Boston is a very-high cost-of-living market — pricing guide and permit rules below.
Boston hvac rates: $3,000-$10,000 per system. Always get 3 written quotes and verify MA licensing at Massachusetts OCABR (mass.gov). Sales tax on materials: 6.25%.
Boston requires permits when work exceeds $1,000 or involves full system replacement. Your licensed contractor pulls the permit — if they ask you to pull it, that's a red flag.