[kccqzy]

Because presumably in this case you would want to open a window for fresh air, and simultaneously run your heating system to heat up that fresh air?

I was responding to a comment that presupposes the need for fresh air. If you don't need that, feel free to close the windows then.

[Thlom]

You want to open windows in opposite sides of the house to quickly circulate air from outside to inside. 5 minutes should be enough. It will get colder, but most of the heat is in walls and furnitures and as long as you only open the windows for a few minutes it should be quick to heat up the air again.

[catiopatio]

You do realize that “open the window and hear that air” is massively energy inefficient, right?

[kccqzy]

I don't know; is it more energy inefficient than having a fresh air intake via a duct? Maybe they are comparable in the absence of a heat recovery ventilation system (mentioned by a sibling comment upthread)?

[BenjiWiebe]

Our house has a heat exchanger that exchanges air. So the outgoing air changes the temperature of the incoming air.

[mvnuweucxqokii]

You don't necessarily need to take in fresh air to freshen air in certain ways. It might suffice to pass it though a good filter.

[Zanfa]

HEPA and carbon filters do wonders for cooking smells, particulates etc, but unfortunately do nothing for the main reason you want air exchange with outside, which is CO2 buildup.

[TheSpiceIsLife]

Airborne allergens can be an issue, and dust more generally.

[throwawaylinux]

Seems like it would be more efficient to wear a climate controlled bubble suit than heating up entire rooms. And you could even go outside when it is cold or hot or dusty.