After much time and effort, I have chosen to have my 12 year old 3 ton poorly running system replaced with a new Carrier install. It will be a 3.5 ton which was determined by 4 separate HVAC techs. 2 guesstimated and 2 did the whole home insp but all said 3.5. I live in Central NC with 2000 sf with a bed and bath zoned upstairs.
I'm debating over which line to use based on cost and performance and would like to hear any suggestions.
Thank you all who take the time on this site to reply and share knowledge. I have learned allot over the last month.