What you should look for is the phone number of a respected HVAC contractor in your area, who can knowledgeably assess the situation and diagnose/fix the problem. If it's fixable, Keep in mind you have a furnace that's nearly 25 years old.

I don’t understand why you would need to shut off the gas line to replace a blower motor. Even if you the use the argument of being very cautious then it would appear the motor was not tested with the furnace operating. I would be suspicious of this HVAC company if what you stated is accurate.

does furnace have a standing pilot light?...bad igniter?...I would be calling an HVAC pro...

"During the summer, the blower motor was replaced under my home warranty program as it stopped working."

Time to call the warranty company again.

mike_home - I think you are on to something. The HVAC company that came to my home to fix the blower motor was from my home warranty company. I remember thinking how their customer service during the initial consultation was 'terrible' and I was thinking I would never use this company, but I had no choice. The warranty company would not let me select my own contractor. Of course after reading the reviews of this company (Google, Angie's List, etc), they did indeed have terrible reviews. Also, I'm in agreement with you that they probably never tested my furnace after fixing the blower motor because it was over 100F that day.

tigerdunes - as mentioned, the furnace does light when I turn up the thermostat and the burner does stay on the entire time it is still blowing cold air for some reason.

Elmer Fudd - that will be my plan, but first I want to see if I can diagnose the problem. It is very strange that it was working last season, and now will ignite the burner, but is only blowing cold air.

Our furnace was doing the same thing as yours last year..Have you checked the furnace filter to make sure it is not dirty and needs replacing? Also shut your electricity off, and see if you can reset the relay switch on the furnace, usually where the panel is, push it and it should click.. They sometimes wear out..We ended up having to replace our relay switch.

jinnylea - thanks for this. Yes, I did replace the return air filter for this unit. I will definitely give your suggestion about turning off the AC and see about resetting the relay switch. Believe or not, I have seen 'weird' things like this before on another home I own, e.g. like resetting the thermostat. I have a smart thermostat, but the problem at my other home was the the furnace wouldn't even kick in with the smart thermostat, but my HVAC contractor thought it was wiring related when he came out, but I told him nothing has changed in my house. After pulling the batteries out of the thermostat, resetting it, things started working. This is different - as explained above, the furnace does kick on, but is blowing cold air.

Gil, I hope you understand what I wrote above.. I will explain it better just in case.. :) There is a relay switch on the furnace usually located where the panel is. First, shut the electric off on your furnace as a safety precaution if you are not familiar with electrical work. Than locate the relay switch on the furnace and push it in a bit until you hear or feel it click. That should reset it, and then turn the electric back on to the furnace. Hope that helps. Good luck!

PS: Our furnace would kick on and run but would blow out cold air also. Our heating and cooling guy showed us how to reset it, and it got it running/heating right, but he had to eventually order a new relay switch for the furnace because the original one wore out.

jinnylea - I have attached a pic of inside of my furnace (NOTE: the power is currently off to my furnace). Which one of these is the relay switch? A, B, or C? I think it is maybe 'B'?

If it is indeed B, you are saying to press and hold it until I hear a click? Once I do, release it, put the covers back on, and then re-apply power?

Yes, it looks like the button on B. Press down on it hard enough and see if you feel or hear a click. Turn electric back on to furnace , then go turn thermostat on so it clicks on, then watch furnace to see if glows and ignites and stays lit. It will ignite the gas..kick on the blower and run until it reaches the temperature you have it set at. Hopefully it kicks out the heat.. Then see if it stays on..

Well.... unfortunately when I pressed the button on B, I didn't hear any type of click. At any rate, I connected everything back up, and it is still blowing cold air. Like before, the burner ignites once the thermostat is turned up, stays lit then entire time the thermostat is up, but it is blowing cold air. I might need to call the professionals :-(

Sorry, Gil. It was worth a shot..

Hey, by chance is your furnace unit a dual purpose for air conditioning and heat ? If it is than the thermostat could be set on a cool setting.. And it would need to be switched over to heat. Just a thought. .

You have to understand how companies that represent home warranty companies get paid.

They collect a service fee from you.

They collect repair service fee from home warranty company.

Say they run 500 ac calls during summer. What is most effective way to create extra work in winter?

Shut off gas to furnace. LOL.

I know they do this, because I've seen it first hand. I talk to people who call me to fix their system. I DO NOT work for home warranty companies.

So why do people call me? Because they cancelled their home warranty policy.

This thought that you are going to avoid costly repairs to your HVAC system by using home warranty company... is a MYTH.

Your mileage will vary.

"Your mileage will vary."

Yes,,,,it is often worse still.

Well... after calling out the professionals this morning, I have an update on this issue. The reason it was blowing cold air when the furnace was engaged was that for some strange reason when I would turn up the thermostat for the heat to kick in, the AC would start up at the same time!

During my troubleshooting, I didn't notice that the outside condensor unit would start when I turned up the thermostat to turn on the heat. The HVAC technician ended up removing one of the jumpers from my smart thermostat which fixed this problem. I told them that nobody has touched the jumper and it was working just fine previously last season. Even more interesting is that my HVAC unit for the downstairs has the same thermostat (everything is working fine) and it still has the jumper in position.

I wonder if there is some type of defect or bug with the model of smart thermostat because I recall around Thanksgiving having a similar issue in another home I own with the same thermostat. It was a little different - -the heat wouldn't come on either (the tech thought it was wiring, etc and I told him nobody has touched the wiring or jumpers on it either).

Thank you everyone for all of your help and suggestions!

Do you know what jumper had to be removed. When the tech connected the new blower motor he may have wired it in correctly. A home warranty company strikes again.

It was a jumper between Y1 and W1... however, looking at my other thermostat that is working, I see that the jumper between Y1 and W1 is not actually 'jumped' together - it is only connected to one pin. What I don't know is if the jumper for the attic unit was jumped across both pins, or just hanging on one of them. Either way, the HVAC technician just removed it and put it in one of my drawers near by.

" for some strange reason when I would turn up the thermostat for the heat to kick in, the AC would start up at the same time!"

See,I told you so, it's like my friend's that use's cold flame to cool his shop in July.