Find a licensed HVAC contractor in Smithtown, NY

Who licenses HVAC contractors in Smithtown

• Suffolk's restricted license application lists Oil Burner and HVAC categories under Restricted Plumbing, and an Oil and Gas Burner category under Restricted Electrical.
• Anyone who intends to do electrical, plumbing or duct work in Suffolk homes must also apply for the required licenses among Restricted Electrical (HVAC), Restricted Plumbing (HVAC) and Home Improvement, the county's application says.
• Suffolk's home improvement law covers heating and ventilation ductwork but leaves out work in the electrical and plumbing fields.
• Suffolk charges a non-refundable $200.00 application fee for a restricted license.

State rules and the lookup steps: how to check an HVAC contractor's license.

What the Town of Smithtown requires

• Smithtown residents can file HVAC, heating unit and air conditioning permits online, along with gas conversions.
• Central air and HVAC work needs a letter of certification from the contractor, and residential central air also needs an assessor's certificate.
• The Town's October 2020 geothermal form lists a residential fee of $100 plus $100 for the certificate of compliance, $200 in all, and points to the current fee schedule.
• Tank installation, abandonment and removal are filed on the Town's electric and plumbing application for work with no construction.
• The Town's online permit system accepts residential tank installation and removal applications.
• For a residential tank installation or removal, Smithtown's 2012 instruction sheet calls for two completely filled out, signed and notarized applications and one signed, notarized excavation affidavit.
• Smithtown's residential tank sheet also requires photocopies of the plumber's license and insurance with valid expiration dates.
• Fuel oil storage tanks are included in the heating equipment section of Smithtown's application for a permit to build or install.
• A residential generator application needs a copy of the survey showing the generator's distance to the property line and to every structure, and its location must meet accessory structure setbacks.
• For a natural gas generator, the certificate of compliance requires a pressure test.
• An assessor's certificate is required for a residential generator, under the Town's electric and plumbing permit requirements.

The Town of Smithtown Building Department handles permits ((631) 360-7520). Our Town of Smithtown permit guide covers how to apply, inspections and certificates.

Homes in Smithtown: what the Census shows

Across the Town of Smithtown, villages included, the median home was built in 1968, and 24% of homes were built before 1960. Utility gas heats 50% of occupied homes here, fuel oil 39% and electricity 7%. With fuel oil in 39% of homes, ask early what a new system means for the oil tank.

What heating and cooling work costs here

Labor is a large part of any price. Long Island heating, air conditioning and refrigeration mechanics and installers earn a median $77,707 a year, from about $56,620 at entry level to $94,796 with experience. (New York State Department of Labor, wages updated to the first quarter of 2026.) Prices come from written estimates; more in the heating and cooling cost guide.

Before you hire in Smithtown

• Ask for the license number the work needs here (see who licenses HVAC contractors above), and check it before you sign.
• Ask who files with the Town of Smithtown Building Department, and who books the inspections.
• Will you do a heat loss or load calculation before you size the new system?
• What happens to the old equipment and to any oil tank, in writing?