re: Central A/C thread

410A would most likely need an evaporator coil replacement ($1500.) unless your coil is less than 10 years old. If you have a gas furnace in your attic it would be the box above your overflow pan. If you have electric heat it is probably part of your coil/blower and, if not available, you would need to change the electric air handler unit($2200.)...unless less than 10 years old. If you go with the dry charge or freon 22 unit there would be no retrofit needed later on ....just change the coil and possibly the metering device and you are good to go.

The advantage you have with the 410A system is efficiency....you can reach up into the 20 SEER (seasonal energy efficiency rating) as opposed to the max of 13 you achieve with the freon 22 system. This means a smaller utility bill each month...but unless you are ready to spend the money to go to at least a 16 seer system....go with the freon 22 or dry charge condensing unit and save the money.