Furnace Contractor in Nassau County, NY
Gas & Oil Furnace Repair, Installation & Replacement
Local furnace contractor serving all of Nassau County. From no-heat emergency repairs to high-efficiency 96% AFUE furnace installations — licensed, insured, and NATE-certified. Call for same-day service or a free replacement quote.
Furnaces are the workhorse heating system across most of Nassau County — especially in central Nassau's dense residential belt where natural gas is universally available. Our team repairs, replaces, and installs gas and oil furnaces from every major manufacturer, with same-day dispatch for no-heat calls and Manual J load calculations on every replacement quote so your new furnace is sized correctly instead of oversized by default.
Why Nassau County Homeowners Choose Us
Proper Sizing on Every Install
Manual J load calculation on every furnace replacement — no more oversized units that short-cycle.
Full Permit & Inspection Handling
We file the mechanical permit, coordinate the town inspection, and hand you signed-off paperwork.
Same-Day No-Heat Response
24/7 emergency dispatch with priority for elderly, infants, and medically vulnerable households.
Furnace Services We Offer in Nassau County
Full-scope furnace contractor services for Nassau County homeowners.
Furnace Repair
No-heat diagnosis, ignition failures, blower motor issues, flame sensor cleaning, gas valve replacement.
Learn more about Furnace RepairFurnace Installation
96% AFUE two-stage and variable-speed installations sized with Manual J load calculation.
Learn more about Furnace InstallationFurnace Replacement
Same-day-quote replacements when your old unit fails — financing available for approved credit.
Learn more about Furnace ReplacementFurnace Tune-Up
Annual maintenance that preserves manufacturer warranty and catches carbon-monoxide risks.
Learn more about Furnace Tune-UpOil-to-Gas Conversion
Full-scope oil-to-gas conversion — tank abandonment, gas line, furnace, and permit sign-off.
Learn more about Oil-to-Gas ConversionEmergency Heating Service
24/7 no-heat dispatch across Nassau County with priority routing during cold snaps.
Learn more about Emergency Heating ServiceFurnace in Nassau County — What We See in the Field
Nassau County's furnace inventory skews older than most Long Island homeowners realize. Central Nassau — Levittown, Hicksville, Westbury, Hempstead — is dominated by Levitt-era Capes and ranches originally built with 60% AFUE gas or oil furnaces, most of which have been replaced once but many with builder-grade 80% AFUE units that still leave 20 cents of every heating dollar going up the flue. Upgrading to a 96% AFUE two-stage condensing furnace typically pays back in 6-9 years on Nassau's gas rates, and modulating variable-speed models handle the sharp temperature swings we get between Sound-side neighborhoods and inland central Nassau. On the South Shore — Long Beach, Baldwin, Freeport, Massapequa — we still see oil-fired furnaces in older homes; oil-to-gas conversion often makes sense given National Grid's expanded gas main coverage over the past decade. Every furnace install includes proper venting analysis (Category IV condensing furnaces need PVC sidewall venting, not the existing masonry chimney), combustion air sizing, and low-load Manual J to avoid the short-cycling that plagues oversized replacements.
Upfront Pricing in Nassau County
Transparent ranges — no surprise fees. Final quote after in-home visit.
| Service | Price Range | Notes |
|---|---|---|
| Diagnostic Visit | $199 | Waived with completed repair |
| Furnace Repair (typical) | $150–$850 | |
| 80% AFUE Furnace Install | $4,800–$6,800 | |
| 96% AFUE Furnace Install | $6,500–$9,500 | Financing available |
| Oil-to-Gas Conversion | $8,500–$14,500 | Varies with tank removal + gas line |
| Annual Tune-Up | $199 |
Furnace Contractor Services Throughout Nassau County
Professional service available in your area
Don't see your area? Contact us to check availability
Frequently Asked Questions
Should I repair or replace my Nassau County furnace?
The rough rule: if repair cost exceeds 40% of replacement cost and the unit is over 12 years old, replacement usually wins. We'll walk through the math honestly during any diagnostic call — including efficiency gains, warranty coverage, and financing options.
Do I need a permit to replace a furnace in Nassau County?
Yes — every Nassau County town requires a mechanical permit for furnace replacement, and most require a final inspection. We file the permit under our license and coordinate the inspection so you don't have to.
How long does furnace installation take?
A straight furnace swap is typically 6-8 hours. Oil-to-gas conversion or venting reroutes to Category IV condensing units can add a day. We work in one visit whenever possible so your family isn't without heat overnight.
What furnace brands do you install in Nassau County?
We lead with Trane XV and XR series and Bosch condensing gas furnaces. Both offer strong 10-year parts warranties, quiet operation, and proven reliability in Nassau's climate. We can quote other brands on request.
Can you handle oil-to-gas conversion end-to-end?
Yes. We handle permit filing, National Grid coordination, tank abandonment or removal, gas line installation, furnace installation, and inspection sign-off. One contractor, one point of contact, one closeout.
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Same-day appointments available. Upfront pricing, no pressure, and every install backed by our labor warranty.