True but 3 1/2 ton system today is probably 12-18 grand to install think my boss paid 14 last season. that being said you will save a bit on billsI replaced a aging system in 2018 with a 95% effecient nat gas furnace and 16 seer AC.
system it replaced was installed in 1998. Night and day difference in performance and energy costs. These days thats nothing to walk away from.