature is no cooler that 10-15 degrees than outside. The unit was installed when we had the house built in 2001. The builder said the unit complied with the sqaure footage but I beg to differ as I don't believe the volume of air needed to be cooled was considered. Recommendations?

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

refritech08
  • 149 Answers

SOURCE: air conditioning unit not cooling

the problem sounds like a defective capacitor its located on the condensing unit outside, also a contactor that is used can be defective also.

Posted on Jun 15, 2008

  • 18 Answers

SOURCE: Carrier Air Conditioner, cool air then runs luke warm air

Have you checked the freon level in this unit? If you are low or there is a leak it could be the problem. Hope this helps.

Posted on Dec 11, 2008

  • 149 Answers

SOURCE: My carrier air conditioning unit does not cool below 72 degrees

The unit has lost part of it's charge, and will need recharged. For that reason a leak must be found and repaired or it all will reoccur again.

Posted on Jun 28, 2009

  • 1 Answer

SOURCE: Problem with new Carrier Infinity 96 gas furnace

carrier infinity 96 furnace went to turn down the thermostat and their was no power to it and the furnace doesnt run

Posted on Jan 14, 2010

SOURCE: My unit is running but not blowing cool air. I

Sometimes on new units it is common for the fan to not start until you give it a push. Did you happen to hear if the compressor was operating? If the unit was froze-up the Insulated Suction line would also be iced over as well. If it wasn`t it is more likely that either the compressor was not operating or it shutoff due to
high discharge pressure and can only be reset on its
own or cooling the compressor off with cold water.

Posted on Jun 15, 2010

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How to measure air conditioning tonnage to square feet of hom


Read size of air conditioner you need , each ton of air conditioning will keep cool 400 square.so higher ton yo pick you feel cool.please read below square feet to ton chart.
1 ton on 400 sq. ft.
2 ton on 800 sq. ft.
3 ton on 2000 sq. ft.
5 ton on 2570 sq. ft.

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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.

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My landlord installed this brand new out of the box. Our apt is 900 sq ft tops. This unit can't even cool down our living room and kitchen. If the whole 2 bedroom apt is 900 sq ft, you can imagine how...


The AC your landlord installed is rated at 8000 btu which is way too small for 900 sq ft. You need at least a 15000 Btu Air conditioner and a 'well insulated' house to be cool.
A good rule of thumb in the AC business says you need 1 ton (12000 btu) of Air conditioning for every 600 sq feet (if the house is well insulated) - if not - then you will need 1 ton (12000 btu) for every 400 sq feet.
So, if you have 900 sq feet and the house is well insulated you should have at least a 15000 btu unit.
If it's not well insulated you will need 24,000 btu.

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The unit is not cooling the room. It is only comforting when you are in direct line of it.


you need to find out the size of the unit.
Rule of thumb - for every 600 sq ft of cooling area (in a well insulated house) you will need 1 ton of air conditioning. 1 ton = 12000 btu.
So, if your cooling area is 600 sq ft you would need an AC which was rated at 12000 btu, assuming your house is well insulated.
If it is not insulated well - you might need a bigger unit, i.e. 15000 btu.

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We have an older model Lennox ac model #HS26-461-P and we are trying to find out what the tonnage is. Can you tell me where to look or if you know what it is will you please tell me?


The answer that (TheMobilian) left couldn't be further from the truth, of offense. So you're saying if you have a 1000 sq ft house with 4 bedrooms you'd have 4.5 tons of cooling? That's insane, the compressor in that system would be shot in about 6 months from short cycling. Their are many factors in sizing equipment, but none of them involve how many bedrooms you have. If you don't know how to calculate load from windows and insulation factor, then you can use the old (1 ton per 500-550 sq ft) that will get you close.

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1 Answer

I have an '06 model combination cooling and heatin


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This is just a slight possibility. You may have inadequate exhaust. Open more windows or doors. For every 1,000 CFM of air delivery 2 sq. ft. of unrestricted air relief is required. Check the water distribution system for insufficient water to the pads. Check the pads to ensure they are not clogged and clean if needed.

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Random "Cracking" Noise


Its refrigerant gas has leaked out so ice is forming on the evaporator which breaks and causes this cracking sound. The same is resulting in less cooling as well. Get the refrigerant gas pressure checked and fixed.

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