Is Puron (R410A) more efficient than R22? Local A/C contractor I spoke with says model for model (scroll compressor in each), the Puron unit is more efficient than the R22 equivalent unit. My understanding is since 410A works at higher pressures, it is actually more expensive to run than an R22 unit. The contractor responded by saying the 410A refrigerant is more efficient than R22 and therefore 410A units are less costly to run. He did say it takes less R410A to do the same job R22 would need, is that true too? Now I'm confused. Gurus?...what do you say?