I live in the Southeast.
I have a 97 Janitol heat pump that ran out of freon this summer. I was told there were leaks in the inside and outside unit coils. We refilled the freon about 3 or 4 years ago. This time were told to replace the coils but I wonder if this is a slow leak if this is necessary? Does it damage the unit or its efficency when it runs low?
A new coil is about 1/5 the cost of a whole new unit with a SEER of 14 and the new type of freon (pruorn?) At that ratio are the savings of a new unit more cost effective?
If I get a new unit with a 10 year warranty and it develops a leak with the warrranty cover a new coil or just more coolant.
Finally in terms of quality and durability is there much difference between Goodman, Amana and Carrier?