It comes down to the tenants not being the customer. The customer is the government. And as long as they're paying, you do the least possible to maintain that.
If the government standard says you need to do maintenance on HVAC once every 6 months. You do maintenance once every 6 months, regardless of whether or not it needs it more often.
If the government standard says you need to do maintenance on HVAC once every 6 months. You do maintenance once every 6 months, regardless of whether or not it needs it more often.