I have hour meters on maybe 20 systems now. I like to see the run time when it's "4" degrees in Kansas City. 99% rate in KC is +4' degrees. My goal at 4' is 100% run time. I have a super sealed home 2,100 square feet with a 2 ton ground type heat pump R-30 walls, R-60 attic, R-8 windows & doors with 98% run time @ "+ 4' ". When the strip heat turned on, it smelled up the home with the dirt off the 5 KW strip, heat burned off the dust. If you fine tune ACCA MJ with a blower door number and infrared camera you can get closer. If I find a real drafty building - I am more off. Or building owner just turn up the heat more.