just had installed carrier furnace(58mtb100-20) 2 stage 93% afue and a carrier a/c(24aba342a003) 3.5 ton 13 seer unit. the furnace runs incredibly loud. the tech from the same installation company came to slow down blower speed (to reduce noise) and he said that furnace at 5 tons was oversized and causing a/c turbulence. he also said some things about the salesman being stupid.
it blew out 2 registers, that were not secured very well.
finally, i guess my question is should i get different furnace?
i want the 2 stage.