Ventilation and draughts

We need fresh air in occupied buildings, but it also makes sense if we can control it.  Draughts are uncontrolled ventilation and are also the cause of considerable heat loss. This can lead to discomfort, or cold, and to higher than necessary heating bills. The good news is that there is something you can do about it.  Ventilation is the controlled entry of fresh air into a building to prevent a build-up of stale, damp air that is it unhealthy to live in.