[Community_garden] winter greenhouse heating

[Judith Hainaut]

Naomi,
I have a greenhouse too - attached to my house.  I tried an electric heater but it was much too expensive.  I plan on putting a thermal barrier in the floor and then radiant hot water heating and then paving, will insulate the knee wall with insulation board and then put polycarbonate sheets inside the glass with an airspace.  Perhaps yours will be easier but that's my plan so far.
Judy
Pontiac, MI
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