I considered getting an Ecobee for the data logging function but was put off by the price. My current thermostat has an 'energy' button that counts the run-time based on when it is calling for heat or cooling. It only shows today, yesterday, this week, last week, and total since last reset. If I forget to take down the data, I lose it and it sucks but it's interesting to see the patterns related to outdoor temperature.
I'm glad I didn't take the plunge because I would not want to replace the thermostat just to get continued logging. The whole idea of logging was to identify patterns and see the differences that air sealing and adding insulation makes(air sealing and insulation reduced peak load furnace runtime to 80-85% of the usage my house used to need).
That really sucks that they are willing to drop people like that.
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