Business Details
43 Years
experience
Emergency
services
Trusted HVAC Services in Saint James, NY
Established in 1983, DML & S Air Conditioning & Heating is a family-owned and operated HVAC contractor serving Nassau and Suffolk counties on Long Island. Our team of EPA-certified technicians specializes in residential and commercial heating, cooling, and indoor air quality solutions, with over three decades of experience delivering quality workmanship at affordable prices. We pride ourselves on using top brand-name products and maintaining professional affiliations with industry leaders like ACCA and RSES.Our commitment to customer satisfaction is demonstrated through 24/7 emergency service, comprehensive maintenance contracts, and factory-trained expertise in systems like Mitsubishi Electric and York. With multiple licensing credentials including Home Improvement License #50244-H, we combine technical proficiency with personalized service to build lasting relationships with our clients across East Setauket, Miller Place, Mount Sinai, and surrounding communities.
Services
Residential HVAC
Commercial HVAC
Maintenance Contracts
Indoor Air Quality
Ductless Systems
Emergency Repairs
Thermostat Installation
Water Heater Services
Ventilation Solutions
Humidifier Installation
Details
- Year established: 1983
Highlights and features
- Family-owned business with 40+ years of combined HVAC experience
- Factory-trained technicians for premium brands like Mitsubishi and York
- 24/7 emergency service with rapid response times
- Comprehensive maintenance contracts with priority service
- Licensed and insured with multiple industry certifications
Associations and certifications
- Air Conditioning Contractors Of America (ACCA)
- Refrigeration Service Engineers Society (RSES)
- Mitsubishi Electric Diamond Contractor
- York Liberties Dealer
- PSEGLI Cool Homes Contractor
Services
Residential HVAC
We provide comprehensive residential heating and cooling solutions including system installation, repair, and maintenance. Our EPA-certified technicians service all brands and offer 24/7 emergency response for urgent HVAC needs. With specialized expertise in high-efficiency furnaces, heat pumps, and ductless systems, we help homeowners in Nassau and Suffolk counties maintain optimal indoor comfort while reducing energy costs through modern, sustainable technology.
Commercial HVAC
Our commercial HVAC services focus on system design, installation, and preventive maintenance for business properties. We implement energy-efficient solutions that reduce operating costs while maintaining occupant comfort. Our team handles complete system replacements, partial upgrades, and emergency repairs for commercial buildings, with specialized knowledge in sustainable climate control systems tailored to Long Island's climate conditions and business requirements.
Maintenance Contracts
We offer comprehensive maintenance contracts that include bi-annual system inspections, filter replacements, and performance optimizations. These agreements extend equipment lifespan, improve energy efficiency, and include priority service scheduling. Our contracts provide 15% discounts on parts and labor, with added benefits like extended warranties and 30-day labor guarantees, helping both residential and commercial clients prevent unexpected HVAC failures.
Indoor Air Quality
Our indoor air quality services address pollution control through advanced filtration systems, UV purification, and humidity management. We install and service dehumidifiers, air scrubbers, and carbon monoxide detection systems to create healthier living and working environments. With specialized testing procedures and remediation techniques, we help clients in Saint James and surrounding areas identify and eliminate airborne contaminants that affect health and comfort.
Ductless Systems
We specialize in Mitsubishi Electric ductless mini-split systems that provide zoned temperature control for homes and businesses. These energy-efficient solutions offer quiet operation and precise climate control through multiple indoor units connected to a single outdoor compressor. Our certified technicians handle complete system design, installation, and maintenance, helping clients achieve customized comfort solutions without traditional ductwork requirements.
Questions
What HVAC services do you offer?
We provide residential and commercial HVAC installation, repair, maintenance, indoor air quality solutions, ductless systems, and 24/7 emergency service across Long Island.
Are you available for emergency HVAC repairs?
Yes, we offer 24/7 emergency service with technicians available to respond to urgent heating and cooling issues at any time.
Do you offer maintenance agreements?
Yes, our maintenance contracts include bi-annual inspections, filter replacements, priority service, and 15% discounts on parts and labor to prevent system failures.
What areas do you serve?
We serve Nassau and Suffolk counties including Saint James, East Setauket, Miller Place, Mount Sinai, and surrounding Long Island communities.
Do you offer financing options?
Yes, we provide flexible financing options for new system installations and major HVAC upgrades to qualified customers.
What certifications do your technicians hold?
Our team includes EPA-certified technicians with factory training from Mitsubishi Electric and York, plus affiliations with ACCA and RSES.
