Window A/C units additional rent

[Bobby Balentine]

I recently spoke with another REI about window units. He said that he charges 75 dollars a month extra for each unit in the house whether or not they are being used. Meaning the tenant claims they don't use them to get out of paying the extra 75 dollars. He does this when he pays the utilities and includes it in the lease.

Does this happen often and is there a better way to make up the extra cost of electrical use?