The majority of HVAC installations dating back to the 1990s have R-22 as their main working fluid. However, recent studies have proven that R-22 or as we commonly known as “Freon” (brand type) is not as environmentally friendly as we once thought it was. Ergo the use of this refrigeration type has been banned by the Environmental Protection Agency along with other substances which contributes to ozone depletion. With phasing out of R-22, HVAC manufacturers and end-users are forced to look into other comparable refrigerants which won’t negatively impact the environment as much.
R-410A offers a few benefits when compared to the traditional R-22 fluid – one of which is greater energy efficiency which translates into lower operational costs. This hydro-fluorocarbon has been approved for use in new systems and is classified as a non-ozone-depleting HFC. One note that has to be taken into consideration is that R-410A operates on roughly a 50% higher pressure than R-22, thus can only work with high pressure limit equipment.
R-407C has been set as the new standard for the U.S residential air conditioning system as of two years ago. Consequently, the commercial refrigeration system (including air conditioning and chilling units) R-407C was found to be the most frequent refrigerant to be used as a substitute of R-22. Of the higher temperature this type of refrigerant gives similar operating characteristic to R-22. R-407C, a non-ozone-depleting substance, gives better performance in comparison to Freon due to its higher pressure and refrigeration capacity.
R-134A is currently one of the most common refrigerant fluids; especially in HVAC applications in the automotive industry. Many machines are retrofitted to match this fluid from R-22; though one should be careful not to mix and cross contaminate R-22 with R-134A which can result to danger of raising compressor head pressure as well as unfavorable reliability. R-134A is made of one single component, which comes with the advantage of utilization of a single recovery machine and adding into that, according to recent studies, R-134A is environmentally friendly which makes it an even more attractive choice.