Gas Furnace is Making Too Much Noise – The FixGas Furnace is Making Too Much Noise - Richard, my gas furnace makes a lot of noise when it is running and it is somewhat annoying and sometimes bothers me when I am sleeping. It is installed in a closet close to my bedroom. What can I do to fix this gas furnace that is making too much noise? Jenny

Jenny, sorry to hear about the noise your gas furnace is making. All gas furnaces make some noise when operating and we can break it down into three different noises. Depending on which noise your furnace is making will depend on a fix to your furnace making too much noise.

Gas Furnace is Making Too Much Noise | Diagnosis and Repair

First, is the gas burners. A lot of inshot gas burners make a noise when they are burning the gas. Additionally, unless you have a standing pilot gas furnace which is an older type of gas furnace and not typical in the average home today, your furnace will have an induced draft or forced draft motor to properly vent the combustion gasses and give the combustion chamber combustion air. Consequently, fuel needs air to burn. After the combustion process is complete you need to vent the dangerous gasses outside. The forced draft motor or induced draft motor helps this process. Those two things can cause noise all in themselves. However, there is another thing that can cause noise from a gas furnace. That is the blower motor inside the gas furnace that blow the hot air through the HVAC system duct work.

Gas Furnace is Making Too Much Noise | Diagnosis and Repair

So to recap there are three different things that will cause your gas furnace to make noise:

  1. The sound the burners make when burning the gas
  2. The induced or forced draft motor (you have either of the two)
  3. And the blower inside the gas furnace that blows the air through the duct work.

For the gas furnace making too much noise, I would first advise you to call an HVAC professional and have them give the furnace a thorough maintenance service to make sure there is not a bad bearing or something in one of the motors making too much noise. Sometimes a little oil will stop the noise if the motor has a port for oil. There are some motors that do not require oil. However, if you have one that does a periodic maintenance service technician should take of it.

Gas Furnace is Making Too Much Noise | Diagnosis and Repair - Caution

I would caution you not to block any vents or anything on the door that allows air to get to the gas furnace as the furnace needs fresh air to work properly. Again, do not block anything that would restrict the air from getting to the burners. Any gas furnace needs combustion air and an allowance for this combustion air was made when the gas furnace was installed so if you block this off to reduce the noise then your gas furnace will not operate properly and it could be dangerous.

The HVAC professional may not be able to easily solve your problem aside from the maintenance service I mentioned above. The blower will make noise if the ductwork is undersized. This will be a costly fix if that is the problem. You will need to have new duct work installed. The correct size of duct work. The burner noise and the induced or forced draft motor noise is hard to fix. It may require some additional ductwork installed to pull in combustion air from the outside. That way you can completely block off the vents on the closet door. That can be expensive and needs to be done by an HVAC professional. It is very important to get the proper amount of combustion air. Combustion air to the gas furnace for it to operate properly and safely.

Gas Furnace is Making Too Much Noise | Diagnosis and Repair - Conclusion

There may not be enough room to run this ductwork and in that case, you may be stuck with the noisy gas furnace. At least until it comes time for a new gas furnace and then you can look at having the new gas furnace moved to another location away from the bedrooms. Good luck and I hope this helps the gas furnace making too much noise Jenny!

High Performance HVAC

Gas Furnace is Making Too Much Noise | Diagnosis and Repair

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