Easy to install, completely automatic, an electric heater is ideal for the small hobby greenhouse or for a cool compartment in a larger partitioned greenhouse. The electric heater is placed under the bench at one end of the greenhouse but angled to blow heat the entire length of the structure. The heater should have a built-in circulation fan to distribute warm air evenly throughout the greenhouse. A thermostat with a range of 40 to 80 F and a separate heavy-duty electric line are necessary; heater and thermostats should be installed at the time of greenhouse erection in accordance with local electric codes.