House was 17 years old all brick rnach house with Andersen windows, solid hardwood floors, gas heat, ceramic tile baths and a new 6 month old roof. 

This is the simplest method, but it also means your tenants are more likely to abuse the utilities by leaving windows open with the heat or A/C running, leaving lights on, ignoring the toilet that constantly flushes on its own, etc.3.

Now keep in mind he at least did 1 correct thing, applied to be added to lease.

Hi BP,Just wanted to get thoughts on different heating options.I need to install a new heating system in one of my apartment units (approx 580 sqft) but wanted to get thoughts on whether an Electric Wall Heater was a good option?

Educate your cleaning staff on what to look for (tiny dark spots, eggs, etc.).Heat Treatment/Preventative Measures: Some STR owners do periodic heat treatments or hire pest control companies for preventative maintenance.

I had one were my PM calls me its in INDY cold winter they just had baby cant  afford the rent and heat just take no payment for 2 months then they will add the balance any pay it off.. well of course after 2 months they just left  LOL..

Central heat & air*I made this below chart based on this community shared knowledge (Thank you all).

We have a heated garage at our STR.

I’m not super keen on having long-term tenants in a single-family home in California, but I’m open to advice on that.The house is in decent shape but could use new flooring, a paint job, and potentially heating and/or central AC, as well as blocking/taking out the existing fireplaces (don't love the idea of fireplaces in a rental). 

This year we had a heat pump cleaning, testing refrigerant charge (didn't need any added) and a capacitor replacement, bill was $157.05, factor I consider are the age of the existing unit, if it needed a charge, potential leak, cost of refrigerant (over the years there have been many varients of the type of refrigerant).