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-   -   how much difference does furnace size make (http://www.diychatroom.com/f17/how-much-difference-does-furnace-size-make-80440/)

chaley 09-03-2010 10:45 AM

how much difference does furnace size make
 
I have 4 different contractors and 4 different answers.

How much difference is there if I choose a 70000 btu or a 90000 btu?
I already threw out the high (100000) and the low (60000).

Scuba_Dave 09-03-2010 12:02 PM

The size should be based on a heat loss calc
Insulation, windows, your location all have an effect on sizing

beenthere 09-03-2010 08:33 PM

You can do your own load calc. http://hvaccomputer.com/talkref.asp well worth the 49 bucks to use it.

The 60,000 may indeed have been the right size.

An oversized furnace on undersized duct work. means higher then needed heating bills. And possible service problems, keeping it running.

yuri 09-03-2010 09:29 PM

An oversized furnace will have chronic overheating problems/run too hot/ride the limit control and will have an expensive premature heat exchanger failure.:yes:


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