A furnace with an input btu of 100 000 and an efficiency of 80 percent would be a perfect fit because 80 percent of 100 000 btu is 80 000 btu.
													
																	80000 btu electric furnace. 
									
	
		
	
																	The average furnace has a btu rating of 80 000 to 100 000 btus. 
																	Goodman gmh80803bn 80 000 btu furnace 80 efficiency 2 stage burner 1 200 cfm multi speed blower upflow horizontal flow application. 
																	Goodman gmh80805cn gas furnace two stage burner multi speed blower upflow horizontal 80 000 btu 4 0 out of 5 stars 1 goodman gmss920803bn single speed 1 stage upflow horizontal low nox gas furnace with 17 1 2 92 afue 80 000 btu 1 200 cfm. 
																	Whether you live in new england the upper plains or in a house with less than ideal insulation you need a furnace that can really bring the heat. 
															
													
									
	
		
	
																	The btu refers to the heat output the furnace creates. 
																	Wholesale furnaces buying guide. 
																	You ll want to look at a unit s btu as well as its efficiency. 
																	A furnace with 100 000 btu and an efficiency of 90 delivers 90 000 btus of heat to a home the remaining 10 is what is lost through the flue. 
															
													
									
	
		
	
																	Gas furnaces use gas to heat your home.