These tenants also had the heater and air conditioners running at the same time - yep, utilities included.  

Of course this is all relative to your climate, maybe air conditioner is a better example in Houston, but you get the point.

Same for your air conditioners - If she doesn't like how you set it up then have her hire a handyman. 6.

Also it must be a big air conditioner to hold 6 #

It's a power trip.Then, after the shower head was installed, she said she wanted us to have some other tenants across a small breezeway from her, stop using their air conditioner because the noise bothered her.  

Windows units are about as efficient as any other air conditioner as long as they are sized correctly.Personally, I'd buy a few window units and say "Merry Christmas".

I had a tenant bring in a large dog that peed on the air conditioner outside and peed a large hole through the condenser.

The units were utilities included, as the old building was not separately metered.What we initially did, was allowed tenants to get an air conditioner - either window or portable - and pay an additional $50/month.What started happening was, tenants would sneak in portable units, and run them after dark.  

I agree with everyone - the best you can do is give the tenant permission to put in an air conditioner or de-humidifier at their expense.  

They had a window air conditioner running, and the wall gas heater about 5 feet away was also running.