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Old 07-16-2007, 03:25 PM   #1
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Central AC not cooling 2nd Floor


Hello,

I've just purchased a small (600 sq ft/floor) semiattached triplex a little over a year ago. I have central ac and heating. In the winter, the heat didn't heat the 2nd floor and now in the summer, the ac didn't cool the 2nd floor. I replaced the furnace and outside ac unit after getting 4 consultations telling me that the systems are old and inefficient. Currently I have a brand new 3-3.5 ton ac unit (85,000 BTU's) and this is still not cooling the 2nd floor. Could someone please tell me what else may be wrong with the system? Any advice or guidance would be greatly appreciated.

Thanks.

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Old 07-16-2007, 08:27 PM   #2
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Central AC not cooling 2nd Floor


Wow... 3.5 tons for 600 sq feet? Has anybody checked the ductwork?

Seems to me it should be freezing right about now in there!

Something has to be wrong somewhere other than the unit if its functioning properly.

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Old 07-16-2007, 08:29 PM   #3
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Central AC not cooling 2nd Floor


Call back the company. It must be under warranty?


There may be a leak and you may be losing the refrigerant.
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Old 07-16-2007, 08:47 PM   #4
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Central AC not cooling 2nd Floor


Good point YM..

Confirm the unit before you look for other issues.
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Old 07-16-2007, 09:22 PM   #5
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Central AC not cooling 2nd Floor


Ductwork....1-1/2 ton unit should have done it, if the ductwork was correct. I don't think you have a leak. The unit is cycling on the t-State which is probably on the 1st floor.

Buckeyetech

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Old 07-17-2007, 09:05 AM   #6
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Central AC not cooling 2nd Floor


Thank you all for the tips. I just want to clear up that the townhouse is 600 sq ft per floor. Thus, the total sq ft are about 1800. Sorry I wasn't clear in my original post.

Do you still feel that 3.5 tons is still sufficient for this home? How would the ductwork be checked without ripping out the walls?

Buckeytech - what does "the t-state" mean?

thanks

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Old 07-17-2007, 04:10 PM   #7
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Central AC not cooling 2nd Floor


Just as a rule of thumb.,,3-1/2 tons should be enough for 1800 square feet. But the way the house is unsulated, the number of windows, your climate etc go into the calculations. But to be really sure the contractor should have done a heat loss and gain on the house.

You might be able to find the size of the duct work by checking the chase where the ducts go up or searching through the registers.

In my opinion you need a GOOD contractor to trouble shoot it.

T-Stat = Thermostat

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