This is an exciting time to be in the HVAC/R business. Under the mantel of energy efficiency for the sake of the environment we contractors are going to get a shot at a lot more high end business. The only problem is(soon to likely be discovered by the buying public I suspect) the HFC refrigerants which run these new machines are huge greenhouse gases. And, the political process, which is closing in on carbon emissions, has already figured it out. By next year expect HCFC and HFC refrigerants with GWP's above 100 to start costing much much more. So far the only defense proposed by the Industry(which is by the way a good start) is to tighten up these systems and promote recovery and reclaim. Currently less than five percent of all refrigerants are being reclaimed. We're talking about Big changes in recovery practices to do any good. And with the higher pressures, so likely more leaks. At least one of the equipment manufacturers have been claiming for some time that R410a systems will leak less than R22 systems because they are more beefed up including compressors, coils, expansion devices, etc. Maybe they are, but, a recent R410a class I attended for another manufacturer made clear that at least that manufacturer was using the same evaporator coils for both R22 and R410a. Duh. We all know that evaporator coils are big leakers.