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What size furnace do I need?

The size of the furnace you’ll need largely depends on the size of your home. Size recommendations based on square footage are:

1,200 square foot home: 36,000 to 72,000 BTUs
1,500 square foot home: 45,000 to 90,000 BTUs
1,800 square foot home: 54,000 to 108,000 BTUs
2,100 square foot home: 63,000 to 126,000 BTUs
2,400 square foot home: 72,000 to 144,000 BTUs

Other factors that affect the size of the new furnace installation you’ll need include:

  • Climate zone (for example, Edmonton is in Climate Zone 5)
  • Quality of insulation
  • Window thickness
  • Ceiling height
  • Number of people living in your home
  • Preferred temperature
  • Size and state of the basement

For more info om furnace shopping, read our full article on “how to choose the right furnace“.