Updated for 2026 · Nassau & Western Suffolk
Central AC replacement on Long Island runs roughly $5,800 to $18,500 installed in 2026, furnace replacement $4,900 to $12,400, boilers $8,500 to $19,500 and tank water heaters $2,100 to $5,200. Below is the full breakdown, plus the five factors that decide where your home lands in each range.
Installed pricing on Long Island reflects tonnage, SEER2 rating, electrical work and how much of the existing duct system can be reused. Every band below assumes an install sized with a Manual-J load calculation.
| Work performed | 2026 range |
|---|---|
|
Central AC replacement — 2 to 3 ton, entry SEER2
Straight swap on serviceable ductwork, new line set connections and pad. |
$5,800 – $8,900 |
|
Central AC replacement — 3.5 to 5 ton, mid SEER2
Larger colonials and split-levels; usually includes coil, drain and disconnect upgrades. |
$8,900 – $13,500 |
|
High-efficiency / variable-speed system
Inverter compressor, communicating thermostat, zoning-ready airflow. |
$13,500 – $18,500 |
|
Ductless mini-split — single zone
One indoor head plus outdoor condenser; ideal for additions and dormers. |
$4,200 – $6,500 |
|
Ductless mini-split — 3 to 4 zones
Multi-zone condenser, line-set hides and individual room control. |
$11,500 – $19,000 |
|
Common AC repairs (capacitor, contactor, blower motor)
Capacitors and contactors sit at the low end; ECM blower motors and coils at the high end. |
$185 – $1,450 |
|
AC tune-up / precision maintenance
Coil cleaning, refrigerant verification, static-pressure and amp-draw readings. |
$149 – $249 |
Long Island's mixed housing stock means gas furnaces, oil-to-gas conversions and hydronic boilers all live on the same block. Venting, chimney liners and gas-line sizing drive most of the spread.
| Work performed | 2026 range |
|---|---|
|
Gas furnace replacement — 80% AFUE
Same-vent replacement with new plenum transitions and safety controls. |
$4,900 – $7,800 |
|
Gas furnace replacement — 96%+ AFUE, two-stage
Adds PVC intake/exhaust, condensate handling and variable-speed blower. |
$7,800 – $12,400 |
|
Gas boiler replacement — cast iron
Near-boiler piping rebuilt to spec, new circulator and low-water cutoff. |
$8,500 – $13,000 |
|
High-efficiency condensing boiler
Modulating burner, outdoor reset control and stainless venting. |
$12,500 – $19,500 |
|
Heat pump (cold-climate, ducted)
Handles heating and cooling; usually paired with a backup heat source. |
$12,000 – $22,000 |
|
Furnace or boiler tune-up
Burner cleaning, draft test, CO check and control verification. |
$169 – $279 |
Tank swaps are predictable; tankless pricing depends on gas-line capacity and venting runs. Expansion tanks and code-required pans are included in the bands below.
| Work performed | 2026 range |
|---|---|
|
40 – 50 gallon gas tank water heater
Includes haul-away, new flex connectors, drain pan and expansion tank. |
$2,100 – $3,400 |
|
75 gallon / high-recovery tank
For large families and multi-bath homes with simultaneous demand. |
$3,400 – $5,200 |
|
Tankless water heater
Gas-line upsizing and stainless venting are the usual cost drivers. |
$4,600 – $7,900 |
|
Water heater repair (thermocouple, valve, element)
Worth doing under roughly 8 years old with no tank corrosion. |
$225 – $750 |
These are the line items that decide whether a new system actually performs. On older Long Island homes, undersized returns are the most common comfort complaint we correct.
| Work performed | 2026 range |
|---|---|
|
Duct sealing and return upsizing
Priced from the static-pressure reading, not by guesswork. |
$950 – $3,800 |
|
Two-zone damper system with controls
Fixes the classic hot-upstairs, cold-downstairs split. |
$2,400 – $4,900 |
|
Whole-home media air cleaner
MERV 13-16 filtration cabinet sized to your blower. |
$850 – $1,700 |
|
Whole-home humidifier
Bypass or steam, with humidistat control. |
$700 – $1,450 |
Diagnostic visits are quoted when you call — ask about current promotions. These are installed ranges for Nassau County and western Suffolk homes, including equipment, labor and haul-away. They are planning figures, not a quote — your written price comes from an on-site load calculation and duct assessment, and it does not change afterward.
Long Island homes have been re-insulated, re-windowed and extended. A Manual-J load calculation routinely lands a half to a full ton below the equipment being replaced, which lowers both equipment and operating cost.
A high-efficiency system on restrictive ductwork never delivers its rating. We take a static-pressure reading before quoting so duct work shows up as a line item instead of a surprise.
Condensing equipment needs new intake and exhaust runs; larger tonnage may need a breaker or disconnect upgrade; tankless units often need a bigger gas line.
Attic air handlers, crawl spaces and tight Levittown-era utility closets take longer than a garage or basement install, and that labor is real.
South Shore installs from Freeport to Massapequa benefit from coastal-coated coils and elevated pads — a modest upcharge that adds years of condenser life.
Get the tonnage and BTU range your home needs, plus the matching installed price band.
Open the calculatorScore your repair quote against replacement cost, system age and refrigerant type.
Open the calculatorFree estimates on installations, with a room-by-room load calculation and a written price that holds. Same-day diagnostics available across Nassau and western Suffolk.
