"Called them for Heat Pump Maintenance in Hicksville and they were fast and did a very thorough work."
Sucharu Subedi
Hicksville, NY · Heat pump maintenance
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 available
Fully insured
Local crews, fast response
About HVAC service in Syosset
Syosset has the largest average home size in our service radius, and the engineering follows from that — multi-zone systems, two-system houses, and load calculations where a rule-of-thumb guess is expensive in both directions. Lots are big enough that equipment placement is rarely the constraint; sizing is. ZIP 11791, 5.4 miles from our Levittown shop.
Complete service menu
Every HVAC service we offer in Syosset
All 13 services available across Syosset — usually same-day for repairs, free in-home quotes for installs.
AC Repair in Syosset
cooling · repair
Same-day cooling repairs most days 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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Heating Services in Syosset
heating · repair
Furnaces, boilers, and heat pumps — repaired, serviced, replaced.
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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 repair, cleaning and installation — steam, gas & combi.
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Heat Pump Installation in Syosset
heating · install
Heat pump repair and installation — ducted & ductless.
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Water Heater Installation in Syosset
heating · install
Tank, tankless, and heat-pump water heaters — installed right.
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Whole-Home Generator Installation in Syosset
heating · install
Standby power sized and installed on Long Island.
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Emergency HVAC Repair in Syosset
heating · repair
No heat. No AC. No waiting.
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Emergency Boiler Repair in Syosset
heating · repair
Cold radiators. Leaking boiler. Call any hour.
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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
- Bonus rooms bake — Finished attics and rooms over garages in Syosset homes collect heat and sit at the end of long duct runs, so they stay warm whatever the thermostat says.
- No central cooling at all — Some older homes around Cold Spring Road are heated only by hot water and rely on window units, which are noisy and uneven in a house this large.
- Builder-grade condensers wearing out — Condensers installed with 1990s colonials are reaching end of life. They lose capacity, run constantly in heat waves and fail when demand is highest.
- Uneven floors in large homes — Big Syosset layouts with additions rarely cool evenly, so one floor feels fine while another lags behind.
Winter in Syosset
- Unbalanced hydronic zones — Baseboard zones added over the years in Birchwood and Stillwell Woods homes can heat unevenly, leaving some rooms cold while others run warm.
- Cold rooms at duct ends — Long runs in a large Syosset house mean weak winter airflow to the farthest bedrooms, even when the furnace itself is working fine.
- Zone valve and circulator failures — Boiler zones depend on valves and circulators that wear out. When one sticks, a single wing of the house goes cold.
- Chilly finished basements — Basements finished after the original build often have thin heat supply, so the lower level feels cold underfoot all winter.
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. 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, and startup. $0 down on approved credit.
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. PSEG Clean Heat takes a flat $4,000 off a qualifying whole-home heat pump — $5,000 for moderate-income households, $7,500 income-qualified.
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
- Fully insured, EPA 608-certified technicians
- Full scope in writing before you sign
- 1-year warranty on every repair · up to 10-year parts on installs
EPA 608
Every technician
24/7
Emergency dispatch
Fully
insured
COI on request
⌖ 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
$199–$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 on approved credit
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
"Had my furnace maintenance done and I’m very happy with the service. The technician was friendly, professional, and took the time to check everything carefully. He explained what he was doing and made sure the furnace was running properly before he left. I’m in Hicksville and it’s nice to find someone local who is reliable and does good work. I would definitely recommend them for furnace maintenance or HVAC service."
Narendra Subedi
Hicksville, NY · Furnace maintenance
"I had a fantastic experience withLong Island HVAC Repair! My ac system was struggling to cool and I noticed a frozen line near the unit. I called for an emergency repair and they were at my home in 90 mins. The technician was professional, quickly located the leak, and had the system running perfectly in no time. Highly recommend for any local Levittown heating repairs!"
Pabitra Pun Bhattarai
Levittown, NY · Emergency AC repair
FAQs
Syosset HVAC questions, answered
Is a cold-climate heat pump realistic for my large Syosset house?+
Often, but size and layout decide it. A big Syosset home needs a load calculation before anyone picks equipment, because heat pumps are sized to the house, not to the old furnace. Many owners can skip a backup furnace on most days, and we say plainly when one still makes sense. Ducts and panel capacity get checked first.
Why is the bonus room over my Syosset garage always hot or cold?+
Rooms over garages have exposed floors, thin insulation and often a duct branch at the very end of the run. In Syosset that usually means weak airflow plus heavy heat gain. Fixing the duct branch can help, but a single ductless head frequently handles the room without disturbing the main system.
Our Syosset house has two systems. Should both be serviced at the same visit?+
Usually yes. In two-system Syosset homes the upstairs unit often works harder and wears differently, so we check both condensate drains, filters and refrigerant readings side by side. Comparing them shows which one is drifting before it fails in a heat wave, and one visit costs you less time than two.
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 Syosset addresses usually 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 credentials and insurance do you carry in Syosset?+
We're fully insured for residential HVAC work in Syosset and across Long Island, and our technicians are EPA 608–certified. We provide current insurance and certification documentation on request.
How much does AC or furnace repair cost in Syosset?+
Our diagnostic visit in Syosset is a flat $199, waived when you approve the repair. Most common AC and furnace repairs — capacitors, ignitors, flame sensors, contactors, blower motors — run $180–$650 all-in with upfront flat-rate pricing before any work starts. Bigger jobs like refrigerant leak repair or a blower replacement are quoted on the spot, and if a repair no longer makes sense on an older system we'll show you repair-vs-replace numbers side by side.
Do you offer financing for Syosset homeowners?+
Yes — through Synchrony Home Financing. Syosset homeowners can apply for $0 down on approved credit, with monthly plans and full terms in writing before you sign.
What rebates can I get on a new system in Syosset?+
Syosset is in PSEG Long Island's service territory. PSEG runs incentive programs for qualifying cold-climate heat pumps and high-efficiency central AC; amounts and eligibility change by program year and household income, so check PSEG Long Island's current terms before you buy.
Dedicated Syosset service pages
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.