Shop › einshtein Thermostat Image 1 of 4 Image 2 of 4 Image 3 of 4 Image 4 of 4 einshtein Thermostat from US$139.00 Energy Hub + Wall Sensor + Duct Sensor to fully replace your thermostat. Power Supply Options: Select Power Supply Options 24-277 VAC 50/60 Hz 120-240 VAC 50/60 Hz Quantity: Add To Cart Added! Energy Hub + Wall Sensor + Duct Sensor to fully replace your thermostat.