We are getting quotes to replace our 23 year old upstairs AC and furnace. We are being quoted different brands but they are pretty much:
2 ton 15 SEER dual fuel system with 80% efficiency furnace with variable speed drive.
We are in the Atlanta area and the unit is upstairs so the 80% furnace should be fine as we don't expect it to fire very often.
My question is on the coolant lines. Some contractors say our current lines are fine and others say we need to replace them with larger lines.
Current lines are 1/2 inch and 1/4 inch I believe. Quotes that say to replace them have us putting in 3/4 inch and 3/8 inch lines.
Are the new larger lines necessary? The old lines are fine as far as condition goes, the quoted need is all about the size.