Chances are different parts are frozen in time at different periods of electrification.

It also has the benefit of alerting me if it detects a water leak which could be a life saver if say a frozen water line breaks in the middle of the night.

You may want to keep the taps trickling to prevent frozen pipes while it sits empty.

I buy a lot of foreclosures here in Upstate NY, meaning all of those lines that are buried in concrete have frozen and burst. 

Get in there and fix some frozen pipes, start with a hair dryer and graduate to a space heater, or (like I did) take your wife's favorite 'fancy' electric fireplace and drag it into the crawl space dirt to thaw the main floor P trap under their tub because you have no options and nothing is draining4.

Since then, I've been frozen on jumping back in the game, even with my involvement still in the space. 

Other large development properties taken up by three google sites, one Prime warehouse, Frozen storage, etc.  

Steven - The ground here in Denver is a bit more solid than it is in Houston, AND a bit more frozen this time of year.

Since buying the houses, I've had a rash of bad luck...A) 2 - 20 yard dumpsters filled and emptied of old tenants trashB) Electrical fuse boxes and lines stolen from one home for the copper - $7500 to replace 5 breaker panels, meter units, shut off switches, etcC) Copper plumbing in second house stolen, replaced with PexD) Multiple frozen / busted water lines throughout the houses, was never "winterized"E) And though the houses have been vacant for over 2 years, Indianapolis dept of health has found someone to pick on, giving me multiple fines for unsafe housing (missing gutter downspouts, cracked porch near steps, and get this...the plywood that was used to board up the windows was not painted the same color as the house!)

For your heating system, again make sure there are no drips at any unions, or frozen vents that allow water to pass.