With a ductless heat pump, you automatically have an extremely efficient air conditioner as well.

When I needed a new air conditioner - oops.

Since the weather is getting warmer, they would like to use their window air conditioning.The problem is that the window guards are not allowing the air conditioners to be installed.

So your turning units, like you might with apartments, fixing bad roofs, water heaters, heaters, air conditioners, leaking faucets, toilets, bad flooring, broken windows etc...

I’ll be supplying my own vacuums (thanks Avery) and guest consumables (toilet paper, paper towels, trash bags, shampoo, conditioner, soaps, etc) and the cleaner will provide their own cleaning supplies (cleaning sprays, mops, brushes, etc.).

The Home Invasion Couple from Hell - even though I have made it very clear that if you smoke, you should not book my room, guests do it making for a very awkward and uncomfortable situation, as they attempt to hide their smoking throughout their stay up to and including smoking by an open window while the room air conditioner is running.This couple also left beer cans throughout my home, presumably when they finished chugging them and crushing the cans on their foreheads.

I take it it's window air conditioners during summer..One thing you could do is give a concession of $ per month toward the rent.

I recently had a house in escrow and the the air conditioner condenser was blowing a fuse and we had to replace all the baseboards on the first floor.

Follow up question: all appliance are more than 10 years old (except the central air conditioner/heater).

I would tell them it is what it is and they are welcome to supplement the air conditioner with portable A/C or window units.