1.   A big air leak is the hatchway cover under folding attic stairs.

2.   A spaceship rammed into Mir last year, crumpling its solar panels and causing a slow air leak.

3.   Check insulation and duct work for air leaks.

4.   Closing the damper on the fireplace will prevent cool air from escaping out the chimney, and installing glass doors on the fireplace will further reduce air leaks.

5.   Check for air leaks between the new jamb and the vertical stud of the rough opening.

6.   Fill all those air leaks, every nook and cranny, every seam, every joint and every hole in the house, in the foundation and anywhere else.

7.   Fill all those air leaks, every nook and cranny, every seam, every joint and every hole in the house.

8.   If it does, even when held still at that spot, you have drafts entering that indicate an air leak.

9.   Is there a simple way to test for such air leaks without requiring special equipment?

10.   It is harder to look for air leaks in attics that are insulated with loose fill, because this type of insulation cannot be rolled back.