We're thinking of replacing the old front door, which I think is the main heat loss area in the house now, with a new "modern" one. Among other things, I'm considering switching from a letter slot in the door to a box on the wall near the door. It would be mounted on a brick wall in the entry/passage (so sheltered from rain but subject to wind). I think this would have advantages for security and reduced heat loss.
Any comments on this? Has anyone here switched from a letter slot to a box and found it a great improvement or problematic?
Thanks, Adam