PO Box 258 Sycamore Avenue, Shrewsbury NJ 07702

I Hear a Hissing Sound from the Air Conditioner. What's Happening?

Any time you hear unusual sounds from your air conditioner, that’s a sure sign it’s time to call for professional service. If you need a reliable system that will get your home to the desired temperature quickly and efficiently, all parts of your air conditioner must be in proper working order. Not only are your energy bills at risk of increasing, components of your system may begin to fail and require costly replacements. A sure sign you have a problem: loud or strange noises. Take a moment to listen to your AC…one of the most serious of these noises is hearing a hissing sound from the air conditioner.

What Causes a Hissing Sound from the Air Conditioner?

A hissing sound can indicate that refrigerant is leaking from your unit. Refrigerant is a chemical blend that continuously cycles through your system. It’s contained within the coils of your AC as it absorbs heat from the air inside and releases the heat outdoors. Without the proper levels of refrigerant, your system may be struggling to cool your home.

But the reduced cooling capacity is only a part of the problem.

Other components of your air conditioner must work extra hard to keep up if refrigerant levels are low, which means those parts may wear down sooner than they’re supposed to.

What if I hear a Shrieking Noise from my AC?

Another issue that could be causing the hissing noise is from the compressor malfunctioning. If pressure inside is too high, you could face some serious problems. And if the hissing sounds turn to a shrieking noise, turn off the AC immediately and call the HVAC technicians at Lawes to find out what’s wrong and how to fix it.

What If It’s My Heat Pump That’s Hissing?

If you have a heat pump, the hissing noise could be coming from your reversal valve. Because this valve allows refrigerant to flow in the opposite direction, a heat pump is able to heat and cool your home. If this part is malfunctioning, professional repairs can diagnose the problem.

When Hissing Sounds Aren’t a Problem

Everyone’s air conditioner has normal operational sounds, one of which may be a short hissing noise due to refrigerant expanding in the expansion valve. As long as it only lasts a few seconds and then goes away, it shouldn’t be a concern.

Find out more about your home air conditioner, “It's Finally Spring: How to Tell If Your Air Conditioner Is Broken Before You Need It!

Air Conditioner Repair and Maintenance Checks

A hissing sound from the air conditioner can indicate a number of things. No matter what the exact problem is, it’s always best to have a trusted technician from Lawes to manage your HVAC repair.

For AC repairs and maintenance checks in Shrewsbury, NJ and surrounding areas, trust the dependable technicians at Lawes Home Comfort Specialists. Contact us at 732-741-6300 today to schedule your next appointment.

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