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Old 11-22-2014, 09:02 AM   #1
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40000 btu for 500 sq


Hi. I'd like to upgrade from electric heat to gas.
I have 40000 btu single stage 800 cfm gas furnance. Can I use it for apartment approximately 500 sq. feet?

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Old 11-22-2014, 09:06 AM   #2
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40000 btu for 500 sq


Do you have an electric furnace now,

You need ductwork and a gas line.

Depending where you live and how drafty the apartment is it may be the right size of it may be too big.

http://www.hvaccomputer.com/gtarget1...Fe4-MgodPF4AoQ

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Old 11-22-2014, 09:43 AM   #3
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40000 btu for 500 sq


Too big. I'm in Manitoba and we get quite cold. I heat a 2000sq foot house with an electric furnace. It's 11,000 watts (roughly equivalent to 40,000 btu). Granted I do have a couple of small 500 watt baseboard heaters on the second floor.
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Old 11-22-2014, 09:47 AM   #4
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40000 btu for 500 sq


It will short cycle, but you can use it.
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Old 11-22-2014, 09:54 AM   #5
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40000 btu for 500 sq


Thank You all.
I live in Staten Island NY.
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Old 11-22-2014, 09:58 AM   #6
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40000 btu for 500 sq


Gas will be completed by licensed contractor. Duct work will do my self.
Plan is for one 8 inch round supply, 3 separate 6 inch round supply lines and 16x16 return.
I hope that will work.
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Old 11-22-2014, 09:59 AM   #7
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40000 btu for 500 sq


1-8" round supply will end up giving you no heat.
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Old 11-22-2014, 10:01 AM   #8
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40000 btu for 500 sq


A 40,000 BTU input 80 percent furnace should have a 12" round supply if you want to be able to hear while its running. Same with return.
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Old 11-22-2014, 10:08 AM   #9
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40000 btu for 500 sq


Thank You. I'll do bigger supply lines.
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Old 11-22-2014, 10:12 AM   #10
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40000 btu for 500 sq


A 12" round trunk line, or 8X14 rectangular trunk. And 3-7" supplies and 1-6" supply would work okay.
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Old 11-22-2014, 10:12 AM   #11
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40000 btu for 500 sq


Is short cycling big problem?
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Old 11-22-2014, 10:21 AM   #12
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40000 btu for 500 sq


It can wear out parts quicker. Cause you to feel cold as soon as the furnace shuts off, and can use an excessive amount of gas.
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Old 11-22-2014, 10:22 AM   #13
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Thank You.
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Old 11-23-2014, 08:28 PM   #14
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I'd go with a gas fireplace for 500 sq feet.
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Old 11-23-2014, 11:20 PM   #15
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40000 btu for 500 sq


For such a small space have you considered a 1 ton mini-split heatpump? (or maybe 1.5 ton with 2 9000 BTU heads)

Today's variable speed mini-splits can heat down to -20c/-4F or lower and use 1/3rd-1/2 the energy of baseboards for the same amount of heat.

Even 40 000 BTUs is far too large. If you're set on a furnace, get a 2 stage 40 000 BTU and lock out high fire.

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