“I have noticed that the nest thermostat fluctuates in temperature 5-10 degrees and seems to be a common issue. Is the ecobee the same or is it accurate?”
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All thermostats have a "swing" in temp. The anticpator built into the thermostats will have a 2-3 degree (plus or minus depending on the mode it is in) swing to prevent the a/c or heat from short cycling. The Ecobee3 is the same. If I set it to 75 in a/c mode, it will allow the temp to raise to 77 before the a/c comes on and will cool it down to 73-74 before turning off. This prevents short cycling of the system.
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