One easy way to find a draught is to wet the back of your hand and pass it over the area where you suspect a draught may be. A draught would have a noticeable temperature change. If you’re not sure where the draught is coming from or if you want to be thorough, you can get a professional to inspect your home. Your draught-proofing expert may use a smoke pencil or match to check your home for draughts.