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Heating • Cooling • Air Quality
Your Year Round Comfort Starts Here

Reliable HVAC Services in Smithtown, Long Island

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Smithtown’s Family Owned HVAC Experts

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Installations
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Where Comfort Meets Craftsmanship

From rooftop commercial installs to cozy home furnace tune-ups, our NATE-certified technicians bring care, clarity, and clean work to every job. We don’t cut corners — we make comfort personal.

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Discover Smithtown's Expert
HVAC Services Today

Preventive Maintenance

  • Heating – clean burner and heat exchanger systems for efficiency and power savings (electric/gas)

Cooling PM – Evap Cleaning

  • To prevent mold and
    keep efficiency high

Condenser Coil Cleaning

  • Prevent low efficiency and allow system to last longer because it is not under
    unnecessary stress & amp draw

Troubleshooting / Emergency

  • Heating – natural gas boilers & furnaces. Replacing broken component
  • Air conditioning – all package, split and mini split systems. Component replacement & refrigerant additions

Commercial / Residential
Installations

  • On demand hot water systems (high efficiency)
  • With/without storage tank
  • Conventional hot water domestic water heaters

Commercial Sites
Services

Commercial Sites Services

  • New installations: Goodman, Daikin, Fujitsu
  • Ducted package units (Heating & Cooling)
  • Split systems
  • Mini split systems
  • Non-ducted mini splits

Service Contracts – Quarterly Schedule / Semi-Annually

  • Clean filter change, belt change
  • Amp readings on operational components
  • Refrigerant readings if needed

Adding
Accessories

Adding Accessories

  • UV Bulb for microbe elimination and cleaner air
  • Electrostatic filter systems
  •  Dehumidification systems
  • Humidifying systems – Steam (Honeywell)

Why Choose Us?

Why Smithtown Homeowners Trust Quigley & Son’s Maintenance

  • Licensed & Insured Technicians

    NATE-certified and background-checked pros

  • Rapid Response Times

    Same-day service available

  • Energy-Efficient Equipment

    Save more on your utility bills

  • Local & Family-Owned

    Real relationships, not corporate call centers

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How it Works

From Call to
Comfort in
4 Simple Steps

From Call to Comfort in
4 Simple Steps

  • Step 1: Schedule Your Appointment

    Call or book online — we'll confirm a time that fits your schedule.

  • Step 2: Free On-Site Assessment

    Our technician evaluates your needs and explains your options with transparent pricing.

  • Step 3: Professional Service

    We complete the job with precision, using top-tier equipment and clean work practices.

  • Step 4: Follow-Up & Review

    We verify everything’s running smoothly — and we’re just a call away if you need us.

Contact Us

Get a Free Estimate or Same-Day Service Today

No hidden fees. No obligations. Just honest HVAC solutions from your local experts.

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What Our Customers Are Saying

“Quigley & Son’s saved us during a heatwave — showed up same-day and fixed our system within hours. Friendly, professional, and affordable.”

— Lisa R.

Smithtown

“Transparent pricing and great service. No pressure or upsells — just solid work.”

— Jason T.

St. James

“Our go-to for both residential and our storefront HVAC. Always reliable.”

— Brenda M.

Hauppauge

Contact

Service Areas

Wherever you are in Suffolk County, we bring comfort to your doorstep — fast and efficient.

Proudly Serving Smithtown and Surrounding Long Island Communities

Cities:

  • Smithtown

  • Kings Park

  • Commack

  • Hauppauge

  • Nesconset

  • St. James

  • Ronkonkoma

  • Islip & Surrounding Areas

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