Heat, Cool and Off are the straightforward settings of one switch on many thermostats. But what about the other switch, On or Auto? What's the... Nest thermostat can have up to five available modes: Heat, Cool, Heat•Cool, ... Your Nest thermostat can automatically switch between modes, but you can ...Programmable Thermostats in the Heating, Venting & Cooling Department at The Home ... Honeywell Wi-Fi 7 - Day Programmable Thermostat + Free App. I really like using the "automatic" system setting on our thermostats (Honeywell Prestige). That being said, I do not want to damage our ...There are programmable thermostats that automatically switch from heat to a/c ... and the thermostat will automatically switch from heat to cool.