BTU Charts

Furnace Output and Air Conditioner size for a Bungalow
Bungalow Area
[sq ft]*
Furnace Output [BTU/hr] Air Conditioner size [ton]
Built after year 1980 Built before year 1980 Built after year 1980 Built before year 1980
up to 1200 sq ft
40,000 BTU/hr
50,000 BTU/hr
1.5 ton
up to 2 ton
1200 to 1500 sq ft
50,000 BTU/hr
55,000 BTU/hr
2 ton
2 ton
1500 to 1800 sq ft
55,000 BTU/hr
60,000 BTU/hr
2 ton
up to 2.5 ton
1800 to 2500 sq ft
65,000 BTU/hr
70,000 BTU/hr
up to 2.5 ton
2.5 to 3 ton
2500 to 3500 sq ft
80,000 to 90,000 BTU/hr
90,000 to 100,000 BTU/hr
3 to 3.5 ton
3.5 to 4 ton
* The above square footages do not include the area of the basement.
Furnace and Air Conditioner size for a semi-detached 2-storey home
Semi-detached Area
[sq ft]*
Furnace Output [BTU/hr]
Air Conditioner size [ton]
Built after year 1980
Built before year 1980
Built after year 1980
Built before year 1980
up to 1500 sq ft
40,000 BTU/hr
50,000 BTU/hr
1.5 ton
up to 2 ton
1500 to 1800 sq ft
50,000 BTU/hr
55,000 BTU/hr
up to 2 ton
2 ton
1800 to 2200 sq ft
55,000 BTU/hr
60,000 BTU/hr
2 ton
up to 2.5 ton
2200 to 3000 sq ft
60,000 BTU/hr
70,000 BTU/hr
2.5 ton
2.5 to 3 ton
*The above square footages do not include the area of the basement.
Furnace and Air Conditioner size for a detached 2-storey home
Detached Home Area
[sq ft]*
Furnace Output [BTU/hr]
Air Conditioner size [ton]
Built after year 1980
Built before year 1980
Built after year 1980
Built before year 1980
up to 1300 sq ft
40,000 BTU/hr
50,000 BTU/hr
1.5 ton
up to 2 ton
1300 to 1700 sq ft
45,000 BTU/hr
up to 55,000 BTU/hr
1.5 ton
2 ton
1700 to 2500 sq ft
55,000 BTU/hr
up to 65,000 BTU/hr
2 to 2.5 ton
2.5 ton
2500 to 3500 sq ft
up to 65,000 BTU/hr
up to 80,000 BTU/hr
2.5 to 3 ton
3 to 3.5 ton
3500 to 4500 sq ft
up to 80,000 BTU/hr
up to 100,000 BTU/hr
3.5 to 4 ton
4 to 5 ton
*The above square footages do not include the area of the basement