Warming

[JEN_I]

As of yesterday, my thermostat is taking an hour to increase the temperature two degrees in one room. It previously took 15 minutes. Now it stays one temp and never reaches the desired temperature. 

[Patrick_Caezza]

All thermostats including the various NEST thermostats are just switches that turn the heat on or off. If it is taking a long time to reach a set temperature you need to look at the furnace/air handler to see if it is working correctly.

[Pkurinsky]

Except that Nest has multi-zone functions.  My nest will not kick off the heater until stage 2, which is when the room is more than 3 degrees below the thermostat setting.  Paid a plumber emergency call fee just yo gind that out