Agreed, with a well designed overhang or adjustable shades south facing windows do a great job of heating the house up.
My super leaky low wall insulation house get up to a nice toasty 23 or 24 C on sunny days when it's in the low teens outside and that is enough to not need the fire going or heat pump running unless we drop near freezing at night. If the house was better insulated I don't think we'd need heating at all on sunny days.
The overhangs work out pretty well that no sun comes directly in until late august and is pouring in by early october on all of our rooms except one basement window that has no overhang. It gets hot during the summer so we keep the blinds closed in it.
Today is cloudy unlike yesterdays full sun and the house is much cooler and not warming. It's 18 upstairs at the moment so probably 16 down. I'll be forced to light the fire in a few hours.
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