State should install cameras in bathroom stalls and watch what you do while you are inside a public restroom.

It really is not hard to install submeters in most cases.

Pex is also much easier to install and requires less access. 

Tankless WH cost has dropped significantly, they tend to last longer and are less prone to leaks but the initial switch might require upgrading the gas line with potential higher installation price tag.

We use solar energy and batteries to power any electrical equipment.

I have a tenant in Arizona, who moved in a month and a half ago.they keep complaining that the master bedroom is too hot.The whole house is ok but the master bedroom is hot.I offered them a portable ac, they refused took it but did not install.I offered to have a handyman come install it, they said they can do it themselves.I offered the ac guy to come check on the AC and asked them to call the guy, because he likes to schedule with the tenant directly, but they have not called himI asked if they waned me to schedule with the AC guy,- silence.They complain but wont let me schedule for them.I understand that the tenants are just complainers, but I want to cover myself legally.So in case, if they decide to take me to court, I would not be liable.What is the best way to deal with things like that?

I could either 1) install a coin operated set up for the two tenant apartments 2) install another regular set and have two sets in the basement. 

What type of system did y'all have installed?  

Better quality product, better installation, and making relationships is invaluable if you plan to scale.

Install should be about half a day plus disposal of the old system.