New Construction HVAC in Medford, Southampton, Port Jefferson, Long Island, Suffolk Country NY and Surrounding Areas

You may have seen our trucks or even some of our crews installing HVAC systems in some of the surrounding homes and businesses. We are a family owned and operated company providing all types of services in the area for over 60 years !  In fact Danisi Energy is the preferred HVAC contractor for a variety of:

  • Custom home builders
  • Residential general contractors,
  • Light commercial contractors, &
  • Property Managers


Danisi Energy’s team has knowledge and expertise to deliver on any  project requirements. Our team is available to manage your project from design, installation and post construction customer support/service.

Danisi Energy offers:

  • 24 hour / 7 day a week service, with response within 2 hours.
  • Ability to to meet most projects scheduling requirements
  • Competitive pricing
  • The industries most recognizable brand names that are synonymous with the best in quality, value, efficiency and respect including:  Lennox, Ruud, Water Furnace, Carrier, Trane, Mitsubishi Electric and more!
  • Mechanical Engineering design – Manual J, load calculation for every job to ensure that the heating and air-conditioning is sized right for your project
  • Technicians that are EPA and NATE certified and factory trained to service all brands of equipment
  • Upgrade and performance based options.
  • We Specialize in multistage and multi zone ultra-high efficient systems with variable volume
  • Certified by PSEG utility rebate programs as well as Energy Star programs that have earned up to $30,000 in rebates or higher!
  • Provide you with indoor air testing, fuel oil deliveries, service gas, geothermal and electric heat pumps
  • Provide 2-year labor warranties on everything we install

HVAC Danisi Energy Southampton NY New construction

FACT: The average home being built today or renovated is getting BOTH central air conditioning or heating. Consumers are  demanding more efficient systems with popular options such as; air purification, humidification, zoning and 2 speed technology with SEER ratings over 16!


We perform work on New, Existing, and Remodeled structures such as: 

  • Custom homes
  • Production homes
  • Remodel & addition projects
  • Multifamily
  • Light commercial

For a free consultation, estimate or mechanical design, please call (631) 732-6666 ,
East End: 631-283-0400 or email us at [email protected]