Let the tenants provide window air conditioners and their own washer/dryer.

I believe the other units in my area have wall mounted air conditioners but I don't know if its standard for tenants to bring their own or not.What would be best way to find out?

I'm sorry if I'm missing something obvious here but the title of this thread is how to make sure you tenant will change an air conditioner filter, so why are we talking about furnaces??

Toiletries (toothpaste, soap, hand soap, shampoo/conditioner). 

All electric furnaces and air conditioners.

T Boone Pickens went on TV and pledged a massive fortune on wind energy. . . only to abandon it when it didnt pan out.I have yet to see any vampire, even on True Blood step up, or for that matter any bazillonaire and coin Virgin Solar.You both are wise minds, to urge caution.Brother and Neighbor Matt Devincenzo, you and I both know of the brownouts here in Southern California, I would be afraid to fold the electricity into the rent check, especially if I get a granny tenant that runs the air conditioner all summer.Again gentlemen, very wise words. . .

We had already planned to renovate the bathroom, but will use this misfortune to alter the layout of kitchen, bath and laundry.Today, much of the on-slab, styrofoam insulation below the subfloor had to be removed due to prolonged exposure to animal urine.We also discovered that a 10' section of the back wall needs to be rebuilt - a through wall air conditioner had been broken loose in its mounts which allowed water to make its way into the interior of the wall and rot out the studs and sill plate.

Window air conditioners , the same thing .  

Hi Peter,This might shed some light on the temperature: https://dunckleeinc.com/what-outside-temperature-is-too-cold-for-air-conditioner/#:~:text=Because%20it%20is%20outside%20most,is%20below%2060%20degrees%20Fahrenheit.

Even using square feet or number of occupants is not fair because electricity usage depends more on how much they run major appliances like the air conditioner.