Winter will be here soon: save-a-dime, use this Quick Tip

You can smoke out air leaks.
You will need a stick of incense.
Lite it and as the stick starts to smolder, move it towards the edges of your windows and doors. If there is a draft, the smoke will be blown horizontally.
No draft, the smoke will rise normally.
If you find a draft get your caulk gun ready. Blocking these drafts will save you some dimes on your heating costs.