My furnace blowing cold air.

My furnace keeps blowing cold air and will not heat up the house. I changed the filter and it ignites and flames go on but do not stay on long before they shut off.

I have a 30 year old Rheem electric forced air furnace which actually runs great, usually. When I bought this townhouse five years ago, there was a home warranty. The first time I turned on the heat for the season, it blew a fuse. When the repairman came out, I asked if the unit should be replaced...

Hi! Our gas furnace kicks on and blows hot air, once the house heats up to the set temperature the furnace kicks off. After that, it will not relight until we either turn it off or move the furnistat higher. Could it be the pilot re-light or a thermostat going bad? I think the furnace is 14...

I have oil heat and I noticed that in only one room the air that is blowing out of the register on the floor is cold. How can the other s be warm and one cold? Is this something I should worry about?

Hoping for help here. I recently had my ignitor replaced. Before that, the furnace wasn't working at all. Now it starts out blowing warm (not hot) air, then gradually over a period of a couple of hours, the air cools down until it is completely cold and the temperature in the house drops...