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Old 06-04-2015, 09:09 PM   #1
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Window unit sizin

Hi all, I live in Chicago area and have split level home with 5 levels: basement, family room (partially below grade), kitchen/living, bedrooms, and a 13x25 attic room. We've got a single central air unit that does fine on the lower floors, but that attic room is still really warm. That room is also my wife's home office and she works in the afternoon/evening so she's uncomfortable during the summer. It also doubles as a guest bedroom. I was going to get a window air conditioner for that room but can't decide between 8000 BTU and 10000 BTU. Would there be that much of an efficiency or power consumption difference between the two? We are also thinking of doing new furnace/AC in the next year or two so I'm planning to ask the contractor about how to fix this without relying on a window unit.


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Old 06-05-2015, 04:17 AM   #2
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8,000 should be plenty if your only using it as a supplement to the central A/C.

Too big, and the humidity could get too high.


When posting in certain forums, knowing your location will help others give better feedback/advice/solutions to your questions.
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Old 06-05-2015, 05:11 AM   #3
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For a single room I would go with a 5000 BTU unit particularly as it is a supplement . I use a 5500 unit to cool my office bedroom which has a large Apple Power Mac tower computer, a laser printer, a Mac mini, three monitors, and all my network equipment . The room is on the south side of the house (lots of heat lid from the sun) . I don't have central air and this unit is capable of turning the room into a meat locker if I turn it up all the way. 10000 BTU will be over kill and I think 8000 will be was well. I cool my 5 room 1000sq ft downstairs with a 12000 BTU and that is marginally oversized
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Old 06-06-2015, 06:59 AM   #4
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Thanks for the info, the 10000 is definitely out. Hadn't thought of just using a 5000 though since it's just supplemental. Only thing that would concern me is times when the window unit would be on but the central air would be off since sometimes temp is fine in the rest of the house. I guess that wouldn't be very often though. Jimn01, for reference how big is your office room that you are using the 5000 unit for?
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Old 06-06-2015, 12:19 PM   #5
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Before you put in a window shaker, I suggest looking at portable units as well. They are on wheels so it's easier to hide in the closet when it's not needed. They are very easy to setup and look better from outside your house. The catch is that they take up a bit more floor room.

For reference, a typical computer system would generate between 314-1500btu/hr. (including monitors) A person sitting is approx 150-200 btu/hr. The rest is the heat from the environment.

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Old 06-06-2015, 01:33 PM   #6
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Or a mini split ! :-)

God bless


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