Hi Doax,
I wish I had some hard data to go off of, but I haven't really had a chance yet. Maybe that's something I could spend a sunny afternoon logging the temp rise. Circumstantially, the renter mentioned on on sunny days the apartment would get pretty toasty, and on one day with outdoor temps around the low 70s it got around 78 inside. I think this pretty consistent with the 5 or so degree rise I've seen from the heater. I want to put up another hot air panel this summer, so I'll have records to compare what that does.
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