How to Use This HVAC Systems Resource
The HVAC Systems resource at newhampshirehvacauthority.com covers heating, cooling, ventilation, and related mechanical systems as they apply to residential, commercial, and industrial buildings across New Hampshire and, where noted, nationally. Content spans licensing frameworks, equipment classifications, energy codes, permit requirements, contractor qualification standards, and regional climate considerations. The structure reflects how the HVAC service sector is actually organized — by system type, regulatory jurisdiction, and professional category — rather than by a consumer decision path.
How information is organized
Content across this resource is grouped into four primary domains: regulatory and licensing frameworks, equipment and system types, regional climate and geography, and financial and program resources.
Regulatory and licensing frameworks cover the agencies, codes, and statutes that govern HVAC work in New Hampshire. This includes the New Hampshire Office of Professional Licensure and Certification (OPLC), which administers mechanical contractor licensing, and the International Mechanical Code (IMC) as adopted and amended by the state. Pages in this domain address permit processes, inspection workflows, and energy code compliance under NH HVAC Energy Codes and Standards. Licensing structures — journeyman, master, and contractor classifications — are documented at NH HVAC Licensing Requirements.
Equipment and system types form the largest section of this resource. Entries are classified by heat source (gas, oil, propane, electric, geothermal, wood pellet), distribution method (forced air, hydronic, radiant, ductless), and application (residential new construction, retrofit, commercial). Classification boundaries follow ASHRAE 90.1 and ACCA Manual J conventions where applicable. Comparative entries such as Oil vs. Gas HVAC Systems in NH sit within this domain.
Regional climate and geography pages address how New Hampshire's climate zones — which span IECC Climate Zones 5 and 6 depending on elevation and county — affect equipment selection, sizing calculations, and performance expectations. Subregional entries cover the White Mountains Region, the Seacoast, and the Lakes Region.
Financial and program resources document utility rebate programs, state energy office initiatives, and financing mechanisms. These entries reference named programs administered by Eversource Energy and Liberty Utilities, as well as the New Hampshire Office of Energy and Planning (OEP).
Limitations and scope
This resource is a structured reference for the HVAC service sector in New Hampshire. It does not provide engineering calculations, design specifications, or system selection advice for individual properties. Content describing sizing methodology — such as pages covering HVAC System Sizing in New Hampshire — presents the frameworks professionals use, not substitutes for licensed engineering judgment.
Rebate figures, incentive amounts, and program eligibility criteria change with utility rate cases and legislative appropriations. Dollar figures cited in program pages reflect publicly available program documentation at the time of writing and carry no guarantee of current accuracy. Readers verifying rebate eligibility should consult the administering utility or agency directly.
Geographic scope is primarily New Hampshire. Where system types, refrigerant regulations under EPA Section 608, or federal energy standards apply nationally, those broader frames are noted explicitly. Content marked as New Hampshire-specific — such as NH HVAC Permits and Inspections — should not be generalized to other state jurisdictions, which maintain independent licensing and code adoption frameworks.
This resource does not maintain a contractor rating or endorsement system. The HVAC Systems Listings section provides directory-format entries for contractors and suppliers operating in New Hampshire. Inclusion in those listings is not a quality certification.
How to find specific topics
The following structure describes how content is indexed and cross-referenced:
- By system type — Equipment-specific pages are accessible from HVAC System Types Comparison NH, which maps the full classification tree from central ducted systems to ductless, hydronic, and geothermal configurations.
- By regulatory topic — Licensing, permitting, and code pages are grouped under the regulatory domain and link to each other where jurisdictional overlap exists (e.g., energy code compliance and permit inspection checkpoints).
- By geography — Subregional pages address microclimatic conditions affecting equipment performance. The New Hampshire Climate and HVAC Requirements page serves as the entry point for climate-zone-specific content.
- By project phase — New construction, retrofit, replacement, and emergency service categories each have dedicated entry pages. HVAC Systems for New Hampshire New Construction and HVAC Retrofit for Existing Homes serve as phase-specific hubs.
- By financial program — Utility and state program pages are accessible from NH HVAC Rebates and Incentives, which indexes both electric utility programs and OEP-administered initiatives.
For an overview of this resource's organizational rationale, see HVAC Systems Directory Purpose and Scope.
How content is verified
Content on this resource is developed against named primary sources: New Hampshire RSA Title XXX (occupational licensing statutes), the International Mechanical Code as adopted by the state, ASHRAE standards (including ASHRAE 62.2 for ventilation and ASHRAE 90.1 for energy efficiency), and ACCA technical manuals. EPA regulatory content on refrigerant handling cites 40 CFR Part 82 directly. ASHRAE 90.1 references on this site reflect the 2022 edition, which took effect January 1, 2022, superseding the 2019 edition. ASHRAE 62.2 references on this site reflect the 2022 edition, which took effect January 1, 2022, superseding the 2019 edition.
Regulatory pages are reviewed against the New Hampshire Office of Professional Licensure and Certification's publicly posted licensing requirements and the New Hampshire Building Code Review Board's adopted amendment records. Energy program pages reference program documentation published by Eversource Energy, Liberty Utilities, and the New Hampshire Office of Energy and Planning.
No proprietary or paywalled data sources are used as the sole basis for factual claims. Where industry cost estimates or system lifespan figures appear — such as in HVAC System Lifespan in NH Climate — the source framework (e.g., ACCA, AHRI, or DOE) is identified in-line. Claims that cannot be attributed to a named public source are either omitted or presented as structural observations without quantification.