I have recently retired from the Air Force and have started into the world of business.  

I mean if you checked/changed the air filters and it/they were built up solid with dust and debris that could definitely aid in burning out a capacitor, but they do take time to burn out.

This means that the electrical is likely made from copper and is grounded.Running new ground wires and fishing wires behind walls can be very expensive, so having electrical that is similar to today's code is a plusProperties in this era also had ductwork - meaning forced air heating and cooling.

As the ad pointed out that even included AIR CONDITIONING!

As an owner is it better to a) install mini splits or  b) make renter supply their own air conditioner.

Yes by establishing a "co host" in your property listing on air bnb

Have both an air conditioner and a dehumidifier system. 

Even a good over the air antenna would be nice to be able to catch local news during our stay. 

Giving 80% of work and turnover to repair companies and handymen I trust, with the other minor maintenance ( sprinkle system condition, air filter checks, exterior inspection for wear ) done my self.   

From the living room, step out onto the large deck and soak in the beautiful mountain views and fresh air; a great way to unwind at the end of the day!