Trusted Heating & Cooling Experts right from Medford
When Long Island homeowners need dependable heating and cooling, they turn to Central Air Systems. Since 1989, we have been the name families across Suffolk County trust for honest work, expert installations, and responsive service that treats every home like our own.
Get Your Personalized Quote in Minutes
Tell us a little about your home and what you need — in just a few simple steps, you'll get a personalized quote. No pressure, no hassle, just honest pricing from a team Long Island has trusted for 37 years.
Not Sure Where to Start? Contact Us!
Comprehensive Heating and Cooling Solutions for Medford, NY Homeowners
We've been perfecting our craft right here on Long Island since 1989. From the salt air along the South Shore to the wooded neighborhoods of central Suffolk County, we understand what it takes to keep your home comfortable through every season. Our team of NATE Certified technicians is factory-trained on the industry's most advanced equipment from Lennox, Bosch, Mitsubishi, and Climate Master, which means we do not just install systems — we engineer comfort solutions tailored to the unique demands of your home.
What sets us apart is pretty straightforward. We show up when we say we will. We explain your options in plain English. We stand behind our work long after the installation is complete. That is the kind of service that turned a small operation in Medford, NY into one of Long Island's most respected HVAC contractors, and it is the same approach we bring to every single job.
We're the
Ductless Experts
Ductless mini-split systems provide efficient heating and cooling without the need for ductwork. Perfect for room additions, older homes, or zone control, these systems offer quiet operation and significant energy savings while maintaining individual comfort in each space. As Mitsubishi Electric Diamond Dealers, we bring factory-trained expertise to every ductless installation across Medford, NY and the surrounding communities.
Expert HVAC Services Backed by
Industry-Leading Brands
From emergency repairs to complete system replacements, Central Air Systems delivers the full spectrum of heating, cooling, and indoor air quality services that Long Island homeowners depend on. Every service we offer is backed by our 37 years of field experience and our partnerships with the industry's most trusted manufacturers.
Air Conditioning Services
Keep your home cool all summer with expert Lennox air conditioning services. From high-efficiency system installations with advanced SEER2 ratings to same day emergency repairs and comprehensive seasonal tune-ups, our NATE Certified technicians deliver reliable cooling solutions across Suffolk County.
We specialize in Lennox high-efficiency air conditioning systems, providing expert installation, fast repairs, and thorough maintenance that keeps your home comfortable and your energy bills in check. Our commitment to honest service means we will always explain your options clearly and provide good-better-best recommendations that match your budget.
Heat Pump Services
Year-round comfort from a single, high-efficiency system. As Bosch Platinum Pros, our team brings specialized expertise in ducted heat pump technology that provides powerful heating in winter and efficient cooling in summer — all while dramatically reducing your energy consumption.
Heat pumps can qualify for significant federal and state tax credits and utility rebates. We install and service Bosch and Lennox ducted heat pump systems with advanced inverter technology and smart defrost controls. Explore our heat pump installation, repair, and maintenance services.
Mini-Split Services
Long Island's ductless specialists. As Mitsubishi Electric Diamond Dealers, we design and install ultra-quiet, hyper-efficient mini-split systems perfect for homes without ductwork, room additions, converted spaces, and zone-control applications.
We do a lot of ductless work across Long Island, and our Diamond Dealer certification means we have met Mitsubishi Electric's highest standards for training, installation quality, and customer satisfaction. Learn more about mini-split installation, repair, and maintenance.
Furnace Services
Long Island winters demand a furnace you can count on. We install, repair, and maintain high-efficiency gas furnaces from Lennox and Bosch that deliver powerful, consistent warmth while keeping your energy costs under control.
Our technicians understand the nuances of furnace sizing for Long Island's coastal climate and will ensure your system is properly matched to your home's heating requirements. A well-maintained furnace is a safe furnace. Explore our furnace installation, repair, and maintenance services.
Geothermal Services
Harness the stable temperature of the earth for up to 70% less energy than conventional systems. As authorized Climate Master dealers, we bring specialized expertise in geothermal design, installation, and service that most HVAC contractors simply cannot match.
Geothermal systems can qualify for significant federal tax credits, making them an increasingly popular choice for Long Island homeowners. We handle everything from loop field engineering to indoor equipment placement. Learn about geothermal installation, repair, and maintenance.
Indoor Air Quality Solutions
Breathe easier with comprehensive indoor air quality solutions from Lennox Healthy Climate, Air Scrubber, and Aprilaire. We specialize in dehumidifiers, steam humidifiers, UV lights, and whole-home air purification systems designed to work with your existing HVAC system.
Long Island's coastal humidity makes proper moisture control essential for comfort and preventing mold growth. We do a lot of dehumidifier and steam humidifier work across the region. Learn more about our indoor air quality services.
HVAC Installation Price Ranges
Transparent starting price ranges for the most common installations we perform across Long Island. Switch tabs to view ductless, central AC, heat pump, furnace, air handler, and indoor air quality pricing.
Ductless Mini-Split
Single-zone to whole-home multi-zone systems
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1-Zone System
Single indoor head — perfect for an addition, finished attic, or one room
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2-Zone System
Two indoor heads from one outdoor unit
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3-Zone System
Three indoor heads — common for upper-floor bedrooms or multi-room conversions
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4-Zone System
Four indoor heads from a single condenser
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5-Zone System
Five indoor heads — whole-home ductless coverage
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Pricing shown is a general starting range for typical Long Island installations. Final pricing depends on equipment selection, ductwork condition, electrical work, permits, and removal of the old system. Contact us for a free, no-obligation quote tailored to your home.
Central AC Replacement
Whole-home central air conditioning by tonnage
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2-Ton AC
Cools approximately 1,000–1,300 sq ft
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2.5-Ton AC
Cools approximately 1,300–1,600 sq ft
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3-Ton AC
Cools approximately 1,600–1,900 sq ft
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3.5-Ton AC
Cools approximately 1,900–2,200 sq ft
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4-Ton AC
Cools approximately 2,200–2,600 sq ft
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5-Ton AC
Cools approximately 2,600–3,200 sq ft
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Pricing shown is a general starting range for typical Long Island installations. Final pricing depends on equipment selection, ductwork condition, electrical work, permits, and removal of the old system. Contact us for a free, no-obligation quote tailored to your home.
Heat Pump Replacement
Ducted heat pump systems — heating and cooling in one
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2-Ton Heat Pump
Approximately 1,000–1,300 sq ft of conditioned space
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2.5-Ton Heat Pump
Approximately 1,300–1,600 sq ft of conditioned space
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3-Ton Heat Pump
Approximately 1,600–1,900 sq ft of conditioned space
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3.5-Ton Heat Pump
Approximately 1,900–2,200 sq ft of conditioned space
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4-Ton Heat Pump
Approximately 2,200–2,600 sq ft of conditioned space
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5-Ton Heat Pump
Approximately 2,600–3,200 sq ft of conditioned space
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Pricing shown is a general starting range for typical Long Island installations. Final pricing depends on equipment selection, ductwork condition, electrical work, permits, and removal of the old system. Contact us for a free, no-obligation quote tailored to your home.
Gas Furnace Replacement
High-efficiency gas furnaces by heating capacity
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45,000 BTU Furnace
Smaller homes and condos — approximately 1,000–1,400 sq ft
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70,000 BTU Furnace
Average-size Long Island homes — 1,400–2,000 sq ft
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90,000 BTU Furnace
Larger homes or homes with higher heat loss — 2,000–2,600 sq ft
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110,000 BTU Furnace
Large or older, less-insulated homes — 2,600+ sq ft
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Pricing shown is a general starting range for typical Long Island installations. Final pricing depends on equipment selection, ductwork condition, electrical work, permits, and removal of the old system. Contact us for a free, no-obligation quote tailored to your home.
Air Handler Replacement
Indoor blower / coil cabinets paired with AC or heat pump
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2-Ton Air Handler
Pairs with a 2-ton AC or heat pump
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2.5-Ton Air Handler
Pairs with a 2.5-ton AC or heat pump
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3-Ton Air Handler
Pairs with a 3-ton AC or heat pump
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3.5-Ton Air Handler
Pairs with a 3.5-ton AC or heat pump
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4-Ton Air Handler
Pairs with a 4-ton AC or heat pump
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5-Ton Air Handler
Pairs with a 5-ton AC or heat pump
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Pricing shown is a general starting range for typical Long Island installations. Final pricing depends on equipment selection, ductwork condition, electrical work, permits, and removal of the old system. Contact us for a free, no-obligation quote tailored to your home.
Air Purification Options
Whole-home indoor air quality upgrades
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Germicidal UV Light System
In-duct UV-C light treats coil and air stream
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Air Scrubber
Active air purification with photocatalytic oxidation
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Whole-Home Air Filtration
High-MERV media filter cabinet, installed at the air handler
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Whole-Home Steam Humidifier
Adds controlled humidity through the existing duct system
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Whole-Home Dehumidifier
Pulls excess humidity out of the entire house — ideal for Long Island
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Pricing shown is a general starting range for typical Long Island installations. Final pricing depends on equipment selection, ductwork condition, electrical work, permits, and removal of the old system. Contact us for a free, no-obligation quote tailored to your home.
The Central Air
Systems Story
Since 1989, Central Air Systems has been more than just an HVAC contractor — we have been a part of the fabric of the Long Island community. What started as a commitment to do right by our neighbors in Medford, NY has grown into one of Suffolk County's most respected heating and cooling companies, and we have never lost sight of the values that got us here.
We are not a franchise. We are not owned by a private equity group. We are a local team of dedicated professionals who wake up every morning thinking about how to deliver better comfort, better efficiency, and better service to the families and businesses we are proud to call our neighbors. Every technician on our crew is NATE Certified, and every installation is performed to the highest standards in the industry — because our reputation is built one job at a time.
Our partnerships with Lennox, Bosch, Mitsubishi Electric, and Climate Master are not just dealer badges. They represent our commitment to offering Long Island homeowners the most advanced, most reliable, and most efficient HVAC equipment available. When manufacturers like Lennox recognize us as their first Premier Dealer on Long Island, it says something about the standard we hold ourselves to.
So, What Sets Us Apart?
Local Expertise Since 1989
We know Long Island's climate, building codes, and utility programs inside and out because we have been working here for decades.
Premier Partnerships
We hold the highest certifications Lennox Premier Dealer, Mitsubishi Diamond Dealer, and Bosch Platinum Pros.
Transparent, Honest Pricing
We always provide upfront quotes with no hidden fees, no surprise charges, and no pressure. We don't believe in surprises.
NATE Certified & Licensed Team
Every technician holds the industry's most respected certification, ensuring your system is installed and serviced correctly.
Community Commitment
We are active members of LIPA, BPI, ACCA, and PSEG Home Comfort Pros because we believe in supporting our community.
Energy Efficiency Focus
As an Energy Star certified dealer and mini-split specialists, we help you choose high-performance systems to lower your utility bills.
Make Comfort Affordable with Flexible Financing
We believe every homeowner in Medford, NY and across Long Island deserves access to reliable, high-performance heating and cooling — regardless of budget. That is why we have partnered with Service Finance to offer financing options that make upgrading your HVAC system affordable and stress-free.
What are the Benefits of Financing?
Choose from a variety of payment terms that fit comfortably within your monthly budget
Get pre-approved in minutes with a simple application through Service Finance
Do not settle for an inefficient system when you can upgrade now and pay over time
Our financing partner offers competitive rates to qualified homeowners
Our plans offer transparent terms with no hidden fees or unexpected charges
A new high-efficiency system can lower your monthly utility bills, offsetting payments
We will walk you through every available financing option to find the perfect fit for your budget. There is never any pressure — just honest guidance from a team that wants to help you make the smartest decision for your home.
Protect Your Investment with Our Comfort Club Maintenance Program
Regular professional maintenance is the single best thing you can do to protect your HVAC investment and avoid unexpected breakdowns. Our Comfort Club membership gives you peace of mind knowing your system is always in expert hands — tuned, tested, and ready to perform when you need it most.
Members Enjoy the Following Benefits
Members jump to the front of the line for all service calls, even during peak season
Two comprehensive maintenance visits per year to prepare your system for summer and winter
Exclusive member discounts on any repair services needed throughout the year
Routine care can add years to your system's lifespan, delaying costly replacements
A well-maintained system runs more efficiently, saving you money every month
Documented professional maintenance keeps your manufacturer's warranty valid and intact
For 37 years, Central Air Systems has been the HVAC partner that Long Island families trust for heating, cooling, and indoor air quality services across Suffolk County and beyond. From our home base in Medford, NY, our fleet of fully-stocked service vehicles reaches communities throughout the region, delivering the same expert care and honest service that has defined our company since 1989.
Whether you need a routine maintenance visit, an emergency repair in the middle of a heat wave, or a complete system replacement designed for maximum efficiency, our team is ready to serve your home with the professionalism and expertise that decades in this business has taught us.
Frequently Asked Questions
We are proud to be a Lennox Premier Dealer, Mitsubishi Electric Diamond Dealer, Bosch Platinum Pro, and authorized Climate Master geothermal dealer. Our NATE Certified technicians are factory-trained on these brands and can also service and repair most other major HVAC manufacturers. With 37 years of experience, we bring specialized expertise to every brand we touch.
As a general rule, if your AC is more than 12-15 years old and needs a repair that costs more than half the price of a new system, replacement is usually the smarter investment. Our technicians will always give you an honest assessment — we will never push a replacement when a repair will do, and we will never patch a system that is past its useful life. We will lay out your options and let you decide.
Yes, we provide emergency heating and cooling repair service throughout Suffolk County. When your system fails on the hottest day of summer or the coldest night of winter, our technicians respond quickly to restore your comfort. Contact us for immediate assistance.
Our Comfort Club membership includes two seasonal tune-ups per year, priority scheduling on all service calls, and exclusive discounts on repairs. Regular professional maintenance prevents unexpected breakdowns, extends your system's lifespan, improves energy efficiency, and keeps your manufacturer's warranty valid. Most members find the plan pays for itself through avoided repairs and lower energy bills.
Through our partnership with Service Finance, qualified homeowners can finance a new HVAC system installation with 0% interest spread over 60 monthly payments. The application process is quick and straightforward, and our team will walk you through every step. Visit our contact page to get started with a financing application.
Ductless mini-splits are ideal for homes without existing ductwork, room additions, converted spaces, and zone-control applications. As Mitsubishi Electric Diamond Dealers, we specialize in these systems and can design multi-zone configurations that let you control temperatures room by room. They are extremely energy-efficient, whisper-quiet, and can both heat and cool your home.
We recommend professional maintenance at least twice a year — once in spring to prepare your cooling system for summer, and once in fall to prepare your heating system for winter. Our Comfort Club membership automates this schedule so you never have to worry about remembering. Consistent maintenance prevents breakdowns and can extend your system's life by several years.
Absolutely. Geothermal systems work exceptionally well on Long Island. As authorized Climate Master dealers, we have designed and installed geothermal systems throughout Suffolk County that provide year-round comfort using up to 70% less energy than conventional systems. They can also qualify for significant federal tax credits, making them increasingly affordable.
We typically recommend a multi-layered approach: a high-quality air filtration system to capture particles, Lennox Healthy Climate UV lights to neutralize biological contaminants, and an Aprilaire dehumidifier or humidifier to manage moisture levels. Long Island's coastal humidity makes dehumidification especially important — we do a lot of dehumidifier and steam humidifier installations to help homeowners control moisture and prevent mold.
Most residential installations are completed in one to two days depending on the complexity of the project. A straightforward AC or furnace replacement is often a single-day job, while more involved projects like geothermal installations or whole-home ductless systems may take several days. We will provide a clear timeline during your consultation so you know exactly what to expect.
Yes, we offer maintenance plans for commercial properties across Long Island. Whether you manage a small office, a retail space, or a larger commercial building, our team can develop a maintenance program tailored to your equipment and budget. Contact us to discuss your commercial HVAC needs.
We hold an extensive list of industry certifications and memberships: NATE Certified, BBB Accredited, Energy Star partner, ACCA member, LIPA member, BPI member, and PSEG Home Comfort Pros. We are also a Lennox Premier Dealer (Long Island's first), Mitsubishi Electric Diamond Dealer, and Bosch Platinum Pro. These certifications represent our ongoing commitment to the highest standards in the industry.
Yes, most heating and cooling installations in Suffolk County require a building permit. Our team handles the entire permitting process for you — from filing the paperwork to scheduling the required inspections. It is one less thing for you to worry about, and it ensures your installation is fully code-compliant from start to finish.
We're based in Medford, NY and serve homeowners throughout Suffolk County — from Smithtown and Hauppauge to the Hamptons, including Southampton, Sag Harbor, Bridgehampton, and everywhere in between. Whether you're a few miles from our shop or out on the East End, our team provides the same responsive, expert service. View our full service area for a complete list of towns we cover.
You can use our online Smart Quote Form to answer a few quick questions about your home and comfort needs — it only takes a couple of minutes. You can also call us at 631-254-4900 to speak with someone directly. Either way, we will put together a personalized recommendation and transparent pricing with no pressure and no hidden fees.
Long Island’s Trusted Comfort Professionals Since 1989
After decades of serving Medford, NY and communities across Suffolk County, Central Air Systems has earned a reputation that speaks for itself. We are not just another HVAC company — we are your neighbors, your partners in home comfort, and the team that will be here for you for decades to come.
Whether you need a new Lennox air conditioning system, a Mitsubishi ductless mini-split for your bonus room, a Bosch heat pump that heats and cools with one system, a Climate Master geothermal installation, or simply a thorough tune-up to keep your current equipment running its best, we bring the same dedication to every job.
Decades of proven expertise right here on Long Island
NATE Certified technicians trained by top manufacturers
Premier dealer status with Lennox, Mitsubishi Electric, Bosch & more
0% financing for 60 months through Service Finance
Honest, transparent pricing with no hidden fees or surprise charges
We offer 24/7 Emergency service when you need us most
Our Work Across Long Island