Installed in well over 70 million homes and buildings, the round heat or cool only manual thermostat is an easily accessible and reliable option to adjusting your surrounding's temperature. This model has been designed to be especially user friendly and features a simple and precise round that's been celebrated for its ease of use and precision. Mercury free and featuring a decorative covering ring to cover surrounding wall marks, the round heat or cool only manual thermostat is a modern classic that has earned its distinction as a top end thermostat.