Close
Furnace Size Selection Guide
Furnace Output [BTU] Required
Bungalow
Built after year 1980
Built before year 1980
Up to 1,200 sq ft
40,000 BTU
50,000 BTU
1,200 to 1,500 sq ft
50,000 BTU
55,000 BTU
1,500 to 1,800 sq ft
55,000 BTU
60,000 BTU
1,800 to 2,500 sq ft
65,000 BTU
70,000 BTU
2,500 to 3,500 sq ft
80,000 to 90,000 BTU
90,000 to 100,000 BTU
Semi-Detached 2-Storey Home
Built after year 1980
Built before year 1980
Up to 1,500 sq ft
40,000 BTU
50,000 BTU
1,500 to 1,800 sq ft
50,000 BTU
55,000 BTU
1,800 to 2,200 sq ft
55,000 BTU
60,000 BTU
2,200 to 3,000 sq ft
60,000 BTU
70,000 BTU
Detached 2-Storey Home
Built after year 1980
Built before year 1980
Up to 1,300 sq ft
40,000 BTU
50,000 BTU
1,300 to 1,700 sq ft
45,000 BTU
up to 55,000 BTU
1,700 to 2,500 sq ft
55,000 BTU
Up to 65,000 BTU
2,500 to 3,500 sq ft
Up to 65,000 BTU
Up to 80,000 BTU
3,500 to 4,500 sq ft
Up to 80,000 BTU
Up to 100,000 BTU
*The above square footage do not include the area of the basement.
Please note that, installing an over-sized furnace will be less efficient, too noisy and will result in imbalanced temperature around the house. Also, an over-sized furnace will run in shorter cycles, hence reducing furnace life.
Close