need your advice as i can't make up my mind.
i have a 12 yr old gas lennox pulse 21 furnace and a lennox a/c unit (split). the furnace will need to be replaced because it's loud, in need of repair etc. a/c unit works fine it's a 12 seer.
the new furnace will be carrier infinity 95 % efficiency, price is reasonable and i decided to definitely replace it. question is this...would it be advisable/smart to also replace the 12 yr old lennox a/c. again the unit works fine and not probs with it. if i were to replace i would go with carrier infinity a/c 17 seer.
the hvac installer says if the a/c works fine i shouldn't replace it just yet, basically wait for it to start giving me probs. what do you think.
thank you for your opinions.