Question

Very Short Answer Questions:
1. Why do air-filled cavity walls, keep a house warmer in winter
than solid brick-walls?​

Answer 1

Answer:

Heat will always flow from a warm area to a cold one.

In winter, the colder it is outside, the faster heat from your home will escape into the surrounding air. Cavity wall insulation slows down the rate at which it escapes, keeping as much of it as possible inside your home for as long as possible.