We will be replacing our 4 year old R22 AC system with a new properly sized system (total tonnage is going down). We currently have 2 separate systems (ductwork, outside units and air movers) rated at 3 Ton and variable speed fan units servicing our 3,200 sq. ft house.
The contractor will be replacing the outside units with R410A units, sized correctly. What else do I need to change? Do I have to change the coil units in the air handlers? Can I keep the same coolant lines or do they have to be replaced as well?
Thanks for your advice.