Need some advice on t1ts

The house we moved into last year had a bird box on the garage south facing wall I think it should be north facing anyway due to a pear tree in front of it there was plenty of shade. However due to the tree producing a lot of not very good quality fruit I have cut it back quite hard. Do I lower the box to head height to be in the shade or get rid entirely or do I leave it. Will the birds figure it out that it may to hot to use. Another spanner in the work I saw a pair of blue tits going in and out of it.