I had the HVAC guy out to add some freon to the AC. Our system is 14 years old and were told that the expected life is 12-15 years. The sales guy came out and quoted us $10K+ on on a new Lenox high efficiency system with a 2 stage A/C. I about choked and told him that was way too much. I estimate the the expected savings to be around $20 a month. He is going to call the supplier and see if he can find any deals on excess inventory items. Should I really be considering a new system? I have Carrier funrnace and A/C unit that was installed in 1998. What should be a reasonable price? My house is about 2,200 sq feet. I think the A/C unit is around 2.5 ton. My contractor grade sytem is 14 years old and I am happy with the way it has worked. Is it really worth ugrading to more deluxe system?