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After 16 years, Ecobee is shutting down support for the original smart thermostat
(www.theverge.com)
This is a most excellent place for technology news and articles.
Assuming I:
"No you idiot, you just have to spends thousands of dollars on equipment and then you can save $100 a year"
Do you realize how ridiculous you sound? Good for you that you're saving money, but I'm just giving a personal anecdote here, not writing a thesis on home energy management.
You don't need solar panels. Could also just be dynamic energy pricing. Also do not need a water heater. Thermal mass could just be heating the place at a certain time. Don't get the bit about temp changes, maybe you mean you never heat or cool your place?