To test for drafts in the summer, go outside to a window. Place your hand near the window’s seam and see if you feel any cold air. If you do, this means that air from your air conditioner is leaking from the inside to the outside. You can also test for drafts by turning off your air conditioner, heater, or any fans. Then, light a stick of incense near the window. If the smoke is pushed toward the window or away from it, you have a draft.
If the window has a slight lip for a screen, include that in the measurement as well. Measure from inside the building, as you will attach the foil from the interior.
These added inches will also give you enough space to fold the sides of the foil over to prevent injuries.
You can also remove and move these pieces of insulation as often as needed.
Heavy-duty kitchen foil can provide even more protection, as it is thicker.
Handle the foil with caution to avoid cutting yourself on the edges, which can be sharp.
It also helps if you flatten the foil slightly with your palm. Don’t bend it, just apply a bit of pressure until it’s flat against the window.
