Furnace Size & BTU Calculator
Furnace Sizing & BTU Calculator
This short quiz is designed to help Canadian homeowners estimate the correct furnace size and BTU output for their house.
Why Furnace Size Is So Important
Oversized Furnaces
Undersized Furnaces
Furnace Size Can Maximize Energy Efficiency
How Furnace Size is Measured
Furnace Sizing Starts with Square Footage
You can use how many BTU per SF as a starting point. From there, however, there are plenty of other things that can impact the size furnace you need, including:
Factors Other Than Square Footage that Impact Furnace Size
Climate
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How soon are you looking to buy?*
Home Style, Layout, and Orientation
Home Insulation
Windows and Doors
Additional Heat Sources
Ductwork
Exterior Walls
Furnace AFUE (its energy efficiency rating)
BTU Per Square Foot: How to Estimate Furnace Size Based on Square Footage
Calculating Furnace Size for Different Climate Zones
Determine Which Climate Zone You Live In
Square Footage | Furnaces Size for Mild Climates (30) | Furnace Size for Moderate Climates (45) | Furnace Size for Cold Climates (60) |
---|---|---|---|
1,000 | 30,000 BTUs | 45,000 BTUs | 60,000 BTUs |
1,200 | 36,000 BTUs | 54,000 BTUs | 72,000 BTUs |
1,500 | 45,000 BTUs | 67,500 BTUs | 90,000 BTUs |
1,800 | 54,000 BTUs | 81,000 BTUs | 108,000 BTUs |
2,000 | 60,000 BTUs | 90,000 BTUs | 120,000 BTUs |
2,200 | 66,000 BTUs | 99,000 BTUs | 132,000 BTUs |
2,500 | 75,000 BTUs | 112,500 BTUs | 150,000 BTUs |
2,800 | 84,000 BTUs | 126,000 BTUs | 168,000 BTUs |
3,000 | 90,000 BTUs | 135,000 BTUs | 180,000 BTUs |
Getting a Furnace Professionally Sized
10 Common Mistakes to Avoid in DIY Furnace Sizing
Sizing Considerations for Vacation Homes or Seasonal Properties
Expert Insights: Tips from HVAC Professionals on Furnace Sizing
FAQ
What is BTU in furnace calculations?
Can a furnace be too big for a house?
Does Furnace Size Affect Air Conditioning?
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