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A-frame advantage Artificial light attached Automatic controls available for greenhouse B.t.u.'s per hour build carbon dioxide clock coldframe construction cool cost courtesy of J. A. cross rafters curved eaves ducts are suspended eave height electric heat evaporative cooler even-span greenhouse exhaust fans Fahrenheit feet wide fiberglass foot candles free-standing greenhouse gardener glass or plastic green grow tall plants heating equipment heating system hobby greenhouse hotbed humidity inches inner layer inside installed kerosene layer of plastic lean-to greenhouse lene length light meters Lord & Burnham MIST PROPAGATION CONTROLS multiply needed number of square panels perature Photo courtesy plant benches plant growth Plastic greenhouses prefabricated glass greenhouse require roof vents sash bar side benches side walls sidewalls soil solenoid Space heaters square foot structure sulfur tape or cable temperature temperature difference thermostat tion Tri-Penta Greenhouse tube tural TYPES OF GREENHOUSES Ultraviolet light ventilation widths window-mounted