Gas Furnace Installation for Long Island Winters
High-efficiency gas furnaces that keep your home warm through the harshest Long Island winters. NATE-certified installers. Carrier and Lennox authorized. 10-year heat exchanger warranty on all installations.
Dependable Furnace Installation for Nassau & Suffolk County Homes
Long Island winters demand a reliable heating system. When outside temperatures drop into the teens and wind chills push below zero, your furnace is the only thing standing between your family and a dangerously cold home. At Island Comfort HVAC, we take furnace installation seriously because we understand what is at stake.
Since 2009, we have installed gas furnaces in more than 1,800 Nassau and Suffolk County homes. Every installation begins with a heat loss calculation that accounts for your home’s square footage, insulation value, window quality, air infiltration rate, and the temperature differential between the coldest expected outdoor temperature and your desired indoor temperature. This calculation tells us exactly how many BTUs of heating capacity your home needs.
We install furnaces from Carrier, Lennox, Trane, and Rheem. For most Long Island homes, we recommend a high-efficiency condensing gas furnace with an AFUE rating of 96% or higher. A 96% AFUE furnace converts 96 cents of every dollar spent on natural gas into usable heat. Compare that to an older 80% AFUE furnace, and you are saving 16 cents per heating dollar. Over a typical Long Island heating season, that translates to $300 to $600 in annual gas savings.
The Carrier Infinity 59MN7 modulating furnace is our premium recommendation. It adjusts its firing rate in 0.5% increments to match your home’s exact heating load at any given moment. This means consistent temperatures throughout the house, no hot and cold spots, and the quietest operation available. For budget-conscious homeowners, the Carrier Performance 59TP6 two-stage furnace delivers excellent comfort and efficiency at a lower price point.
Furnace installation on Long Island requires careful attention to venting. High-efficiency condensing furnaces use PVC venting rather than a traditional metal chimney flue. This means we can vent through a sidewall, which is often simpler and less expensive than running a new flue through the roof. We handle all venting design, gas line connections, electrical hookups, thermostat installation, and system commissioning.
Every furnace installation from Island Comfort includes removal and disposal of the old unit, a new air filter, a carbon monoxide test after startup, and registration of your manufacturer warranty. We stand behind our work with a 1-year labor warranty in addition to the manufacturer’s 10-year heat exchanger and 5-year parts warranty.
Gas Furnace Installation Features
Heat Loss Calculation
We calculate your home’s exact heating requirements before recommending a furnace size. Proper sizing prevents short-cycling and cold spots.
96%+ AFUE Efficiency
We install high-efficiency condensing furnaces that convert 96% or more of natural gas into heat, saving you hundreds annually.
10-Year Heat Exchanger Warranty
Every new furnace comes with a 10-year heat exchanger warranty and 5-year parts warranty from the manufacturer.
PVC Sidewall Venting
High-efficiency condensing furnaces vent through PVC, often allowing sidewall venting that simplifies installation.
Carbon Monoxide Testing
We test for carbon monoxide at startup and verify safe combustion before completing any furnace installation.
Old Unit Removal
We remove and properly dispose of your old furnace at no extra charge. Includes disconnection of gas and electrical.
Our Furnace Installation Process
Free In-Home Assessment
We visit your home to inspect the existing furnace, ductwork, and venting. We perform a heat loss calculation and discuss your heating needs.
Written Quote with Options
You receive a written quote the same day with 2 to 3 furnace options at different efficiency levels and price points.
Scheduled Installation
Our crew arrives on the scheduled date, removes the old furnace, and installs the new unit including venting, gas connections, and electrical.
Startup & Safety Testing
We fire up the new furnace, check gas pressure, verify ignition sequence, test safety controls, and perform a carbon monoxide test.
Walkthrough & Registration
We walk you through the thermostat, filter location, and maintenance schedule. Warranty registration is completed before we leave.
Same crew, start to finish.
No subcontractors. The team that starts your project is the team that finishes it.
Furnace Installation Pricing on Long Island
Gas furnace installation on Long Island costs between $4,200 and $9,800. The price depends on furnace capacity (BTU), efficiency rating (AFUE), features (single-stage, two-stage, or modulating), and the complexity of the installation including venting requirements.
A basic single-stage furnace replacement with 80% AFUE and standard venting typically costs $4,200 to $5,500. A two-stage 96% AFUE condensing furnace with PVC venting runs $5,500 to $7,500. A premium modulating furnace like the Carrier Infinity 59MN7 with variable-speed blower and smart thermostat ranges from $7,500 to $9,800.
Oil-to-gas conversions require additional work including gas line installation and chimney liner removal, which typically adds $1,500 to $3,000 to the total project cost. We can coordinate with your gas utility for meter installation.
What Long Island Homeowners Say
“James came out the same day we called. Diagnosed the issue in 20 minutes, had our AC back running within the hour. His crew installed our whole system four years ago and it has been flawless. Cannot recommend enough.”
“We got four quotes for central air. Island Comfort was the only company that showed up on time, explained every option without pressure, and gave us a written quote the same visit. System runs perfectly. Fair price.”
“Our furnace died on the coldest night in January. James had a tech at our house by 9 PM and we had heat back by midnight. They did not gouge us on the emergency call either. Ended up replacing the whole furnace the following week. Professional start to finish.”
Common Furnace Installation Questions
How long does a furnace installation take?
Should I replace my furnace and AC at the same time?
What AFUE rating should I choose for Long Island?
Can you convert my oil furnace to gas?
Do new furnaces qualify for PSEG rebates?
Other Services You May Need
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