Estimate BTU output needed to heat a greenhouse.
A rough greenhouse heat load scales with the floor area and the temperature difference between inside and outside, times an insulation factor. The right heater keeps plants above their cold threshold on the coldest nights without overspending on oversized equipment.
Greenhouse Heating
BTU/hr ≈ floor area x 60 x temperature difference
BTU/hr ≈ floor area x 60 x temperature difference A rough greenhouse heat load scales with the floor area and the temperature difference between inside and outside, times an insulation factor.
The right heater keeps plants above their cold threshold on the coldest nights without overspending on oversized equipment.
This calculator takes 2 inputs: Floor area, Temperature rise needed. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.