Hi,
I have a Frigidaire FG6RK series downflow furnace. Recently, when the furnace starts up it will blow cool air out. It stops and restarts but sometimes still blows out cool air. It seems to do this until it finally gets warm air to blow out. I was wondering if this should not be happening. Also, even though I changed the threshold on my thermostat to /- 1 degree, the furnace will not turn on sometimes until it is way below that threshold. I can hear a humm but it does not kick on sometimes.

Any thoughts?
Thanks