Furnace BTU Calculator
Calculate heating requirements for your home
Home Specifications
Heating Requirements
BTU Required
0
British Thermal Units per hour
Furnace Size:
BTU per Sq Ft:0.0
Note: This is an estimate. Consult an HVAC professional for precise sizing based on heat loss calculations, ductwork, and local codes.
Climate Zone Guide
Zone 1-2 (Hot)
South Florida, Hawaii - 30-40 BTU/sqft
Zone 3-4 (Moderate)
Southern US - 40-50 BTU/sqft
Zone 5-6 (Cold)
Northern US - 50-60 BTU/sqft
Zone 7 (Very Cold)
Northern Border - 60-70 BTU/sqft
Learn More
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