My old 2 ton York R22 XB1000 has died too many condenser coil leaks. I guess I need to replace it with an R-410A system, condenser unit, and air handler? My circuit breaker is 30 amps. The line distance from the condenser location outside, lines buried in the walls of the 2 story condo and up into the attic where the Trane furnace is is about 40 feet. Ideally, I'd like something larger, maybe 2.5 tons. The air handler box on top of the Trane measures (outside dimensions) 30.125 tall x 20.375 front to back x 14.625 wide. Is it easy to find a drop in 410A evaporator coil? Any other issues I have to consider other than flushing the lines (maybe line diameters)? I have all the tools to install, evacuate, charge and test.

I had a tech come out yesterday to take a look at my 13 year old Heil ac system. It has 2 zones - upstairs and downstairs. There are return vents in every single room. The reason I made the appointment was because it wasn't cooling that well during the middle of the day. He added 2 pounds of R22 and couldn't find any obvious leaks. He thinks it's likely very small since the previous homeowners never had to add refrigerant in 13 years (I have the service records). Hopefully I'll get a few more years out of my system. The supply air is definitely cooler now and the house definitely is reaching the set temperature more quickly. Anyway, we got to talking about the temperature settings on the thermostats and he suggested that the upstairs be set to be 2 degrees cooler than downstairs since cooler air will naturally drop, and it would create a comfortable environment throughout the house. I noticed that when both zones are calling for cooling, it heavily decreases the airflow coming out of the upstairs registers, so this should help with airflow since the downstairs zone would call for cooling much less. Thoughts? I changed the settings to 74 upstairs and 76 downstairs, and while away 78 upstairs and 80 downstairs.