24/7 Emergency Service Available (631) 862-6016

Serving Nassau & Suffolk Counties Since 1983

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Count On Us For Sales, Service & Installation of:

  • Air Conditioning Systems
  • Ductless Air Conditioning
  • Heating Systems
  • Indoor Air Quality Products
  • Gas & Electric Water Heaters
  • Humidifiers
  • Ventilation
  • Thermostats

Quality Workmanship
at Affordable Prices!

Residential & Commercial

Residential Heating & Air Conditioning

We Service All Brands

We understand that no other single system in your home plays a larger role in your comfort or how much your utility bill will be than your heating & air conditioning system. At DML & S, our technicians our available to keep your HVAC system running efficiently year-round. Now that we're into the coldest months of the year, your heating system in Miller Place, Mount Sinai, and the surrounding NY area is more important than ever. Give us a call today if you require heating service, repair on installation.

New System Installation

Today’s high efficiency HVAC systems can deliver healthy and comfortable indoor air while keeping your utility costs low. We specialize in cost-effective solutions, including furnaces, boilers, and heat pumps.

Interested in a FREE Estimate on a New System? Call us Today!

Repair & Maintenance

If you are happy with the system you already have, we offer routine maintenance agreements that can help extend its useful life. Our skilled technicians will handle all your service needs from licensed warranty and post-warranty repairs, to immediate emergency response.

Need Service? Give us a call!