Greenhouse Heating Calculator
Greenhouse BTU Requirement
Calculate heating BTUs needed for your greenhouse
Formula
BTU/hr = Surface Area (sq ft) × U-value × ΔT (°F)
Frequently Asked Questions
How do I calculate greenhouse heating needs?
Multiply the total surface area of the greenhouse by the U-value of the glazing material and the temperature difference between inside and outside. This gives BTU per hour needed.
What temperature should a greenhouse be kept at?
Most plants thrive at 55-75°F. Cool-season crops can handle 45-55°F at night. Tropical plants need 60-70°F minimum. The key is to avoid freezing (32°F).
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