We have an older gas furnace and it simply won't heat the house. We were told it might be the power supply leading into the house so we had that fixed. Next we were told it might be the thermostat so we changed it out also. It shows the gas burning, the blower comes on but only cool air circulates? Is there anything else I can try?

"It shows the gas burning" What does that mean? Do you have central air conditioning as well? Did it ever heat the house or is this a new problem.

I can see the fire burning when I look into the window, the blower kicks on like it is going to start heating up the house but it never gets hot or even warm. At one time it worked but so far this year it has been one problem after another. No centra

Call an HVAC tech to come out. If your furnace is more than 15 year old, consider replacing it You will spend more trying to keep it working that it is worth.

Have you changed the air filter? Make sure all panel on the furnace are in place