"Locking" the thermostat at 70 degrees

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Greetings, 

I have yet to purchase my 1st income property but have been reading and watching a lot on BP (great stuff btw). 

I am wondering if a landlord of a 3500sq/ft, 4unit, section 8 compliant property can program the furnace thermostat to a specific temp (say, 70 degrees) and tenants wouldn't be able to run the bill up?