furnace size

corzy

K guys ive got one of those fancy 2 stage 90% efficient keepright furnaces, but only run on hi stage that is 50 000 btu, and dont use a dc motor for the fan, so its on full blast all the time anyways...
right now were heating our small converted cottage (under 800' main floor) and 2 story over half (under 400 sq) in my un professional shade tree mechanic/house DIY contractor its way over powered since when it comes on it blows the roof off...my question is how big of an area can these furnaces heat? were planning on adding an addition and just seeing if we need to upgrade or if we will be alright?
just FYI i ran all the ductwork in our crawlspace (all 17" of it) i hung it from the floor joists and it runs in the horizontal setup, it can be ran in 4 different positions...
thanks for any info guys

corzy

i guess i should add what we plan to do for our addition...the additon will be 400 sq foot main, with 2nd story over it...the existing house will be converted to entirely 2 story.
thanks

beenthere

Moved to HVAC forum.

beenthere

Even 2 stage furnaces with standard blowers run on a lower speed in first stage. It may not be set up right.

How big of a house it can heat, depends on how well built the house is.

corzy

haha ok.
its a converted cottage so its a pile....but we had extra insulation pumped into the walls so its pretty sound, the new construction will obviously be much better with 2/6 construction, however due to being on the lake my wife will be insisting that the entire north facing walls will be windows haha
so any guesses? right now it heats the place up pretty quickly.
like i said before since it isn't running on the dc motor things were wired differently so it comes on strong right off the bat. not really sure why you would want the fan to only come on slowly at the beginning anyways.

Missouri Bound

Your location, window size, type and placement, insulation, wall thickness, house orientation, floor plan, ETC. ETC. ETC. So many variables. You may as well use this.


ACME air conditioning calculator

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