Danbury is a very high cost-of-living market — pricing guide and permit rules below.
Danbury hvac rates: $5,000-$18,000 per system. Danbury's freeze-thaw cycles stress systems. Always get 3 written quotes and verify CT licensing at Connecticut DCP (portal.ct.gov). Sales tax on materials: 6.35%.
Danbury requires permits when work exceeds $200 or involves full system replacement. Your licensed contractor pulls the permit — if they ask you to pull it, that's a red flag.