The round Honeywell electromechanical thermostat with a bimetallic strip, invented in 1953: https://www.honeywellstore.com/store/products/honeywell-roun...
24VAC, dead simple, and reliable. My family’s lake house has 50+ year old Honeywell round thermostats still in service.
The round Honeywell electromechanical thermostat with a bimetallic strip, invented in 1953: https://www.honeywellstore.com/store/products/honeywell-roun...
24VAC, dead simple, and reliable. My family’s lake house has 50+ year old Honeywell round thermostats still in service.