What size air conditioner do I need to cool 3500 cu. feet?
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considering you said cu. feet (3500) with an 8 ft ceiling this would equate into a 437.5 sq ft ...a 10000 btu window unit would cool this...but if you mean 3500 sq ft...then it take about 5 1/2 tons or about 70000 btu to cool this space.i would call a hvac dealer in your area and get him to do heat gain/loss calculation...this way you would definitely know what size unit to get...
Cubic feet, or square feet?
If you're talking cubic feet and have 8' ceilings, that's a decent sized room (20x20 or so...). Depends on where you are and the R factor of your insulation, but 10,000 BTU would do well.
If you're talking square feet, that's a big damned house. Two central units, zoning, the whole works. See someone who does it for a living.
most likely answer is a 9000 BTUh unit. A 12000 BTUh unit or a 6000 BTUh could also be correct depending upon many different variables.
If your talking about one giant 3500 sq. ft room, I'd say, an equally huge 220 volt / 40,000 BTU unit. Now if you were talking about a small house or, an apartment, I'd advise putting in two or three smaller (120v/4000btu) units in the rooms where they were needed. That way, your getting direct cooling where it's needed ( window AC's "spot cool", they don't send cold down the hall and around the corner) and, you can shut the units down when a particular room isn't in use. You'll get the cooling where you need it and can cut the cost of using them at the same time
This question is asked frequently. It is not possible to determine the proper central air conditioner size based on square or cubic feet.
You need to have a professional size the home properly using a heat/cooling analysis. It will include; type and thickness of insulation in the walls & ceiling, attic, direction the house faces, number of occupants, type of siding & size of each window, with or without basement, number of floors, perimeter of house, ceiling height, etc.
A proper sized central conditioner can make the entire house comfortable. Some houses require two, 1 per floor.
Underesized units will not cool the home and will run and run and cost $$ in electrical ususge. Oversized units will ot dehumidify the house, thereby leaving everyne uncomfortable.
Call a good HVAC company and ask if they have people trained to do the heat/cooling analysis. Never buy from someone that only uses square footage to determine size.
Good Luck.
a 10,000 btu window ac will do if you are taliking about 3500cu ft.
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