Why is my AC making a hissing noise? 

A hissing noise inside your HVAC system should not be overlooked. Among the probable causes are leaking refrigerant lines, an internal valve leak or a serious problem with your compressor. If the hissing noise is heard from your air ducts, then you might have leaky air ducts. This is annoying, but not necessarily a cause for alarm. A hissing sound could indicate any of these things, but we’ll try to narrow it down further. 

Does the hissing sound end after a few seconds? 

If you hear a hissing noise that ceases after a few moments, you may not have any problems. That might be refrigerant in your expansion valve, which is part of the normal day to day operation of your HVAC system. 

Is the AC Making a Hissing Sound with Bubbling Noises? 

Are you hearing a bubbling sound paired with a hissing sound? This may indicate a refrigerant leak. If a refrigerant leak develops, you may hear a light hissing sound as the refrigerant escapes from the leak. Refrigerant escapes as a gas and can be a worrisome health concern. If you have signs of a refrigerant leak, turn off the AC and call a professional HVAC company to come take a look. 

If the problem is a valve leak, it should be repaired by a technician as soon as possible. The job of the valves is to regulate the pressurization of the refrigerant gas and without repair, the leak will worsen. When it does, the hissing sound will increase, which can be a sign if you’re looking for a cause. You must maintain adequate pressure in your system for it run as intended, and refrigerant leaks cause additional health and mechanical problems. You ought to get this fixed post haste if possible. 

Are Hissing Noises Coming from the Compressor? 

The compressor is located in the exterior air conditioning unit, which is also called a condenser. Listen around here for the hissing noise. If you find the compressor is the problem, this could be a dangerous situation because it is an indication that the pressure inside the compressor is too great. If you hear hissing, whistling, or shrieking coming from your compressor, power down your air conditioner without delay and call a professional technician. 

Photo of AC unit showing location of compressor

Compressors are some of the most costly parts to repair or replace inside an AC. Compressors are the part responsible for pushing refrigerant through the system. You cannot run an AC and cool your home without a compressor. The expense is variable based on factors such as the type, unit size, and brand requirements. If you have a two stage compressor now, you would need to replace it with another two stage compressor. It’s not possible to upgrade or downgrade the compressor type – your unit has specific requirements for what components are installed and won’t accept substitutes. While it’s impossible to say how much a compressor replacement is because of the variable costs, the bill is frequently big enough to think about a replacement in older air conditioners. This is why it’s crucial to shut off the air conditioning and call a trustworthy HVAC company if you hear hissing sounds coming from the compressor. 

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