@Zach Wright yes i agree that can be quite a worry. you may want to look into lockable thermostats. i have thermostats that are locked at a certain temperature and cannot be changed without a code.each city/state has laws on what that temp needs to be, but maybe this is an option for you.

Induction boils water in half the time of gas or conventional, adjusts temp even quicker and much more precisely than gas, has a much wider temperature range (simmers lower and seers hotter) and the surface doesn’t stay hot very long at all when the cookware is removed making them safe and easier to clean.

I would recommended CPVC as it can withstand higher temps as opposed to PVC.

vinyl tile flooring is very inexpensive and easy to put down, just make sure to acclimate to temp. for several days first. bath tub cleaning was a challenge, finally found a great product on amazon that worked like a champ.

It will get closed in and temp heat will be set.

The thermostat is currently in the basement where the tenants can't mess with it but turns on and off based on the temp in the basement which is much different than the second story making it hard to regulate.

https://www.redfin.com/AZ/Tempe/825-W-3rd-St-85281...4 units. 

The home must not get too cold.The fourth is to use heat tape, this is pretty amazing stuff but it on;y works down to a certain temp so I would suggest not just relying on heat tape.Fifth, hose bibs are one of the biggest issues because they expose your water line to the outside temps.

About 90,000 individuals in the Milwaukee, WI area were left without power due to snow storms and below freezing temps.

With weather getting warmer and the number of days below the temp needed to make snow, ski seasons will become shorter and shorter.