Greenhouse Heating Calculator
Calculate BTU heating requirements for a greenhouse based on glazing, dimensions, and temperature differential.
Inputs
ft
ft
ft
°F
°F
Results
Heating Load
201,692 BTU/hr
Daily Heat Requirement4,840,609 BTU/day
Total Surface Area5,457 sq ft
Floor Area2,880 sq ft
Natural Gas48.41 therms/day
Propane52.9 gal/day
Electric Heat1,418.7 kWh/day
How to Use This Calculator
- Enter your greenhouse dimensions (length, width, sidewall height in feet) and select the glazing type — double poly has the best insulation for the cost.
- Enter your desired inside temperature (°F) and the coldest expected outside design temperature for your location.
- Set the wind exposure factor: 1.0 for a sheltered site, 1.2 for moderate exposure, 1.5 for open/exposed locations.
- Review the Heating Load (BTU/hr) — this is the peak output your heater must provide on the coldest night.
- Compare Natural Gas (therms/day), Propane (gal/day), and Electric Heat (kWh/day) to choose the most economical fuel source.
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