Because in this article, we deliver authentic information regarding your air conditioning systems based on our research data collected by our competent team.

ac making hissing noise
In the technical sense, the hissing sound normally signals a refrigerant leak, but you will keep listening to this sound even after turning off your unit in such a case. If not treated on time, these leaks can significantly impact your health and wallet.

Ac Makes Hissing Noise - The Reasons

Sometimes, a hissing sound can be an alarming signal for a serious condition of a refrigerant leak. Still, there can be other minor reasons as well that could cause your air conditioning unit to produce this particular sound. For instance, if your AC makes a hissing sound while it's working, the reason can be found in the ducts. This is not a serious issue, and we recommend you fix it only if it causes serious irritation.

Ac makes a loud noise when starting - Troubleshooting Ideas
Summer holidays are the best opportunity for family reunions, barbecue parties, and watching movies together at home cinemas. While hanging out during summer, you will desperately feel the need for an air conditioner to deal with the hotness of weather conditions.

Another case deals with the hissing sound from your refrigerant and telling you that you need to fix the leakage in it. We will tell you that this issue is the major one and you need to worry about it. Keep reading to explore more about fixing the hissing noise.

Checking Out The Hissing Sound

Before examining it properly, it is hard to say the reason for the hissing sound. It might come from any of the following sources, in general:

  • Internal Valve
  • Refrigerant
  • Ac Ducts

That is why we normally recommend our readers get professional help from HVAC experts to save their time, money, and efforts at the expense of a few bucks.

Dangers Of An AC Leak

Dealing with faulty air conditioners, especially when their refrigerants are leaking, has never been an easy task. Rather, it requires certified professionals to fix the issue. Refrigerants use a special type of gas that is not harmful in small quantities, but in larger quantities, it can harm your health and environment simultaneously. Common symptoms to watch out for in this regard are given as follows:
  • Any issue is occurring to your throat, eyes, or mouth.
  • In case of excessive vomiting.
  • Nausea, Coughing, and Dizziness.
  • Not a recurring headache.

You might feel one of these symptoms if your air conditioner leakage is not caught on time. In this way, it will not only harm your health but also cost you a lot of money and sometimes a new air conditioner.

Identifying A Refrigerant Leak

Freon is a gas used in refrigerants widely around the globe, but the issue with this gas is its odorlessness which means we cannot smell it for identification. The ways by which you can identify a refrigerant leak are given as follow:
  1. Feel if your conditioner is cooling or not.
  2. Listen To the gurgling sound.
  3. See if there is ice on the line of your refrigerant.
  4. Check for the higher electrical bills.

Right Time To Get Professional Help

We have briefly explained the health hazards and other difficulties you will face if you avoid fixing your leaked refrigerant on time. Our recommendation would be to fix it immediately and to get help from a competent professional to fix the leakage perfectly.

Repairing cost: This issue costs around $250 to $1000.

See Our Blog: Is Water Leaking From Air Conditioners Dangerous? - A Guide

Home Repair Is Illegal

It would help if you pondered on this point, as getting your refrigerant leak repaired at your home is illegal. It is illegal because it should be done perfectly at the workshop to avoid unwanted conditions where it should be rechecked twice before returning to your home.

Learn To Prevent The Leaks

To prevent any malfunction In general and refrigerant leakage in particular, we recommend you get your system checked annually by professionals to maintain its working capacity and health for the greater good and long-lasting comfort.

Frequently Asked Questions

How do I fix the hissing noise in my AC?

Here are some tips to follow if you want to fix the hissing sound in your car AC:

  • First, you must find the low-pressure line service port for the refrigerant lines.
  • You need to attach the AC repair seal gently.
  • Remove the wall handle on the refrigerant recharging hose.

Is AC hissing normal?

Yes, in some cases, some air conditioner hissing noises are completely normal. Assume that the thermostatic expansion valve is a part of your AC that helps release pressure from the refrigerant.

How do I know if I have a refrigerant leak?

If you notice any of the following symptoms, it means that the refrigerant is leaking:

  • If hot air is coming out of your vents.
  • The evaporator coil is frozen.
  • The outdoor unit produces a hissing sound.
  • The unit consumes more power than usual.

How do I know if my AC is low on refrigerant?

Here are some signs to know if your AC unit is low on refrigerant:

  • It takes a long time for the unit to cool your home.
  • The vents are not blowing cold air.
  • The desired temperature you set is never reached.

Final Words

To summarize the whole discussion, we can conclude that if your AC unit produces a hissing or bubbling sound, it could be due to refrigerant lines, internal valve leakage, or some serious problems with the compressor. In some cases, a hissing sound from some AC units is normal because it is caused by the operation of the thermostatic expansion valve.

A thermostatic expansion valve is an integral part of an AC unit that helps release pressure from the refrigerant. If the unit is blowing hot air, it could be due to a liquid or gas leak in the refrigerant, which turns the warm air in your home into cold air.


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