[qlm]

I've never been sure how to reconcile this with advice about insulation.

It's currently really cold where I live, and I am trying to limit outside air coming in as much as possible. This then leads to the air having uncomfortably high levels of CO2, as confirmed using an air quality sensor.

[Atheros]

It can't be reconciled. Which is why there are going to be more posts about air exchangers on HN in the future.

[BenjiWiebe]

Well I'd word it that it can be reconciled; the energy-recovering air exchangers are exactly what reconciles it.

[lm28469]

> with advice about insulation.

Good insulation only works with good ventilation anyways, the goal of insulation isn't to make an house completely airtight

Look into these things: https://en.wikipedia.org/wiki/Heat_recovery_ventilation