Oddly enough last year through the winter I couldn't get my basement temp above 68 degrees and that was with TWO 1500 watt heaters going. I had an electrician friend come in and wire in a 220 volt circuit just for heating my aquarium room. I gave up on 65 tanks because I would have had to had a seperate heater in every tank.... $$$$$... Now I have a 400 watt MH and between the lamp and the ballast my room hits 82 degrees during the day, and doesn't drop below 72 at night, and I don't still have the heaters on.
I was shocked to find out a MH lamp and ballast make a more efficient space heater than ... well.. space heaters do...
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