I need to replace my electric forced air furnace with a propane forced air furnace. I used several calculators online and ranged between 50-65k btu/hr for heating. These calculators just asked for region and square footage. I used two different online manual j calculators and spent a great deal of time to make sure I was precise (windows, walls, r-values, ceiling height, etc.) I actually measured all of these things. Both Manual J calculations came out to a max heat output of approx. 35k btu's. I am looking at getting a 96% furnace and can't decide between a 40k or a 60k furnace. The 40 sounds right according to the manual j, but about 5-6 different online calculators said approx. 60k. Thoughts?
House is 1600 sq ft, single story, low ceilings, brand new windows, unconditioned crawlspace, approx. r11 walls and r 21 attic. I live on the coast near Seattle,
House is 1600 sq ft, single story, low ceilings, brand new windows, unconditioned crawlspace, approx. r11 walls and r 21 attic. I live on the coast near Seattle,
source https://hvac-talk.com/vbb/showthread.php?2222168-Gas-furnace-sizing-Manual-J-vs-Online-calculators&goto=newpost
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