This morning I used the app to switch the thermostat from cooling to heating. Despite the switch, the app kept the cooling setpoint instead of heating (77 instead of 68). The app glowed red indicating heating was on. I had to manually change the setpoint from 77 to 68. I checked my HVAC unit and noticed the heat was, in fact, not on. Just the fan. I had to reset the thermostat and delete/reinstall the app to fix the problem. Between issues with this thermostat and my Nest doorbell I think it's safe to assume I've bought my last Nest product.