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Nassau County, New York

Heating & cooling in Nassau County, New York

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Browse 38 verified heating & cooling registered across Nassau County, New York (including Hempstead, Freeport, Valley Stream, Long Beach, Glen Cove, Mineola). Every record is compiled from New York City Department of Buildings & NYS Licensing Authorities (NYC DOB / NYS) public credential files under NYC Administrative Code Title 28 (Licensed Master Plumber, Master Electrician, and General Contractor Registration) & NYS General Business Law Article 36-A.

Official State Authority: New York City Department of Buildings & NYS Licensing Authorities (NYC DOB / NYS) Official Registry · County Seat: Mineola

Municipalities in Nassau County (3)

Select a city or town in Nassau County to view local permit guidance and registered heating & cooling records:

Elmont 4Mineola 4Valley Stream 3

38 heating & cooling records · Nassau County, NY

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Public Directory Quality: Official NYC DOB / NYS license records across Nassau County · Zero sponsored order · Never sold as a lead · How our data works →

Heating & cooling directory — Nassau County

38 matching records across 3 open municipalities · 25 on this page · Contactable records first, then alphabetical.

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Other Counties in New York

New York County (Manhattan)Kings County (Brooklyn)Queens CountyBronx CountyRichmond County (Staten Island)Westchester CountySuffolk CountyAlbany CountyErie CountyMonroe CountyOnondaga CountyRockland CountyOrange CountyDutchess County

Before the first call

  • Describe the job and ask whether it is within their scope and service area.
  • Check the credential with its issuing authority and ask what applies where the work will happen.
  • Ask about insurance, availability, who will do the work, and a written scope.
  • Ask about callout fees, labor or fixed rates, materials, cancellation and any estimate charge.
Prepare a project brief

Verification Overview & Key Takeaways: How to Check Official Credentials

HomeCrafto displays source records with different scopes, including licenses, registrations, municipal permits and community records. A source entry is not proof of qualification for your job. Before signing a work order or paying a deposit, homeowners should confirm that the contractor’s credential number is active, verify that the license classification covers the specific trade scope required for the job, and request a current Certificate of Insurance (COI) directly from the issuing insurance carrier. Independent verification protects your property and ensures compliance with local building codes.

How do you verify a contractor license number and insurance on official portals (FAQ)?

You can verify active license standing and consumer protection rules directly through official government portals, including Washington L&I Contractor Verify, the California Contractors State License Board (CSLB), the Connecticut eLicense Portal, USA.gov State Consumer Protection Offices, and FTC Home Improvement Consumer Guidance. Always confirm municipal permit requirements with your local building department before work begins.