Replacing a York 10 SEER heatpump with a 14 SEER American Standard. Customer doesn't want to change out air handler,told him he would get less effiency than 14. He is fine with that he just wants outside unit changed for now. York is an old unit. He showed me a paper that another company sent him saying that the line set size would be different for a 13 SEER than a 10 SEER. I checked and a 1.5 ton unit is the same size line set no matter what SEER rating. Company letter stated he would have to change line set and that would mean ripping out the inner walls,costing much more money. Condo rule no outside line sets. So before 2006 that they better change their old units in for a newer unit.
My question is, will I run into trouble with anything by having an American Standard with a York inside unit? Wiring? By the way you should see all the new York heatpumps this other company has in this complex so far. I'm in New England and still can't figure out why we have some heatpumps up here anyway.