Greenhouse Heaters & Grow Room Heating for Indoor Cultivation
Maintaining minimum temperature thresholds in growing spaces during cold weather is as important as managing heat in summer. Plants experiencing temperature stress below their optimal range slow growth, halt nutrient uptake, and become susceptible to root disease and cold-weather pathogen pressure. A properly sized greenhouse heater maintains the temperature floor your crop needs regardless of outdoor conditions.
Propane, Natural Gas & Electric Greenhouse Heaters
Propane and natural gas unit heaters are the most cost-effective option for larger greenhouses and commercial growing spaces where heating demand is substantial — fuel-fired heaters produce more BTUs per dollar of operating cost than electric resistance heating at most utility rates. Electric heaters are practical for smaller grow rooms and tents where installation of gas lines is impractical, and for supplemental zone heating in spaces that are primarily climate-controlled by other equipment. Infrared heaters warm surfaces and plants directly rather than heating air — efficient in drafty or high-ceiling spaces where convective heating loses effectiveness. Fan-forced heaters distribute heat evenly through a growing space via a built-in blower.
Sizing a Greenhouse Heater
Heater sizing is driven by the heat loss rate of your structure — how fast the space loses heat to the outdoor environment through walls, glazing, and infiltration. A well-insulated indoor grow room loses heat much more slowly than a glazed greenhouse in the same outdoor temperature. Calculate your space volume, insulation value, and the temperature differential between your setpoint and the coldest expected outdoor temperature. As a rough starting point, a single-layer plastic greenhouse in a 20°F outdoor temperature needs approximately 1 BTU/hr per cubic foot of greenhouse volume to maintain 65°F inside. Use our BTU Calculator as a starting point for grow room heat load calculations.
Pair with a temperature controller for automated on/off management, explore grow room air conditioners with heat pump capability for both heating and cooling, or browse all environmental control equipment. Expert support available.
