If the crack is in your ceiling hot air in the attic can draw/suck cold conditioned air out. It happens through a natural principle of science call convection.
As we age, our senses of sight, touch, hearing, and smell tend to decline. Our physical abilities are reduced, and certain tasks such as stretching, lifting, and bending become more difficult. In addition, we also experience a slowing of judgment and reaction time. As a result, we cannot respond as quickly as when we were younger.
Normally, you’d find a string hanging from the cover of the stairway. For outside locations that might present a bit of a security issue. A quick pad lock will help secure the hatch. Done…unless there was NO string to pull!