You Can Build Your Own Add-On Greenhouse
(Page 7 of 7)
January/February 1978
By the Mother Earth News editors
The next step up is to artificially heat the conservatory on a "once in a while" basis merely by opening a large door or doors between the lean-to and the house to which it is attached. This works both ways, of course: On cold but sunny days, excess heat from the conservatory will flow into the house and help to heat it ... while, on cold nights, some of the warmth from the building's heating system can be allowed to flow the other way. You can even refine this idea somewhat by extending one of your regular furnace ducts right into the greenhouse.
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If you're really determined to operate your addon conservatory as a fully heated "hothouse", though, there's no way around it: You'll just have to figure on equipping the greenhouse with a heating system of its own. Check local gas, oil, and electric rates and/or price out a wood-burning furnace ... and make your choice based on original cost of the setup, availability of fuel, ongoing operating expenses, ease of operation, and whatever other factors you find pertinent. Consult local codes and a knowledgeable dealer in greenhouse equipment for the facts and figures most applicable to your particular situation.
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