Hunter 44377 - 7-Day Digital Programmable Thermostat (Home Thermostat, AC, Heat) Universal compatibility means it works on all system types Installs easily in just five minutes Comes pre-programmed or use the 7 Day programmable feature Energy guide and override for when you are away Touchscreen locking keyboard and filter change indicator Install in 5 minutes or less Universally compatible with most furnaces and cooling systems Low battery and filter change monitor Save away one touch override Keyboard lock and permanent override features