The most impactful part, they monitor our STR's 24/7. 

We currently use a simplisafe system to monitor the driveway to audit how many guests enter and if they bring pets.

If you have a heated pool it is imperative to have a wifi control on the heater that you can monitor and an excellent pool service company.I do disagree with @Chris Watson about the small drop in fiberglass pools.  

Once it’s in their fold, they seldom monitor price, or respond to reviews, etc. if things are operational they consider that “good enough”. 

Quick question - is your clean team able to get some test strips and chemicals (or even a bromine floater) to monitor chemicals between each turnover?

It's not smart to put all your eggs in 1 basket - who's going to monitor them?  

However, for rentals, you do need to have someone monitor and add water to the system.   

Would prefer to do something closer to home so I can avoid having to get on a plane to monitor the deal. 

I also monitor Colorado.gov for state issues and every Realtor associations.

If they're relatively small, open concept and 1 story then you could do a vented gas rinnai monitor heater.Or if it's more cut up and you've got high ceilings then you could run a forced air furnace with the duct work at the top of the ceiling w/ a drop ceiling below to hide the duct work.