HVAC contractors in
Merrimack, New Hampshire.
A public directory of hvac contractor businesses serving greater Merrimack. Market data, licensing requirements, and cost benchmarks — updated continuously from public sources.
HVAC jobs in Merrimack
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Common Job Costs
Licensing Requirements
Licensing Requirements
NH requires Master HVAC license (RSA 329:1 and Env-Wq 2000) and a journeyman license as prerequisite. Master requires 12 years documented experience, journeyman requires 4 years apprenticeship plus 4 years experience (or 8 years total). Both require passing the appropriate EPA Section 608 certification exam for refrigerant handling and the state licensing exam. Licenses renew every 2 years with 24 continuing education hours required for renewal.
Permit Requirements
Merrimack Building Department requires permits for HVAC installations and replacements. Residential systems need a single permit application ($75-150 fee). Commercial systems require additional mechanical plan review. Ductwork modifications in conditioned spaces typically require permits. All installations must pass final inspection before system commissioning.
Inspection Schedule
Initial inspection before permit issuance; rough-in inspection during installation; final inspection upon completion before sign-off. Commercial projects may require additional inspections at 50% completion. Merrimack requires final inspection certificate before homeowner accepts system.
Insurance Minimums
NH requires minimum $300,000 general liability insurance for HVAC contractors. Recommended minimum is $1,000,000/$2,000,000 for commercial work. Workers' Compensation required if you have any employees. Many municipalities and large commercial clients mandate $2,000,000 general liability coverage.
Local market snapshot
Source: DoorBase, aggregated public ZIP-level data. Updated 8/17/2026.
How to Get Licensed
Step 1: Complete Required Experience
Accumulate either 12 years of documented HVAC work experience, or complete a 4-year apprenticeship program registered with NH Department of Education and then work 4 additional years in the field (8 years total). All experience must be documented with employer names, dates, and specific work performed. Keep detailed records and references from each employer.
Step 2: Obtain EPA Section 608 Certification
Pass the EPA Section 608 refrigerant handling certification exam. You can take this exam through an approved testing center (many vocational schools and trade organizations administer it). The exam covers Type I (small appliances), Type II (high-pressure), Type III (low-pressure), and Universal certifications. Universal is the most common for HVAC contractors. Cost is typically $50-150 per exam.
Step 3: Apply for Master HVAC License
Submit an application to the NH Department of Safety, Division of Licensing and Regulation (HVAC Board). Include proof of experience (employment letters, tax returns, apprenticeship certificates), your EPA Section 608 Universal certification card, completed application forms, and the application fee (typically $150-250). Allow 4-6 weeks for processing.
Step 4: Pass the NH Master HVAC Licensing Exam
Schedule and take the state Master HVAC licensing exam administered by a proctor approved by the NH licensing board. The exam covers code knowledge, installation practices, safety, refrigerant handling, and business practices. Passing score is typically 70% or higher. You can retake the exam if you fail, but reapplication fees apply. Study materials and practice exams are available through HVAC trade organizations.
Step 5: Receive License and Register with Local Building Department
Upon passing the exam, the state issues your Master HVAC license (valid for 2 years). Register with Merrimack Building Department and any other municipalities where you plan to work. Some communities require additional local registration or certification. Keep your license copy posted at your place of business. Begin scheduling your first continuing education hours for renewal compliance.
About This Market
Merrimack sits in southern NH with roughly 720 licensed HVAC establishments across the state, and Merrimack captures a fair share of residential and light commercial work. Demand is steady year-round but spikes hard in summer (cooling season) and winter (heating emergencies). Most jobs are furnace and AC replacements in older homes built 1970s-2000s, plus heat pump retrofits gaining traction. Installation costs run $3,500-$10,000 depending on system type, with furnace swaps on the lower end and full heat pump systems on the high end. Labor shortages keep experienced techs busy, so response times stretch during peak season. Competition is moderate—enough shops to keep prices honest, but demand usually outpaces supply, especially in emergency calls.
To work this market, you need your Master HVAC license from the state (not just journeyman). That means 12 years documented experience minimum before you can even test, or the 4+4 apprenticeship route. EPA Section 608 certification is non-negotiable for any refrigerant work—required by federal law. Get it done early. Merrimack Building Department is tight on permits: you're not installing anything without a permit and final inspection sign-off. Carry $1M general liability minimum, ideally $2M if you want the commercial contracts. Peak season is June-August and November-February—stock parts, schedule crews, and manage callbacks before the rush hits. Keep your continuing education current (24 hours every 2 years); it's easy to let that slip. Ductwork modifications, system replacements, and new construction all need permits and inspections. Work clean, follow code, and respect the inspection process. Merrimack's building department doesn't play games, and neither should you.
- Median hourly wage for HVAC technicians in NHU.S. Bureau of Labor Statistics (BLS) - Occupational Employment and Wages (OES)
- Number of licensed HVAC establishments in NHU.S. Census Bureau - County Business Patterns (CBP) and NH Department of Safety licensing records
- State licensing requirements (experience, exams, renewal)New Hampshire Department of Safety, Division of Licensing and Regulation (HVAC Board Rules Env-Wq 2000)
- EPA Section 608 refrigerant certification requirementsU.S. Environmental Protection Agency (EPA) - 40 CFR Part 82, Subpart F
- Merrimack permit requirements and building code complianceMerrimack, NH Building Department and International Energy Conservation Code (IECC) / International Mechanical Code (IMC)
- Insurance minimums for HVAC contractors in NHNH Department of Safety and Merrimack municipal building/licensing requirements
Frequently Asked Questions
What is the minimum experience required to get a Master HVAC license in NH?
NH requires 12 years of documented HVAC experience to qualify for a Master license, or completion of a 4-year apprenticeship plus 4 years of work experience (8 years total). You must also pass the EPA Section 608 refrigerant certification exam and the state's Master HVAC licensing exam. Source: New Hampshire Department of Safety, Division of Licensing and Regulation (HVAC Board Rules Env-Wq 2000).
Does Merrimack require a permit for furnace or AC replacement?
Yes. Merrimack Building Department requires a permit for any HVAC installation, replacement, or modification. The permit application fee is typically $75-150. You must obtain the permit before work begins and schedule a final inspection before the system is put into service. Contact Merrimack Building Department directly for current fees and specific requirements.
What is the average hourly rate for HVAC work in Merrimack, NH?
The median hourly wage for HVAC technicians in New Hampshire is $34.37/hour ($71,490 annually as of the latest BLS data). Actual rates charged to customers range from $85-150/hour depending on experience, complexity, and emergency status. Service call minimums and travel time often apply. Source: U.S. Bureau of Labor Statistics.
How often must HVAC contractors renew their license in NH?
NH HVAC licenses renew every 2 years. Renewal requires completion of 24 continuing education hours. You must apply for renewal before your license expiration date. Failure to renew on time can result in license suspension and fines. Check with the NH Department of Safety licensing board for the current renewal schedule and approved CE course providers.
What insurance coverage do I need to work as an HVAC contractor in Merrimack?
NH requires a minimum of $300,000 general liability insurance for HVAC contractors. However, most municipalities and commercial clients expect $1,000,000 minimum, with $2,000,000 preferred for larger projects. Workers' Compensation insurance is mandatory if you have any employees. Verify current requirements with the NH Department of Safety and with your local building department before bidding jobs.
HVAC contractors in Merrimack
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