Furnace Services Long Island | Repair, Replacement & Installation

Long Island Furnace Experts: Repair, Replace, Install & Tune-Up

Furnaces don't usually fail at convenient hours. They fail at 11pm on the coldest night of January. All Island Comfort has been keeping Long Island furnaces running since 2004 with NATE-certified technicians, fully stocked trucks, and a 24/7 dispatch line. Whether your furnace blew a flame sensor, tripped a high-limit switch, or simply hit the end of its useful life, we can fix it or replace it cleanly and at a fair price.

We work on every furnace type in residential service on Long Island, including gas, oil, electric, and propane. We also handle full oil-to-gas conversions, ductwork upgrades, and high-efficiency installations that qualify for NYS Clean Heat and federal tax credits.

Furnace Repair (All Brands & Fuel Types)
Furnace Replacement & New Installation
Annual Furnace Tune-Ups & Maintenance Plans
High-Efficiency (90%+ AFUE) Furnace Installation
Gas, Oil, Electric & Propane Furnaces
Ductwork Inspection & Repair
Smart Thermostat Installation
Indoor Air-Quality Add-Ons (HEPA, UV, Humidifiers)
Combustion Analysis & Safety Testing
24/7 Emergency Furnace Repair

Call 631-591-2289 any time for fast furnace service on Long Island, or request a written estimate online.

No Heat Tonight?

Most no-heat furnace calls on Long Island are dispatched within the hour. Our trucks carry common ignitors, sensors, capacitors, and motors so most repairs are done same-day.

Call 631-591-2289

Types of Furnaces We Service & Install

Furnaces fall into a few major categories by fuel and design. Each has different parts, controls, and quirks. We work on all of them across Long Island:

Natural Gas Furnaces

The most common new installation on Long Island where natural gas mains are available. Quiet, fast-recovering, and efficient. Modern gas furnaces hit 95% to 98.5% AFUE. We install Carrier, Trane, Lennox, Bryant, Rheem, and Goodman gas units.

Oil-Fired Furnaces

Common across Long Island where natural gas isn't on the street. Pair with a residential oil burner we service separately. Tough, long-lived, and capable of high-output heat. We service every major oil furnace brand and pair with reliable oil delivery.

Electric Furnaces

Used in homes without gas service or as backup heat for heat pumps. Lower upfront cost, simple controls, no combustion. Operating cost depends heavily on electric rates. We install and service electric furnaces and heat-strip backup units.

Propane Furnaces

Operate similar to natural gas but burn propane delivered to an on-site tank. Common in parts of Long Island that lack gas mains. We install and service propane furnaces, including conversions from oil where it makes sense.

High-Efficiency Condensing Furnaces

Modern 90%+ AFUE furnaces capture heat from exhaust gases that older furnaces throw away. Lower fuel bills, quieter operation, and often eligible for NYS Clean Heat rebates and federal tax credits. The best long-term value for most Long Island homes.

Furnace Repair

Whether your furnace isn't heating, blows cold air, won't start, or keeps shutting off, our experienced techs diagnose and fix any furnace issue across Long Island, including:

Furnace Won't Turn On / No Heat
Furnace Blowing Cold Air
Furnace Not Heating Enough
Short Cycling (Turns On/Off Rapidly)
Furnace Running Constantly
Pilot Light or Ignitor Failure
Tripped Flame Sensor
Failed Gas Valve
Condensate Drain Clog (90%+ Units)
Cracked Heat Exchanger
Failed Blower Motor
Failed Inducer Motor
Capacitor Failure
Limit Switch Lockouts
Loud Banging, Squealing, or Rattling
Tripped Circuit Breaker
Thermostat Problems
Dirty or Restricted Filter
Bad Smell from Vents
High Fuel or Electric Bills

How much will your furnace repair cost? A soft quote can usually be given over the phone, but accurate pricing is done in person, in writing, before any work starts. Cost depends on the type of repair, condition of the unit, parts required, and labor.

For furnace emergencies on Long Island, call 631-591-2289 any hour, day or night.

"Our 18-year-old furnace stopped working at 9pm on a Thursday. Tech was here by 10:30, diagnosed a failed flame sensor, had the part on the truck, and we had heat back before midnight. Charged us a fair flat rate, no after-hours markup."

Josh H. — Riverhead, NY ★★★★★

Furnace Replacement & New Installation

Furnace replacement is one of those projects that pays you back every winter for the next 15 to 20 years if it's done right. Pipe sizing, ductwork, venting, combustion-air calculations, and proper sizing all matter.

Signs you should replace rather than repair:

Furnace Is 15 to 20+ Years Old
Repairs Are Recurring or Expensive
Cracked Heat Exchanger
Rising Fuel or Electric Bills
Inconsistent Temperatures Room to Room
Loud Operation or Constant Noise
Yellow or Flickering Burner Flame (Gas)
Soot, Rust, or Corrosion on the Unit
Old Mid- or Low-Efficiency Unit (under 80% AFUE)
Indoor Air Quality Has Declined

Cost factors for new installation on Long Island:

Type (Gas, Oil, Electric, Propane)
Size in BTU (Based on Heat-Loss Calc)
Efficiency Rating (AFUE %)
Brand & Model (Single, Two-Stage, Variable-Speed)
Required Ductwork Modifications
Required Venting (B-Vent, Power, Direct, Sidewall)
Smart Thermostat & Zoning Add-Ons
Indoor Air Quality Equipment
Permits & Inspections
Removal & Disposal of Old Unit
Available Rebates & Tax Credits
Labor Hours & Access

We do real heat-loss calculations on every install. No oversized furnaces that short-cycle, no undersized units that struggle in February. Call 631-591-2289 for a free in-home estimate.

Annual Furnace Tune-Ups & Maintenance

Skipping annual furnace service is the single most common cause of mid-winter breakdowns on Long Island. Our 20-point furnace tune-up takes about 60 to 90 minutes and includes:

Inspect & clean burner assembly
Check & adjust gas pressure (gas units)
Replace nozzle, oil filter, pump strainer (oil units)
Check & calibrate ignition / flame sensor
Check flue, vent, and combustion-air paths
Run combustion analysis (CO, CO2, draft)
Inspect heat exchanger for cracks
Test high-limit and pressure switches
Inspect & clean blower motor and wheel
Lubricate moving parts (motors, bearings)
Test capacitor and amperage draw
Check & tighten electrical connections
Inspect condensate drain (high-efficiency)
Replace or clean air filter
Test & calibrate thermostat
Inspect ductwork for leaks (visual)
Check refrigerant lines if shared with AC
Test and verify safety controls
Verify cycle and temperature rise
Provide written report with current condition

Maintenance plans bundle the annual tune-up with priority scheduling and discounts on parts and labor. Call 631-591-2289 for current plan pricing.

Understanding AFUE: Furnace Efficiency Ratings

AFUE (Annual Fuel Utilization Efficiency) tells you what percentage of your fuel actually becomes heat in your home versus going up the flue. Here's how it breaks down on Long Island:

Below 80% AFUE: Older systems, often pre-2000. Replacement strongly recommended.
80-83% AFUE: Standard mid-efficiency units. New units must meet at least 80% federally.
90-95% AFUE: High-efficiency condensing furnaces. Eligible for some rebates.
96-98.5% AFUE: Top-tier condensing furnaces. Maximum savings, federal tax credit eligible.
Variable-Speed Models: Adjust airflow continuously for steadier comfort and quieter operation.
Two-Stage / Modulating: Run at low or high based on demand, lower fuel bills.

For most Long Island homes, the upgrade from a 70-80% AFUE unit to a 96-98% unit pays back in 5 to 8 years through fuel savings alone, often faster with rebates and tax credits applied.

Furnace Brands We Install & Service

We work on every major residential furnace brand. Common manufacturers we install or service across Long Island:

Carrier
Trane
Lennox
Bryant
Rheem
Ruud
Goodman
Amana
American Standard
York
Heil
Coleman
Comfortmaker
Payne
Tempstar
Maytag
Bosch
Daikin

Don't see your brand? We work on others too. Send a photo of the data plate to our office. Call 631-591-2289.

Why Long Island Chooses Us for Furnace Service

Furnace work rewards experience. The wrong size, the wrong duct configuration, or a missed combustion-analysis step can cost you for the next 20 years. Long Island homeowners pick us because:

Family-Owned in Wading River Since 2004
NATE-Certified Furnace Technicians
Real Heat-Loss Calculations on Every Install
All Major Brands & Fuel Types
NYS Clean Heat & Federal Rebate Paperwork Handled
Up-Front Pricing in Writing
Same-Day Service for Most Repairs
24/7 Emergency Dispatch

"They replaced our 22-year-old furnace with a Carrier 96% AFUE unit and added a smart thermostat. Cleaner install than the original, and we got the federal tax credit and a utility rebate. Heating bills are down meaningfully."

Sandy L. — Shoreham, NY ★★★★★

How It Works: Three Easy Steps

1
Call or Send a Photo
Tell us the symptom (no heat, cold air, age, etc.) and what you have. A photo of the furnace data plate speeds the quote.
2
Get a Same-Day Visit or Estimate
Most repair calls happen the same day. Replacement and installation estimates can be done by phone, video, or in-home.
3
The Work Gets Done
Most repairs are single-visit. Most full furnace replacements are 1 to 2 days. Heat is back on by the time we leave.

Related Long Island Services

Furnace work often pairs with other home comfort projects. Here's what customers commonly book together:

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Furnace FAQs

Common Questions About Long Island Furnace Service

How long does a furnace last on Long Island?

A well-maintained gas or propane furnace typically lasts 15 to 20 years. Oil furnaces often run 20 to 25 years with annual service. Electric furnaces average 20 to 30 years. Annual maintenance is the single biggest factor in equipment lifespan.

Should I repair or replace my furnace?

If your furnace is over 15 years old, costs are climbing every winter, you've had multiple repairs, the heat exchanger is cracked, or AFUE is below 80%, replacement usually wins long-term. A modern high-efficiency furnace can drop heating costs by 20 to 30 percent.

How often should I replace my furnace filter?

Standard 1-inch fiberglass filters should be replaced every 30 to 60 days during the heating season. High-efficiency 4-inch or 5-inch pleated filters can last 6 to 12 months. Homes with pets or allergies should change filters more often.

How often should I have my furnace tuned up?

We recommend a professional furnace tune-up once a year, in late summer or early fall before the heating season. Annual maintenance preserves efficiency, extends equipment life, prevents mid-winter breakdowns, and keeps your manufacturer warranty valid.

What does a furnace tune-up include?

Our standard furnace tune-up includes a 20-point inspection: combustion analysis, heat exchanger inspection, gas pressure test, ignition and flame sensor check, blower motor lubrication and amperage test, condensate drain inspection, thermostat calibration, electrical and safety control checks, and a written efficiency report.

Why is my furnace blowing cold air?

Common causes include a tripped flame sensor, dirty filter, failed pilot or ignitor, gas valve issues, condensate drain clog (high-efficiency units), thermostat set to FAN ON instead of AUTO, or a furnace lockout from a safety control. Most are quick fixes once diagnosed.

Do you install high-efficiency furnaces?

Yes. We install 90%+ AFUE high-efficiency furnaces from Carrier, Trane, Lennox, Bryant, Rheem, Goodman, and other major brands. Many qualify for federal tax credits and utility rebates.

What furnace brands do you install and service?

We install and service Carrier, Trane, Lennox, Bryant, Rheem, Goodman, Amana, American Standard, York, Heil, Coleman, Comfortmaker, Payne, Tempstar, Ruud, Maytag, and other major residential furnace brands.

Ready for Furnace Service on Long Island?

Same-day furnace repair, free replacement estimates, and high-efficiency installations. Family-owned in Wading River since 2004.

Call 631-591-2289 Request a Quote

Furnace Services Long Island NY