At 10°F, you have one hour from the time your greenhouse heaters fail until critical damage occurs to your crop. Even if repairs are made, the salvaged plants may not be profitable. Gas and oil-fired unit heaters are the most common type found in smaller greenhouses. The heaters can be maintained by the owner or a reliable staff person with some basic skill training. Your attention to heating equipment details can make a major difference in your annual bottom line.
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