I am going to replace a 12yr old janitrol 5 ton ac down here in So. Fla. Have pretty much narrowed it down to a rheem/rudd 12 seer unit. Wanted to go 14 seer but 1 ac guy told me that i would need to replace my 7/8" line with 1 1/8" to get all the benefits of the higher seer. Out of the 5 estimates I received for high seer rated units, he was the only tech to tell me that. So true or not?