Why Does My New AC Make So Much Noise Inside My House?

Welcome, my friends! Today, let’s talk about a common issue that many of us face with our air conditioning systems: excessive noise. Picture this – you come home after a long day, expecting to enter a calm and peaceful environment, but instead, you’re greeted by the sound of a roaring beast. Your air conditioner is making a racket, and it’s driving you crazy. But fear not, because I’m here to shed some light on why this might be happening and how you can find a solution.

The Culprit: Improperly Sized Ductwork

One of the main reasons your air conditioning system might be noisy is due to improperly sized ductwork. If the supply or return ducts in your home are too small for the unit, it can lead to air noise. Think of it like this – the smaller the ducts, the higher the velocity of the air flowing through them. And as we all know, the faster something moves, the louder it gets. Many older homes, built before 2000, often have ducts that can’t handle the volume of air that modern systems deliver.

Diagnosing the Noise

To determine whether the ductwork is indeed the cause of the noise, we need to run some diagnostic tests. Several factors could contribute to the excessive noise, such as the blower motor’s location or improper wiring in the air handler. Additionally, any restrictions in the ducts can create noise issues. By measuring the airspeed and static pressure, we can identify if the velocity is above 400 FPM (feet per minute), which indicates a noise problem. Remember, faster air equals higher pressure and more noise.

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Finding the Solution

The good news is that noise issues can often be resolved relatively easily. In some cases, adding or modifying supply and return air ductwork can slow down the air and decrease static pressure, alleviating the noise problem. However, in other instances, a complete duct system replacement might be necessary, depending on the style of ductwork and the age of the system. It’s always a good idea to seek the assistance of a certified HVAC technician to help you address any noise concerns and restore the peace and quiet you deserve.

Now, before I wrap up, let me digress for a moment. Speaking of velocity, can someone please email me the airspeed velocity of an African swallow carrying a coconut? My fellow Monty Python fans will understand this reference. Until next week, I firmly believe that a good pun is a reward in itself.

House Whisperer out!!


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