AC vs heating

99.6 °F in the shade at 2pm. Hotter here in MA than in FL today. Our house reports that it is expecting to use $1 worth of electricity today to keep cool by midnight. We’ll see how well the eMonitor guesses. (Well, $0 really if you count the PVs). But I *try* not to think of the PVs as an excuse to be extravagant.

And this kind of temperature is relatively rare here. Point being, I reckon our AC bill for a year will probably average 1/5 or 1/6 of our heating bill. Or something to that effect. So I can’t personally get too upset about that.

Aside: This is also the time of year when northern honeowners who wisely choose windows with a high SHGC (solar heat gain coefficient) are using a bit more in AC. But it will be offset by their greater savings in winter-time heating.

Sometime I will run a few informal experiments using a standalone dehumidifier instead of (or in addition to) the minisplit AC since sometimes it’s really the humidity (8 people in the house!), not the temperature. Though it definitely is sometimes both.

UPDATE: Actually eMonitor is saying 37 cents (3:30pm) and 16 cents more to go. So that would be 53 cents, not $1. (I have my settings set to $0.15/KWh since last I checked that is relatively close to what we actually pay Hudson Light and Power when you divide out at the end of the month)
So that would be 0.53/0.15 = 3.5 KWh for ONE 100F DAY. Versus, we probably use that much in 2 hours on a very cold day (0F).

See also:
– Here: Erik’s Blog: Latent vs Sensible Loads
– The New Yorker: an article about the rebound effect and the Jevons Paradox
David Owen, Annals of Environmentalism, “The Efficiency Dilemma,” The New Yorker, December 20, 2010, p. 78

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