Central AC Replacement in Sagaponack, NY

If the house has sound ductwork, replace the central system: $3,500–7,500 for standard efficiency, $8,000–12,000 for high efficiency (national 2026), about a day of work. If it has no ducts, or a wing or floor the central system never reaches, go ductless: $2,000–8,000 for a single zone and $5,000–12,000 for 2–4 zones, half a day to 3 days of work. Many Hamptons houses end up with both: central air on the main floors, mini-splits in the attic, the addition and the pool house. Mini-splits also heat, which makes them the cheapest way to keep an empty house above the 55°F most insurance policies expect in winter.

Typical lives: central AC 12–17 years, air-source heat pump 10–15, ductless mini-split 15–20, gas furnace 15–20, oil boiler 20–35. Salt air shortens the outdoor half of that. Trade sources from other coastal markets claim an unprotected condenser within sight of the surf can fail in as little as 3–5 years and a unit 1–5 miles inland in 5–8 years without protection; we have not found a Hamptons-specific study, so treat those as warnings rather than measurements. What demonstrably helps: a salt-spray-rated or coated coil (some come at no extra cost on the right model), the unit raised at least 12 inches off grade, and a low-pressure rinse 2–4 times a year. The indoor equipment, boiler, furnace, air handler, lives its normal life.

Expect a $75–250 diagnostic visit (typically $89–149; $125–400 after hours or on a weekend), then the part. National 2026 ranges: capacitor $80–400, contactor $200–450, condenser fan motor $300–700, blower motor $450–2,000, control board $300–1,400, furnace ignitor $100–250, inducer motor $400–1,100, boiler circulator pump $300–1,100. The big-ticket repairs are refrigerant leaks ($250–1,200 for a small one, $1,200–4,000 with a new coil or line set), evaporator coils ($2,500–4,500+ out of warranty) and compressors ($1,100–4,650 out of warranty). Metro-area labor, which includes Long Island, tends to sit at the top of those ranges. On equipment past its typical life (central AC 12–17 years, heat pump 10–15), a major repair is usually money that belongs in a replacement.