If your windows are closed tight and you still feel a draught, you may need to investigate possible gaps underneath the sill. This isn’t always an obvious place to look, but you may find that a silicone caulk around the bottom of the sill is all it takes to block gaps and restore warmth and cosiness to your living space.
You should check all around your walls and frames for gaps or cracks which may be contributing to heat loss. Cavity wall insulation is a popular choice for preventing heat loss in older properties where wall insulation isn’t already present.Â