Adding a small heater to a greenhouse in October can rescue a sativa that needs three more weeks when the nights start dropping below freezing. Even a modest electric fan heater on a thermostat set to eight degrees keeps the plants alive and ripening without any attempt to make the space warm. The greenhouse notes on https://hazesativaseeds.com calculate rough running costs for a few common sizes and suggest bubble wrap insulation to keep the bill reasonable. Running a dehumidifier alongside it matters just as much, since warm humid air in a closed greenhouse invites rot.
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