First thing I would do is determine if there's need for it in the marketplace and get a temperature check on the political climate in your area.

They are the same temperature inside all year round.

Can a window crack due to very cold exterior temperature?

But yeah, less care is taken to insulate everything around here because the temperature here is more moderate than Canada. 

I don't blame my contractors for not wanting to work in these frigid temperatures with no heat in the house. 

Numbers convey color, character, temperature, size, and all the rest of it in real estate.  

Today was our first day with temperatures above freezing since early December and we just finished a month where the highs were <-17C (0F) and not a frozen pipe.  

Just last week a really nice property flooded during the extreme temperatures we just experienced.

Keeping the thermostat at 75 will keep the the heater running for long period of time to maintain the house at that temperature. 

Here in Vegas, we set thermostats to 80 in the Summer, and 67 in the winter.While 80 is quite high, its feel really cool when you come in from 100+ degree heat.We found that temperature to be efficient for keeping prospective buyers comfortable while keeping our utility costs down.