HVAC Contractor Permit Requirements in Nashua, NH

Complete permit and license guide for starting a hvac contractor in Nashua, Hillsborough County, New Hampshire.

Updated 2026-03-15 6 stops $400–$1,500 est. 4–10 weeks
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Not legal advice. Requirements may change — always verify with your local government authority before applying. This guide was compiled from public and official sources (last updated ) and has not yet been independently source-verified — confirm each requirement before acting on it.

Federal — start here

1 stop

  1. EIN (Employer Identification Number)

    Required if you have employees or operate as an LLC or corporation. Free from the IRS.

    Official government source

    FreeImmediate (online application)

State of New Hampshire

2 stops

  1. New Hampshire — No Sales Tax

    New Hampshire has no state sales tax and no local sales taxes. Businesses do not need a sales tax permit. However, businesses may be subject to the Business Profits Tax (BPT) and Business Enterprise Tax (BET). Register with the NH Department of Revenue Administration.

    Official government source

    Free (business tax registration)Immediate (online)

  2. EPA Section 608 Certification (for refrigerants)

    Technicians who purchase, recover, or handle refrigerants must hold EPA Section 608 certification. Required by federal law regardless of state.

    Official government source

    $20–$100 (exam)1–2 days

City of Nashua / Hillsborough County

3 stops

  1. New Hampshire HVAC Technician Licensing — HVAC Contractor

    HVAC contractors in New Hampshire must hold applicable trade licenses. EPA Section 608 certification is required for refrigerant handling. Local permits are required for each installation.

    Official government source

    $100–$200 (initial)4–8 weeks

  2. City of Nashua City Clerk — Business License

    Nashua requires a Business License for regulated business types. Contact the City Clerk for requirements applicable to your business category. This license must be renewed annually and displayed at your place of business.

    $50–$500/year depending on business type and gross revenues1–3 weeks

  3. Hillsborough County / Nashua Mechanical Permit (per project)

    A mechanical permit must be obtained from the local building department for each HVAC installation or major repair. Inspections are required upon completion.

    Official government source

    $50–$300 per project1–5 business days

Terminus

Open for business — est. $400–$1,500 · 4–10 weeks

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Official Sources

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