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Question DetailsAsked on 9/8/2016

is 410a the same asr22 and does it work you have to remover r22 or can it be put in with it

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1 Answer


No - do NOT mix. And generally, especially in newer units, the unit itself is not rated or designed for use with the other gas - will work properly with only the gas it is designed to run with, or with R-22 units there are a few replacement gases that can be used with some degradation in cooling efficiency, though generally they are not signficantly cheaper than R-22. In addition, the lubricating oil (which is mixed with the gas) is almost always significantly different, so even if putting in another compatible gas, the lines have to be flushed with a solvent to remove the R-22 lubricant (usually mineral oil) before putting in the new gas. Plus on units that can use more than one type (pretty rare), the TXV or TCX or similar control valve needs to be adjusted (if adjustable type) or replaced to run the unit at the correct operating pressures for that gas and unit.

On the units that can run with R-22 and R-410a - using R-410a will generally result in about a 15-25% reduction in cooling efficiency - meaning your A/C bill will go up by a quarter or a third or so for the same ambient conditions, so even if it will handle it commonly getting a new, more efficient (and newly warrantied) R-410a unit can be more economic in areas where an A/C sees fairly heavy use.

And yes R-22 is still available (to properly licensed HVAC professionals) and will be for several years more, for use in existing R-22 units only.

Here is a previous similar question with answers in more detail -

Answered 3 years ago by LCD

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