I just got back from the LFS, as I wanted to see how much power his dehumidifiers pulled. Each one used around 750w of power, or 7.5 amps. :eek2: :eek2: I couldn't believe it. My window a/c unit pulls 800w / 8 amps. At this point, I don't see the benefit of adding one, from a monetary standpoint. I think the vent fan in the ceiling is the route I'll end up going.
The fishroom is in the garage area, which formerly was abutting to the livingroom and dining area walls. I walled it off two years ago, with sheetrock on both sides and insulation within the new walls.
Your suggestion that I lower the a/c to 72F or 70F would make the reef too cold, and I'd have to run heaters to compensate. Call me cheap if you like, but with my current electric bill at $480 and this being the hottest month of the year (in Texas, typically), I'm not willing to pay the extra for that test.
I have to say, it is quite tempting to extend the fish room wall out 3' all the way across, including the doorway. That would reduce the area in the garage further, and make the fish room 7 x 10 x 8 / 560 cubic feet. The benefit is a little more space to work in there, and I could have top off and mixing vats in the same room on a permanent basis. Not having saltwater mixing in the kitchen is very appealing, when you consider that I'm mixing up 55g in a big drum on a regular basis. Water temperature in the barrel would be virtually the same as the reef tank, as well as pH.
The house uses a central A/C unit, and I'm keeping that at 77F now. With our humidity, it is right on the edge of being uncomfortable. Fans help substantially. The reef tank isn't sealed off from the house since there is no woodwork.
For now, I'm just thinking out loud. No solid decisions are being made yet.