Who’s to say they won’t turn off your ventilation system when they realise they’re paying for the electric that runs it?
Could be a big expense for little benefit. I’d insist in fans being left on and no clothes being dried in the house. It might be worth informing them that drying cloths inside and breathing in that moisture is very bad for your health.
I took this approach with a tenant and the damp miraculously went away soon after.