u/Common_Practice_7719

So the Nest thermostat in my house is acting weird. If you turn on the furnace, it heats like it should. If you turn on the AC, it cools like it should; provided that the set temp is lower than the room temp. However, while the AC is on, if you set the temp to higher than room temp (for example, room temp is 70 and you set the thermostat to 75), then instead of just leaving the AC turned off (like it should), the thermostat will kick on the furnace and try to heat the room. And no, the thermostat is set to "cool" and not "cool/heat". Anybody ever come across this before? I'm assuming it's a crossed wire and a software glitch, but I admittedly don't know much about this brand of thermostat. It's an all electric system by the way.