Furnace Size Calculator - BTU Home Heating Estimator
Calculate your ideal furnace size with our BTU calculator. Get precise heating requirements based on square footage, climate zone, and insulation for maximum efficiency.
Furnace Size Estimator
sq ft
Recommended Furnace Size
Your recommended furnace size is:
0 BTU (0 BTU - 0 BTU)
Calculation Method
Base: 1500 sq ft × 35 BTU/sq ft
Adjustment factors applied:
Insulation quality: ×1.00
Ceiling height (8ft): ×1.00
Home age: ×1.00
BTU Contribution Breakdown
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Documentation
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