Product Description There's no longer a reason to use a mechanical thermostat. Get all the benefits of bringing your heating and cooling system into the digital age. The Aprilaire 8444 Non-Programmable Thermostat is mercury-free and provides pinpoint accuracy and control From the Manufacturer There's no longer a reason to use a mechanical thermostat. Get all the benefits of bringing your heating and cooling system into the digital age. The Aprilaire 8444 Non-Programmable Thermostat is mercury-free and provides pinpoint accuracy and control