Red mite can be controlled with paraffin or red diesel, if creosote cannot be obtained. Once they have got to plague proportions it's much more difficult.
You must check for them at least every other day, as within a week thousands will be bred from just a few mites.
Paint and allow to soak in any perch ends that touch any wall or other timber, as thats where they hide waiting to move onto the birds after dark.
Poultry shield and the like need re-applying every few days, as the eggs in the cracks hatch and breed more.
I cannot imagine what a nightmare it must be to be infested by red mite everynight.
If your birds hang around late into the evening and not go into the coop to roost suspect red mite and deal with it asap or in the worse case senario birds can die and a house may need burning to get rid of them all.