I would not vent it to the outside of the house. I think you would loose too much heat. As far as heating goes if you use a small electric heater inside with a fan it could be connected to a thermistat set to the lowest exceptable temperature. Be sure to heat from the bottom since heat rises. The lights that you use will warm up the growing area during the day. You may need to use another thermistat to bring in cool air if it gets too hot.
About humidity, it might take care of itself. I would set the plants up in it first and monitor the humidity over about a week or two with a min-max humidity meter checked daily.
Last edited by trdyl; 10-24-2009 at 10:51 AM..
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