Lenny; With an 8" system in a greenhouse , I seem to average 100-120 at the hot end and 80-90 at the far end . If I burn hot all day I see 130-140 and 90-110 . In an insulated house it would be more.
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You ought to ventilate your mind and let the cobwebs out of it. Use this cup to catch the tiny ads:
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