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Originally Posted by AC_Hacker
So if your 1890 house is 75 m2 (total wild guess), then your total annual energy use would be 75 * 120 = 900 kWh for the year.
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Oh, you do your arithmetic a little differently over that side of the pond
. When I went to school 75 * 120 was 9 000 not 900. Or 750 per month.
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I am struggling to get my 1890s house any where close to 75kWh per month. In fact, in my least-use months, I'm still using 6 times as much, even after all my work.
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6*75=450 which is well under 750.
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You must tell me your secrets!
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No real secrets, just:
- some ability at basic arithmetic
- economies of scale (my house is 724 sq m, not 75, so the PassivHaus target is 7 240 kWh
per month; not exactly stringent)
- additional wall insulation, inside and out
- good attic insulation
- well-insulated hot water storage
- GSHP for heating
- 5 x 20 tube solar collectors
There is still much more I can/should/will do to reduce my energy consumption. My approach is for slow but constant improvement.