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So avg. 317kWh/month? I'm trying to remember, is all of your heating via the mini-splits? We come in at about 366kWh/month avg, but that's with gas heat - and a very old house. :)

David White

Hooray Marc!

Marc Rosenbaum

Yes, 317 kWh/month average, and it's an all-electric house now, so monthly usage has ranged from about 200 kWh to 500 kWh, and in a colder winter I expect the monthly usage could go to 600 kWh or more.

Bob Lemaire

So if I read this correctly, your achievement of both the THC and PH standards (existing and proposed) is exclusive of the PV component (which gets you to net sub-zero). That is amazing given that the house was not anything real special to begin with and the envelope improvements were relatively minor.

I think further discounting SE by the immediately useable PV energy as you suggested in the regional PH proposal is as legitimate as the baked in effect of any other solar mechanism like increased glazing, daylighting, or solar thermal.

You approach is scalable for a lot of homes in the northeast.

Marc Rosenbaum

Yes, this energy usage is not counting the net zero aspect of the PVs. I don't want to brag about this - we're a conserving household of two, and this was an unusually mild winter. The scalability has to do with choices to use less, and machines that out the energy right where you need it, and efficient appliances and lighting. But the big nut for most houses is the heating load, and I started with a better than average house.


Very impressive Marc. Here I thought we were a conserving family of 4, but you've put me to shame. Now I'm wondering, can I live without the ultra-efficient beer fridge? :)

(Aside: do you ever need dehumidification in the basement? Or does your geyser system take care of that?)

Marc Rosenbaum

Eric - I think we're conserving partially by inclination, partially by being at work too much :-), partially because for relaxation we read instead of watch TV (we don't have one), and certainly because we're two rather than four people. We haven't been using a dehumidifier in the basement - the foam on the walls warm up the surfaces enough, and stop moisture transport through the walls. I was looking at some data from last summer and we only had really high RH down there (over 90%) leading up to Hurricane Irene.

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