![Joey Fox on Twitter: "The thermostat fan needs to be on and not auto. Auto = fan turns on when heating or cooling are needed. If they aren't, there's no ventilation. Fan = Joey Fox on Twitter: "The thermostat fan needs to be on and not auto. Auto = fan turns on when heating or cooling are needed. If they aren't, there's no ventilation. Fan =](https://pbs.twimg.com/media/FsRI0xRWcAQ3vH3.png)
Joey Fox on Twitter: "The thermostat fan needs to be on and not auto. Auto = fan turns on when heating or cooling are needed. If they aren't, there's no ventilation. Fan =
![Stupid question, but, setting it to auto like this means it'll switch between heat and cold as it needs? On my old thermostat auto just turned the fan/blower on, no heat or Stupid question, but, setting it to auto like this means it'll switch between heat and cold as it needs? On my old thermostat auto just turned the fan/blower on, no heat or](https://i.redd.it/pfm89opr4mp71.jpg)
Stupid question, but, setting it to auto like this means it'll switch between heat and cold as it needs? On my old thermostat auto just turned the fan/blower on, no heat or
![Auto or Off Fan Setting – Which is Better for your AC System & Furnace, Andover & Newburyport | Correct Temp Auto or Off Fan Setting – Which is Better for your AC System & Furnace, Andover & Newburyport | Correct Temp](https://correcttemp.com/wp-content/uploads/2019/08/correct-1024x721.jpg)