Different types of heating

Oil Heat

A forced-air oil heater is inexpensive. If you need heat in your greenhouse but a few times during the year, one of these fan-type heaters may be just the thing for you. The fan forces a brisk circulation of hot air through ducts running underneath plant benches. You can pipe the smoke out through a chimney or through pipes running under the bench and vented out one end of the greenhouse. This pipe surface gives off added heat and removes the necessity of a chimney stack.

Gas Heat

Many owners of profit-making greenhouses live in areas where natural gas is available. A natural gas unit is quite reasonable in cost. One low-priced heater is all-aluminum and about 12 inches in diameter and 22 inches high. A somewhat larger heater, 15 inches in diameter and 25 inches high, naturally is about double the price. This type of heater is set under the side benches so that heat goes out into the walk. It is vented and piped into the outer gutter or directly outdoors. These heaters are not recommended for use with fuels such as Butane or Propane.

Electric Heat

Where the cost of electric current is low, it might be feasible for you to heat with electricity. The heating coils are the same as those used for soil-heating cables. These coils are wound around -inch pipe which is run around the inside of the greenhouse. A thermostat controls the heat.

Automatic Temperature Alarm

An automatic temperature alarm-a thermometer hooked up to a bell-is good crop insurance. An unexpected cold night, failure of electricity, or trouble with your heating system might cause you to lose an entire crop. So that a power failure will not affect it, the alarm operates on batteries or dry cells. When greenhouse temperature drops below a pre-set mark, the thermometer actuates the bell. The bell for our greenhouse alarm is placed just outside our bedroom door. Thus we are able to hear it even in the noisiest stormy night.

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