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Define "older model". Up to the early 90s, they used R-12/CFC-12. Good luck trying to get that anymore. R414B is the recommended replacement for R12 systems.

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Q: What type of freon should be used in older model ac units?
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yes, older units could take between 9 and 15 lbs of freon most take about 12


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There is no set amount required by different AC units, it may be listed on the mfg. tag on the unit but that is just the factory charge and may be different for lines over 25 feet. The freon in older home units is R-22 and isn't avilable to non licensed people. If your unit needs freon, it leaked out. someone should find the leak and give a quote on fixing it. If you are not licensed, it is illegal to sell you freon for private use. It is best to pay someone to take care of this task and then you will be more certain of having a working air conditioner. They have the training and tools to do a proper job.


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