Still Not Heat

[SilverSabre25]

Its not laziness. It works just fine during the day. But in the middle of the night it doesnt. So its hard to troubleshoot it

I would try a different repair guy myself.

How old is the furnace?

[dave4him]

Its only six years old.

[SilverSabre25]

Its only six years old.

well it shouldn't need replaced then or anything. I'd say that the thermostat is a likely culprit. Have you tried jacking the temp on the thermostat waaaaaaay up and seeing what happens?

He should have done more than clean a sensor.