On Tue, 24 Dec 2013 19:32:24 -0800 (PST), Daring Dufas TeaBillie on
welfare wrote:

How in **** is someone going to know that? I've never seen a thermostat with statistics.
Then you have not seen many thermostats. Virtually any "smart"
thermostat can tell you what your daily and accumulated usage is. Mine
tells me today, yesterday, and seasonal total.
If you don't have a "smart" thermostat, just connect a clock to the
furnace - it runs when the furnace runs, giving you total run time.
You either record the time every morning, or reset the clock.
Definitely NOT rocket science.