Furnace from cool air to lukewarm with hot air going up the chimney
I have a Goodman furnace that is not keeping my house warm. It runs 24-7 and it is barely 60 degrees in here!
Here's what happens:
When I turn up the thermostat, first the blower comes on and circulates completely COLD air throughout the house, then I hear the furnace do something and after a few minutes lukewarm air begins to move through the ducts. It never gets WARM. If I leave it set at 68 degrees, it runs continuously without shutting off, but the house won't get above 62 degrees or so unless it is at least 40 degrees outside.
Today I felt the ductwork going from the furnace to the vents in the home, and they are barely warm to the tough. I tried the duct going up the furnace, and it was so HOT I could barely touch it! It seems that it is sending the warmest air up the chimney while it blows barely warm air in the house.
If I leave the thermostat set at 60 degrees, it never blows warm air, but keeps that cold air coming through the house.
I do live in a rental house, and my landlord thinks because it eventually warms the house a little if you leave it running 24-7 that it must be OK.
Can anyone help?
Thank you.