You will never get the efficiency if you do not change that coil. You need to make sure they change the inside coil to match the outside unit. But that's the reason why you have a qualified tech install and service the equipment. I have found that the 410A has a better temp split across the coil than the R22 and yes it will have problems if you get moisture in it(just like the R22). Yes 410A does run under higher pressures but the equipment is made for it. This in and of itself is enough to cause problems with R 410 until everyone understands what has to be done to use it properly.Check again the dates you gave are wrong R22 is on its way out. Most HVAC people never pull a proper vac on a system to remove all the moisture and to make matters they never flow nitrogen while brazing the unit together. At the University my class had tested both for major manufactures and as of right now if it is my home I will stick with R 22. It also just loves to suck up water which can cause major problems. R 410 is OK but a much higher pressure refrigerant. It will be available for many years after that. R-22 will be around till 2010 in new equiptment.
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