I am currently keeping my room around 75 degrees and my 40w and 80w panels do not even use 40% power to achieve a 88-90 degree hot spot. I use 4'x36"x18" boamasters. Last year, the ambient room temp was around 70 degrees and I don't think it had to use more than 50% power unless it was reheating after being opened. I use herpstat thermostats that tell me the % when used on pro.
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