ecobee3 lite Smart Thermostat, 2nd Gen (Mistakenly listed as as ecobee Lite 2.0): $101.99 ecobee4 Thermostat: $119.99 You can read more about the best thermostat for Shabbos and a comparison of Nest vs Ecobee vs Honeywell here. Select gas and electric companies offer rebates when buying smart thermostats be sure to check your local companies’ offers.