Heating and hot water
We’re empty nesters building a new home. I’d like to bounce some ideas off of you and looking for suggestions.
Current home, 2000ft2 20yr tract home. gas forced air heat. SE exposure & we let the sun in. Current usage: 3494kwh/yr electric, 9317 kwh/yr gas. I think we’re pretty frugal with our energy consumption, we keep the stat set low during the day, and essentially off at night.
New home will be in central CO, plenty of sun. 6939 htg deg days (about the same as current location). Average low in Jan is 12.4F. AC is not needed.
Rates at new home will be $0.0866/kwh for electric and $0.0214/kwh for gas.
New house will be about 2000 SF 1 story on slab. Good southern exposure and will be suntempered with about 7% glass on south side. It will be well insulated and tight, but not passivehouse levels. The 10-20-40-60 R levels I read here sound reasonable.
I’ve pretty much decided to install rooftop PV to offset my electric consumption.
I’m strongly leaning toward hot water baseboard heat. I don’t see the value in in-floor heat except in bathrooms. Most of our heating consumption will be early morning when we wake up and turn up the heat to 62F, at least that seems to be the case today.
I’ve been thinking about trying to go net 0 by adding more PV and electric heat and hot water, but with Nat gas being so much cheaper than electric, I’m not sure I can economically justify it. I showed a picture of a minisplit heater to my wife and she said no way.
Maybe a heat pump water heater? Do they make them big enough for hydronic heat? It would be either in the garage, or in a ventilated mech room in the garage. Since quite a bit of the demand will be when it’s very cold outside it seems the COP will be pretty low.
I’ve haven’t run the numbers yet on solar hydronic, but the articles I’ve read here and elsewhere make it sound pretty uneconomical.
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