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I'm not an expert at all, but from my understanding, the ideal building is one that has so much insulation that its interior is kept at a set temperature with very little cooling and heating needed.

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You also need to exchange air with the outside so that CO2 doesn't build up with people inside.

You still need to get rid of heat generated from inside buildings and potentially deal with the impact of ventilation.

There's heat recovery ventilation.

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