Want to find all the spots in your house that are making your furnace work overtime? Grab a stick of incense and a lighter and spend a few minutes performing a sort of informal energy audit. Here’s how:
1. Shut off the furnace and any fans you might have running.
2. Raise all the blinds and pull back the curtains.
3. Light a stick of incense. Holding it very steady, pass it around the edges of all your windows, doors leading to unheated spaces, and electrical outlets and switches on exterior walls. Use a slow, steady motion, and pull the stick away from the burning end rather than pushing toward it. As you move, watch the smoke. It should rise smoothly from the burning end of the stick. If it shimmies, pulses, or otherwise appears to be disturbed, you have an air leak that needs to be sealed. (You’ll also want to pay attention to the burning end, taking care to keep it from touching curtains or other flammable materials, and be sure to have something handy to use as an ashtray as you work.)
4. Make a note of all the places you found leaks, and find an appropriate method to seal them.
If you find leaks around windows, the easiest solution is to seal them with plastic film; if you’re feeling ambitious, you can also insulate the panes themselves with bubble wrap or make Roman shades out of blankets to put an extra layer of warmth between the great outdoors and your living space. You can plug leaks under doors with an inexpensive DIY draft stopper made from rice and fabric remnants. You can buy insulating shields for electrical outlets and light switches, but I prefer to make my own for free out of the polystyrene trays that come with meat and some produce at the grocery store.
You won’t find every single source of wasted energy with a stick of incense, but in the absence of a professional energy audit — which can get pricey if your utility company doesn’t offer them for free — it’s a good, inexpensive jumping-off point to help you identify some of the most easily mitigated culprits. A stick of incense and an a little elbow grease can go a long way toward reining in high heating bills.