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We have a relatively small dome style gh that we bough from Shelter Systems many years ago. We set it up on our deck each winter and had been using 2 or 3 150 watt bulbs to keep it above freezing when needed (we're zone 7b... not too many prolonged frigid spells).
Lately however I've been wondering whether we should use a small space heater instead of the lights. I've seen some that say anti-tip (sounds useful, although there's no reason why it would tip over once the GH is closed.) Also, I've seen some that say "anti-frost" indicating that they'd only come on when the temp falls below a certain point. But the ones that I've seen say that they'd come on at 45 degrees, while I'd prefer them to not come on unless the temp dips a bit further (38 or 40). I'm not really trying to get anything to grow in the GH. Mostly it's just to keep some plants alive for the winter months.
Any ideas? advice?
thx-
jo
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