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Weight is only relevant if you let the house cool down.
A colleague of mine has a modern house (built 2 years ago) and said it would not cool down noticeably in a week. Its heating is an air2air heat pump (inverse A/C).
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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