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Video:How to Fix a Gas Furnace: Does Not Produce Enough Heat

with Erick Noack

If your gas furnace isn't producing enough heat, there are a couple potential causes. Here is a video with steps to take to fix a gas furnace if it isn't producing enough heat.See Transcript

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Transcript:How to Fix a Gas Furnace: Does Not Produce Enough Heat

Hi, my name is Erick Noack. I'm an HVAC technician for ABC Plumbing, Heating, Cooling, and Electric. And we're here for About.com. Today I'm going to show you a couple things you can check if your gas furnace is not producing enough heat.

Possible Causes for a Lack of Heat From a Gas Furnace

One of the most common sources of this kind of problem is a clogged filter. It's very important that you check your filters regularly and change them frequently for good furnace operation and best efficiency. The second possibility is that the furnace was not sized properly, meaning that it doesn't have enough capacity to keep the home warm. It's important that a heating and air company size the equipment for the capacity needed to keep your home warm. Another possibility, though it's pretty rare, could be that your burners could be clogged to the point where it's not allowing the furnace to create enough heat and meet its full capacity.

Check Gas Furnace Filter

Now we're going to talk about how to check the furnace filter. Furnace filters are really important. It keeps the air clean in the house and keeps the air in the furnace clean. In most cases, they're on the side of the furnace like this one is. Now, this one has a little cover that's over the filter. You remove the cover and that exposes the edge of the filter right here. This one is a washable filter, so it's got a little tab that you use to pull the filter out. It's going to trap dirt on one side and let the clean air come through on the other side.

Washable and Disposable Filters

The important thing with filters is watching the air flow direction. There's always an arrow that tells us which way the air should flow through the furnace. On most furnaces, people have drawn arrows that show you which way the air flow direction should be. This filter is a washable filter, so you're going to want to follow the manufacturer's instructions for cleaning. Make sure that the filter's completely dry before you re-install it. In some cases, you're going to be using water to rinse them out, you don't want to be putting water back into the furnace. A lot of people use a disposable filter. The key point if you use a disposable filter is make sure that when you pull that filter out all the parts are there and it didn't tear or leave any pieces inside the furnace. When you use a disposable filter, change it out, put a new one back in there. I always recommend writing the date on the side of the filter, that way you know how long it's been in the furnace.

Check Burners on Gas Furnace

So when you look at the burners on a furnace, you can kind of just the condition. This furnace is very clean and well maintained. If you see any kind of dust, lint or other kind of dirt in the furnace, that could be clogging one of the burners and causing a loss of capacity. In that case, it's really important to get a professional out to do a proper cleaning on the furnace for you. It's important that a homeowner is aware of the way his system is supposed to operate when everything is normal. So that way, when things do change, you can be aware of it and call for service before it becomes a bigger problem. It's going to help maintain the equipment, keep it lasting longer, keep it safe, and also reduce your energy costs.

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