Thermal Engineering • Winter Frost Protection
Greenhouse Winter Heater BTU Calculator
Determine the exact BTU heating capacity and electrical wattage needed to protect your seedlings, citrus, and vegetables from freezing temperatures.
50°F is standard for wintering
Coldest anticipated winter night
Required Heating Output
--BTU / hr
--Electric Heater Wattage:-- Watts
Total Surface Area:-- sq. ft.
💡 Thermal Efficiency Tip
Adding horticultural bubble wrap or thermal night blankets against the north wall cuts heat loss by 25% to 35%, allowing you to use a significantly smaller heater.