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Never, an air conditioner is a closed system. If you need to add refrigerant you have a leak that needs to be repaired. In theory you should never have to add freon. but there can be some residual loss. maybe after five to ten years.

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Q: How often do you need to add freon to a central air conditioning unit?
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Related questions

How often do you need to replace freon in central air conditioning unit?

Never, unless you have a leak.


Do all home central air conditioning units need freon?

yes


Can you recharge house air conditioning with car air conditioning kit?

yes but you need to how much freon if may not be cost effective. Plus you need to know if it is the same type of freon.


How do you recharge the AC for your 2001 VW Passat?

You will need to connect your Freon bottle to the low pressure port on your 2002 Chevy Cavalier air conditioning compressor. Release the Freon into the compressor. A Freon recharge kit will come with everything you need and instructions.


How much freon recharge do you need on your previa?

The amount of Freon you will need to recharge your air conditioning system is dependent upon how low the Freon level is. You should begin with a one pound bottle of Freon.


What type of Freon do you need for your 2000 Mercury Mountaineer air conditioning?

134a


Why my Lebaron air conditioning compressor kicks off and on?

Low freon you need to recharge


How do you know when you need to replace the freon of a Nissan Xterra?

When your air conditioning isn't cold


Where does freon go?

In the automotive industry freon is used in the air conditioning system. You need to take your vehicle to a shop if the system needs to be recharged.


How often to change freon?

No need to.


Does central air conditioning need combustion air the way a furnace does?

If your referring to the cooling portion of your central air conditioning the answer is no.


Is it safe to use propane in a car air condition system?

NO! You would never put propane in an air conditioning system! For air conditioning to work it needs FREON. Depending on your car you need to find out what kind of freon it requires, as well.