"Came out same day in 95° heat. Diagnosed a bad capacitor in 15 minutes and had us cool again before dinner. Fair price, super clean work."
Sarah K.
Garden City, NY · AC Repair
5.4 miles from our Levittown HQ
HVAC repair & installation in Syosset, NY
Syosset's larger colonials and contemporaries benefit from variable-speed inverter systems. We design for quiet operation and consistent room-to-room temps — no more cold bedrooms. We bring trucks fully stocked with parts for every major brand serviced in Syosset, so most repairs are completed on the first visit.
Same-day appointments
Licensed & insured
Local crews, fast response
About HVAC service in Syosset
Long Island HVAC Repair provides licensed, same-day HVAC service to Syosset, NY (ZIP 11791) and surrounding neighborhoods like Birchwood, Stillwell Woods, Syosset Estates. From our Levittown HQ just 5.4 miles away, our NATE-certified technicians handle AC repair & installation, furnace and boiler service, heat pumps, ductless mini-splits, water heaters, and seasonal tune-ups — all backed by upfront flat-rate pricing and a 1-year warranty.
Complete service menu
Every HVAC service we offer in Syosset
All 9 services available across Syosset — same-day for repairs, free in-home quotes for installs.
AC Repair in Syosset
cooling · repair
Same-day cooling repairs across Long Island.
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AC Installation in Syosset
cooling · install
High-efficiency central AC, sized and installed right.
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Ductless Mini-Split Installation in Syosset
cooling · install
Room-by-room comfort with no ductwork required.
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AC Maintenance & Tune-Up in Syosset
cooling · maintain
Annual tune-ups that prevent breakdowns and extend equipment life.
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Furnace Repair in Syosset
heating · repair
Emergency furnace repair, day or night.
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Furnace Installation in Syosset
heating · install
High-efficiency furnaces that lower your gas bill.
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Boiler Repair & Installation in Syosset
heating · repair
Boiler installation on Long Island — steam, gas & combi.
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Heat Pump Installation in Syosset
heating · install
Year-round comfort with one efficient system.
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Water Heater Installation in Syosset
heating · install
Tank, tankless, and heat-pump water heaters — installed right.
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What we see in Syosset
Common HVAC issues by season
We regularly service Syosset year-round. Here's what tends to fail and when.
Summer in Syosset
- Failed AC capacitors — the #1 summer call. We carry every common size on the truck.
- Frozen evaporator coils from dirty filters, clogged returns, or low refrigerant.
- Condensate drain backups — Long Island humidity overwhelms clogged drain lines fast.
- Salt-air corrosion on outdoor condensers — especially relevant near Syosset.
Winter in Syosset
- No-heat emergencies — failed igniters, flame sensors, draft inducers. Same-day or 24/7.
- Boiler short-cycling — common on older oil and steam boilers across Syosset.
- Cold radiators or rooms — air-bound zones, failed circulator pumps, or stuck zone valves.
- Frozen condensate lines on high-efficiency furnaces during deep cold snaps.
Deep dive · Syosset
AC installation in Syosset, NY — what to expect
Most Syosset AC installs we quote fall into three buckets: swapping a 15–20 year old builder-grade condenser on a 1990s colonial, adding central air to a Birchwood or Stillwell Woods home that has hydronic heat only, or retrofitting a variable-speed inverter system into a larger contemporary. We size every job with a Manual-J load calc — not by matching what's already there — because Syosset homes have had additions, finished basements, and window upgrades that change the real cooling load.
Central AC swap-outs (Birchwood, Syosset Estates)
1990s–2000s builder-installed 13-SEER condensers coming off warranty. We swap to 16–18 SEER2 inverter systems on the same pad, reuse the copper line set when it's clean, and typically finish in one day.
New central AC (Stillwell Woods, older homes on Cold Spring Rd)
Older Syosset homes with only hydronic heat need new supply and return ducts. We map runs through the attic or basement to keep bulkhead work to a minimum — most jobs finish in 3–5 days.
Heat pumps for whole-home electrification
Syosset qualifies for NYSERDA Clean Heat rebates and federal 25C tax credits. We spec cold-climate heat pumps that hold capacity to 5°F, so you don't need to keep your old furnace running as backup on every cold day.
Ductless mini-splits for additions & bonus rooms
Bonus rooms over garages and finished attics in Syosset are notoriously hot. A single-zone ductless head solves it without touching the main system.
How much does AC installation cost in Syosset?
Below are typical installed prices in Syosset — final quote depends on load calc, line-set length, and electrical work.
2.5–3 ton central AC swap
$7,200–$9,800 installed. Covers a 16 SEER2 condenser + matching coil, refrigerant, permits, and startup. $0-down financing available.
New central AC (no existing ducts)
$14,500–$22,000 depending on square footage and duct routing complexity.
Cold-climate heat pump (2.5–3 ton)
$11,500–$16,000 before rebates. NYSERDA Clean Heat can knock $2,000–$5,000 off; federal 25C adds 30% up to $2,000.
Ductless single-zone (9k–18k BTU)
$4,200–$5,900 installed, including line set, electrical, and mounting.
Why Syosset chooses us
Local Long Island knowledge — not a national chain.
- Just 5.4 miles from your front door — fast trucks, low fuel surcharges
- Trucks fully stocked with common parts — most repairs done first visit
- Honest, upfront flat-rate pricing — no surprise add-ons after the work starts
- NY State licensed, fully insured, NATE-certified technicians
- We file PSEG and NYSERDA rebate paperwork on your behalf
- 1-year warranty on every repair · up to 10-year parts on installs
15+
Years serving LI
5,000+
Homes serviced
Licensed
& insured
NY State
⌖ HQ · Levittown, NY
9-mile radius
Syosset sits 5.4 miles inside our 9-mile service zone.
Transparent Syosset pricing
Real numbers, before any work starts
No surprise charges, ever. Syosset homeowners see the full repair or install price in writing first.
Diagnostic visit
$99–$199
Waived with approved repair
AC capacitor replacement
$245–$420
Most-common summer fix
Furnace ignition repair
$285–$595
Igniter, flame sensor, board
AC tune-up
$189
Spring-special pricing
Furnace tune-up
$209
Includes safety inspection
Central AC install
From $7,200
$0 down financing available
Final pricing in Syosset confirmed in writing after on-site diagnosis. No work begins without your approval.
Brands serviced in Syosset
We service every major HVAC brand
No matter what's installed in your Syosset home — we have parts, training, and dealer relationships for it.
CarrierTraneLennoxRheemGoodmanBryantAmerican StandardYorkMitsubishiDaikinFujitsuLGBoschWeil-McLainBurnhamLochinvarNavienBuderusPeerlessSlant/FinBradford WhiteA.O. Smith
What neighbors say
Long Island homeowners trust us
"Replaced our 1958 boiler with a high-efficiency condensing unit. Crew was meticulous — neat piping, took the time to explain everything. Heating bill dropped 30%."
Mike D.
Huntington, NY · Boiler Installation
"Mitsubishi mini-splits in three rooms. Quiet, efficient, and they handled all the rebate paperwork. Could not be happier."
Anna R.
Massapequa, NY · Mini-Split Installation
FAQs
Syosset HVAC questions, answered
Do you provide HVAC service in Syosset, NY?+
Yes — Syosset (ZIP 11791) is well within our 9-mile service radius. We're just 5.4 miles away, so most Syosset addresses get same-day appointments.
How fast can you get to my Syosset home for emergency service?+
For complete no-heat or no-cool emergencies in Syosset, our 24/7 dispatch typically gets a technician on the way within 60–90 minutes. Standard same-day service is available almost every day.
What HVAC services do you offer in Syosset?+
Every service we offer — AC repair, AC installation, furnace repair & install, boiler service, heat pump install, ductless mini-splits, water heater install, and seasonal tune-ups — is fully available in Syosset.
Do you service my brand of equipment in Syosset?+
We service all major brands in Syosset including Carrier, Trane, Lennox, Rheem, Goodman, Bryant, Mitsubishi, Daikin, Fujitsu, Weil-McLain, Burnham, Lochinvar, Navien, and more.
Are you licensed and insured to work in Syosset?+
Yes. We're fully NY State licensed and insured for residential HVAC work in Syosset and across Nassau County. We pull permits and coordinate inspections on every install that requires them.
Do you offer financing for Syosset homeowners?+
Yes — through Synchrony Home Financing. Syosset homeowners qualify for $0-down installs, 0% APR for 12 months on approved credit, and low-monthly plans up to 120 months.
What rebates can I get on a new system in Syosset?+
Syosset is in PSEG Long Island's service territory, so rebates of up to $1,000 on qualifying high-efficiency AC and heat pumps are available. NYSERDA programs add another $400–$1,200, and federal IRA tax credits stack on top.
Nearby service areas
Towns near Syosset we also serve
Need HVAC service in Syosset?
Call now and we'll dispatch a technician — usually same-day across Syosset and ZIP 11791.