I have a NEST thermostat (Display-3.4). My heating system is forced air heating. The heating system was tuned up in November.

The system blows room temperature air too much of the time, especially early in the morning (2am to 6 am). I wake up cold because the heater is blowing room temperature air. I've set the temperature, to 75, during sleeping hours, and it makes no difference!

I changed the filter a few days ago but it didn't make any difference. I live in Sacramento. The lows have been in the mid 30's to low 40's.

Any suggestions would be appreciated!

Thanks