HVAC Questions? Ask an HVAC Expert for Answers ASAP
My furnace doesn't seem to blow air out of the registers as strong as it used to. Yes there is a new filter. I even cut out a side just before my ac coils to clean them just in case anything was blocked. It wasn't. I did have a new furnace, guts if you will call it, they only replaced the interior, a few years ago. But the air just barely comes out of the registers. It used to come out strong enough to blow my curtains. It doesn't now. My furnace company, i'm sorry to say is useless and they say they have no idea why this is happening!
Where is the furnace located. In the basement? How many floors are you heating? Does this happen with the heat and cool?
It is located in a crawl space where it has always been. I have a one floor ranch...No basement. It happens on both the heat and cooling. Nothing has changed since I had the unit put in... Except for the new guts of it.
When you take the filter out does it blow any stronger?
When you cut the hole, you could see the AC coil and it was clean?
Yes and I washed it and then blew air through the coils with a compressor.
How old is the fan motor?
Have you checked the blower assembly itself to see if the blower wheel was dirty?
I am not sure.. Maybe 10 yrs or so. But I have already asked my furnace company to come and check it. The guy said it was fine. He was the one to suggest cutting the hole in the side. When they changed the guts they found a dead mouse on it, said they cleaned it off and it all looked good. I try to run just the fan every so often because I live in the country and mice are plenty!
Any chance there is a hole in the supply duct?
All the work was done a couple years ago..... Bryant was involved with a lawsuit.. I got a free new interior then. October/November just passed, I called my furnace company about this, they sent the guy out, he checked everything, said it was good but i should do the hole thing. I did and no change.
How would I look for that?
Is the duct sheet metal or flexible?
Metal and I crawled once to look for holes that i could use duct tape on. Didn't see any, but I do have vents that push warm and cold air under my house since I only have a crawl space and to prevent pipes from freezing.
I have even gone to the point to vacuum out everything, I could get the vacuum into.
There is an airflow test that can be performed where they can measure the amount of air that is coming from your duct in CFM. Not sure if all companies have that capability but that is about all I can suggest at this point. You may also try getting someone out to clean your duct and see if that will work.
Duct cleaning companies have a much stronger vacuum
Does duct cleaning really work?
Depends upon the company doing it and how long the system has been in place. I am not a big believer in it, but there are some that swear by it. It might be worth a shot in your case.
I haven't heard anything good either.
Not all HVAC companies do it and it is almost a niche market in itself. The changing of the heat exchanger should not have caused your airflow to decrease though. Unless something got trapped in the blower opening. Have you taken the blower out yourself?
So I would have to specifically ask someone to do a CFM test? It was going before that and that is why I asked them to check it out once they had the furnace out. They had to unhook it from the crawl space.. Take it out side and take it apart to put the new one in. No, I haven't tried very hard to see into it as the furnace is mounted under my house, not on the ground and it is also sideways. How hard is that to take out?
Not real hard to take the blower out. The hard part is getting into that crawl space and having enough room to maneuver.
The blower is held in by 2 screws. Not sure how nimble you are, but you may have to remove some wiring as well. Most of it is plugged into the control board and is marked.
Crap on the electrical part! My blower almost looks like an air-plane engine. It's encased and sitting in the middle is the squirrel cage. Does that sound about right? If so then I have to take that apart or rather out? Is there anyway that I could get pic/instructions to do this?
No need to take the motor out of the assembly, you want to take the housing out of the furnace and look inside of that opening to see if it is clear to the furnace
What housing are you talking about? You mean to take the whole blower, housing and all out to see if that is blocked?
Yes. Pull the whole housing out of the furnace. Then look inside the hole to the furnace to see if there is anything blocking it
If so that housing where it is mounted looks as though there are no ducts going to it. Laying on it's side the blower is on the bottom part, the hole of it with the squirrel cage is facing up. Correct?
Once you pull that housing out you will see a square hole to the furnace. Look inside of it and you should be able to see clear to the AC coil
That guy I told you who told me to cut the hole said when he felt just behind the ac on the duct it seemed warmer and that's why he figured there may be a blockage. What you just said when I cleaned the ac unit I was on the furnace side. I haven't looked on the other side. Maybe I should just turn on the blower and sit there and see if or where the air isn't coming from? So basically I will be looking behind the panel that has all the wiring to see if there are any blockages there?
Does your AC cabinet have an access door or is it solid sheet metal?
It was solid until I cut a hole. The coil is sitting inside my furnace ductwork.
The air has to pass through the coil to blow air into the house.
Correct. Open that hole back up and turn the fan on and see how stron the air comes out of that hole
The hole I cut into the duct?
Yes, if it is not very strong, then the problem is lower. If it is strong, the problem may be higher in the duct.
Ok... When I look into the hole, on the right is the coil, there's a space then I can see vents...sideways
I don't get the lower and higher thing. If it's higher, then it must be in the duct work after the coil and stuff?
Correct. You have a main trunk off that coil
If not, the it is before the coil somewhere.
Yes that goes to the left and that is where the fan is and I put the filter
This sounds like fun! So basically I will end up having to take pretty much all of it apart to get this maybe to work?
Why do you think they told you they found nothing wrong. It isn't easy. Much easier for me from where I sit in the comfort of my own home, than to be in that crawl space. I have been in many crawl spaces and dreaded each and every one of them. I am 6' 5"
Would it be in my best interests to get a pro out here? I am a female and can do almost everything by myself but this is crazy. They told me that because the potlickers are lazy! Oops sorry for that. Oh yeah, you are a lot of help now. I am thinking maybe I could start up something the same way! To be able to sit at home give advice and get paid!! Well your height would be a problem.
No guarantees that you will even find a blockage. These are just things I would check if it were me and I was on this service call.
Get a company that will actually do the job right is always a problem. Some do not go the extra mile, get their money and go.
Hope not to get a callback as you are sick of being lied to.
So if I do all that and it proves that it wasn't any of the above, what then?
I know the game some of these companies play. Since you say you have a ranch style home with only 1 floor means there should not be any dampers to worry about. A damper is basically a way to shut duct down to push air where it is needed. Usually done in a multi level house where you do not need as much AC in the basement as you do on the 2nd floor
My company was good but I don't know what happened. You would think they would care because I also buy my propane from them. I could always go some where else but as you said the next one might be the same. But there are dampers under my house. I need heat to keep the pipes from freezing. I haven't ever closed or opened them. So I should close those dampers for the summer and open them a bit for the winter?
These dampers would be in the ductwork of the furnace
Yes they are, but they are inside the pipe. It must not be that because they haven't ever been moved. It has to be the other
There would be a handle in your ductwork to open and close them
This one would be in round duct. So do you have these
Well they are inside but have a handle like that. Yes I have these
There is a wing nut on the handle? That should lock it in place
But closing them would only solve the cooling part maybe
Not sure, but it is worth a shot
I will try that and if it changes the amount of air then what is the solution for the heat?
Not sure about that one. You say these are open in the winter to provide some heat to the underneath of your house to keep your pipes from freezing
Yes, they have always been open since the furnace was put in. The air flow was good
Not sure then. I am out of ideas. Try closing them and see if you get more airflow though
I will. If no more air flow then I know it will be near the fan. At least I hope! All I can do is either try what we have discussed or call someone in.
All right. I sure hope it works.