New Hampshire has 28 verified geothermal contractors and is a heating-dominated geothermal market — long, cold New England winters maximize ground-source's COP advantage. Federal §25D was terminated by the One Big Beautiful Bill Act (P.L. 119-21) on December 31, 2025, but Eversource + NH Electric Cooperative + Liberty Utilities rebates and the §48 commercial credit keep ground-source competitive.
- 28 verified contractors
- 27 cities covered
- ★ 4.9 avg rating (2,946 reviews)
- 9 WaterFurnace dealers
- 4 IGSHPA-certified
Top New Hampshire cities for geothermal contractors
Coverage spans Manchester, Nashua, Concord, Portsmouth, Durham. Browse contractors by city below.
Featured New Hampshire geothermal contractors
New Hampshire geothermal incentives in 2026
The federal §25D Residential Clean Energy Credit was terminated for new residential expenditures completed after December 31, 2025 by the One Big Beautiful Bill Act (P.L. 119-21). 2025 installations carry forward via IRS Form 5695. New Hampshire homeowners benefit from:
- Eversource + NH Electric Cooperative + Liberty Utilities — NHSaves — utility-administered energy efficiency program.
- Federal §48 commercial credit remains active through 2034 with phase-down; widely used in third-party-owned residential leases.
For state-by-state matrix see geothermal rebates by state, and use our geothermal tax credit calculator.
New Hampshire climate, ground conditions, and permits
New Hampshire climate is humid continental (Dfb). Ground temperatures at typical loop depth stay around 47–52°F. glacial drift over granite and schist bedrock. White Mountains region has shallower bedrock with deeper drilling premiums.
Closed-loop installations require a New Hampshire DES (Department of Environmental Services)-licensed well driller, a New Hampshire mechanical contractor licensing (handled at municipal level), and a local building permit covering the indoor unit and electrical service. For permit specifics see our geothermal permit lookup.
Frequently asked questions
How much does geothermal cost in New Hampshire?
A typical 3-ton residential system in New Hampshire runs $20,000 to $34,000 installed depending on loop type, soil conditions, and location. Utility rebates from Eversource + NH Electric Cooperative + Liberty Utilities reduce out-of-pocket cost. Federal §25D no longer applies to 2026 residential installations.
Do I need a permit for geothermal in New Hampshire?
Yes. Closed-loop installations require a New Hampshire DES (Department of Environmental Services)-certified well driller, a state-licensed mechanical contractor, and a local building permit covering the indoor unit and electrical service. Reputable New Hampshire contractors handle the full permit pull.
Vertical or horizontal loops in New Hampshire?
Lot size and soil determine loop type. Vertical bores dominate dense suburbs; horizontal loops are cost-competitive on rural lots with adequate land area (1,500–3,000 sq ft per ton). Pond loops work where adequate water access exists. An IGSHPA-trained designer matches loop type to your specific lot, soil, and load.