Last year, we turned on our air conditioner twice. At times it was a little hot and sticky (here in the Boise, Idaho area it tops 95° pretty much every day in full-on summer), but in general, Daniel and I acclimated to it pretty well and didn’t mind much.
Other people… well, that is a bit trickier. My sister lives with us, and her boyfriend often spends Friday and Saturday nights here (on the couch!), and they were both extremely uncomfortable last summer. I felt kind of bad about it, but we offered to let them run the A/C and pay for the additional cost, and that didn’t go over so well.
This year, I’m working from home (not in a building air-conditioned to about “frigid”), and I’d like to figure out a happy medium—something that will keep the fam happy and still keep the bills reasonable. I think that a big part of this will just be to actually get up and close the windows when it gets hotter outside than inside (I love fresh air, but it’s sensible to keep the fresh air limited to the night and morning hours in this case).
What I’m really wondering about is air conditioner efficiency. For instance, right now it’s 87° outside and 82° inside, so only a 5° spread. I can’t image it would cost much to keep it 5° cooler inside (vs. outside). But what about days when it’s 100°? I’d like to know what kind of curve the air conditioner efficiency has as related to inside-outside temperature differences. For instance, if it costs, say, a dollar per hour to cool the house to 10° below the outside temperature, but $2/hour to get °15 lower, that would be worth knowing. (I’m sure those per-hour numbers are way off, but you get what I’m saying, right?)
Another thing is that I saw this “Cool-n-Save” gizmo. It seems pretty smart; it cools the A/C unit itself with evaporation. A study showed it cut the cost of air conditioning by up to 30%. However, I don’t know how much the air conditioner costs to operate, so I’m not sure whether the Cool-n-Save is worth $80—the break-even point would be when the air conditioner has accrued a cost of $267. I’d be surprised if we use that much, just because if we get next month’s bill and it’s about $80 (and the others who benefit from A/C opt not to contribute), I’d expect it to pretty well stop.
The truly aggravating thing about this is that I feel completely uninformed. I don’t know the best way to use my air conditioner, and that annoys me. So please, by all means, enlighten me! If you don’t know anything about air conditioner efficiency, no worries: I mostly want to know how other people handle the cost/comfort balance. What do you do in the summer?
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