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Furnace sizing tool

Estimate a furnace output range from home size, climate and insulation.

Home sizeEnter your home's conditioned area (square feet).sq ft

Climate zoneYour location helps us estimate heating needs.

Insulation levelHow would you describe your home's insulation?

Where heat is lost

Heat escapes through the building envelope. A larger loss requires more heating capacity.

These are typical paths. Actual losses depend on your home and climate.

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HVAC Judge provides general information and planning estimates, not a diagnosis, installation design, warranty decision, or contractor quote. Check equipment details with the manufacturer and use a qualified HVAC professional before repair, replacement, or installation.