My problem is that my door has a wide crack under it. It lets in insects and lets out the air or heat. I know you can use a foam seal but need something to go all around the door. I haven't tried any thing yet because I dont know what to start. Can anyone provide a suggestion for the method I should use?
if you are not allowed to add anything to the door you can buy a long round cushion that you put in front of the door (or train your dog to do that :) )
If you are allowed to add something to the door you can install a sweep: