In the winter, in colder climates, make sure your unit is kept at a temperature no less than 50 degrees, otherwise there is the potential for freezing pipes and structural damage.Twice we have found candle burn marks under kitchen cabinets and wax drippings in carpets after tenants had their electricity cut.

Just curious: In cold-weather parts of the country where winters go below freezing temperature, is it typically easier to negotiate lower purchase prices during the winter months?

The thermostat is located in one unit, who is instructed to leave the heat set at one temperature.  

I once attended a corporate meeting where the guest speaker was Rudy Giuliani and in addition to being paid for the speech, the contract called for the room in which he gave the speech to be maintained at exactly a certain temperature +/- 1 degree while he's in that banquet hall. 

In the Midwest we have seasonal variation in temperature that was apparently causing some movement. 

The temperatures have been down in the 10-15 range, and has recently gotten up to around 40 or so.Those poor tenants! 

The inspectors also used an infrared camera which allows to detect cooler/warmer temperatures behind walls and hard to get areas.  

Nothing worse then selling a house and getting a call the first 20 degree or 90 degree day that the system will not maintain temperature and the contractor is not answering his phone :) good luck 

Most shielded/sleeved PEX is typically, rated for extreme temperature ranges (high/low) and will hold its shape and integrity better in those situations. 

The following services are included: A physical walkthrough of the building to evaluate the potential presence of mold; Collection of tape lift samples of suspect mold and/or collection of air samples indoors and outdoors using slit-impactor Zefon cassettes, then submission of those samples for laboratory analysis; Temperature and humidity testing; Moisture testing using an infrared camera and pin-contact moisture meter; Collection of bulk asbestos survey samples of suspect materials which the consultant  feels will need to be disturbed to perform mold remediation work ;Testing of paint (per-1978 buildings only) and ceramic tile which the consultant feels will need to be disturbed to perform mold remediation work with an X-Ray Fluorescence machine; Photographs of the subject property and of situations or materials of note with regard to mold; Preparation of a formal report containing photographs, conclusions, recommendations, and laboratory report(s).