Depends on manufacturer recommendation; read the box or brochure for the furnaces you are considering.
I would say a 40,000 BTU furnace could big enough to heat a 400 SQ ft house, but where have you found a 400 SQ Ft house?
2500sq ft in northern climate
80000
I strongly urge you to call a pro HVAC company and have them perform a manual J load calculation . However for years ,typically 75,000 to 100,000 btu furnaces in the south USA were the norm. Tom H. HVAC proffesional, New Orleans
rooms are 325 sq ft and suites are 625 sq ft
No, despite that people will understand what you have written. But still 3 ft sq is not same as 3 sq ft.
21 ft * 10 ft = 210 sq ft = 19.51 sq metres.
A 60,000 BTU/hr. furnace will heat a 1400 square foot house. However, the average daily temperature, house insulation and other factors will have to be considered before making a final decision.
You cannot accurately determine what size furnace is required based on the total square feet of a given space or structure. To accurately determine how much heat is required to heat your, you would need to have a Manual J Heat Load Calculation performed.
Alaska 200k btu fla 50k where you at?
0.048209 acres.