Eli5: How do modern houses have both good ventilation and good insulation?

Question

I would have thought good ventilation would bring much colder air in from the outside thereby mitigating the benefits of good insulation. How do modern houses deal with this issue or is good ventilation much less important and I expect? (I’m in the UK so we don’t have blown air heating/cooling as standard here)

In: Engineering

Answer 1

Double-paned windows provide good insulation. Open them, if they’re well placed, and you get good ventilation.