R22 (also called HCFH-22) has been the standard refrigerant used in air conditioners for many years. The problem with this refrigerant is that it is both less efficient and less environmentally friendly than R410a refrigerant. The government-mandated shift away from R22 refrigerant is an attempt to make homes more efficient and reduce the emissions of greenhouse gasses into the environment.
As of 2010 R22 was no longer allowed to be used in newly-manufactured air conditioners. R-22 can not be added to current systems after Jan 2019. As a result of this, as air conditioners wear out and a are in need of repairs, home owners may be pressured into believing that they will have no choice other than getting a new system, a system that does not use R-22. However there is a replacement for R-22 that works very well and is compatible with older systems. It is MO99
MO99 is a refrigerant that can be used to replace R-22 and is has similar cooling ability. MO99 is non-ozone depleting. MO99 is compatible with traditional and new lubricants; in most cases, no change of lubricant type during retrofit is required. Minor equipment modifications (e.g., seal replacement) or expansion device adjustments may be required in some applications. Even with modifications and change in the oil using MO99 will be a better economic decision than getting an entire new system.
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