Our Story
Nearly 20 Years of
Geothermal Excellence
in NH & VT
Since 2007, AGB Geothermal has been helping New Hampshire and Vermont homeowners cut energy costs, reduce their environmental footprint, and stay comfortable year-round — with geothermal systems built to last a lifetime.
Who We Are
Built on a Belief That
Better Energy Is Possible
AGB Geothermal was founded in 2007 with a simple mission: give NH & VT homeowners access to the most efficient, reliable, and environmentally responsible heating and cooling technology available.
We are a family and veteran owned business. What started as a small operation has grown to incorporate our whole family — from customer service and sales to installation and service. Our kids have taken on roles to help grow and sustain what we've built together, and that family commitment shows in every job we take on.
Our owner and operator, Peter Duguay, is an Honorably Discharged Combat Veteran of the U.S. Army. To every job he brings with him the Army's Seven Core Values: Loyalty, Duty, Respect, Personal Courage, Selfless Service, Honor — and most importantly, Integrity.
We're not a national chain. We're your neighbors — and that means we're invested in the long-term health and comfort of the homes and communities we serve.
Our History
Nearly Two Decades of Growth
AGB Geothermal founded in New Hampshire
Expanded service territory into Vermont
Became a certified WaterFurnace dealer
Introduced the Well-Connect Hybrid System
Surpassed 500+ geothermal installations across NH & VT
Credentials & Memberships
Certified. Qualified. Trusted.
We hold industry-leading certifications that ensure every installation meets the highest standards of quality, efficiency, and safety.
WaterFurnace GeoPro Master Dealer
WaterFurnace International
Highest dealer certification level awarded by WaterFurnace
IGSHPA Member
International Ground Source Heat Pump Association
Member #17867-0708
BPI Certified Building Analyst Professional
Building Performance Institute
BPI #5032735
EPA Certified
Environmental Protection Agency
#P42A4FE58CFC532F1
ACCA Quality Assured (QA) Recognized
Authorized to install Geothermal for Energy Star Qualified Homes
Efficiency Vermont — Efficiency Excellence Network Member
AGB Geothermal is a proud member of Efficiency Vermont's Efficiency Excellence Network, recognizing our commitment to delivering high-performance, energy-efficient installations across the state.
What We Stand For
Our Values
Environmental Stewardship
We believe clean energy starts at home. Every geothermal system we install reduces fossil fuel dependence and lowers carbon emissions for decades to come.
Family & Veteran Owned
AGB Geothermal is family and veteran owned. Our whole family is involved — from customer service and sales to installation and service — and Peter's Army values guide everything we do.
Uncompromising Quality
We only install systems we'd put in our own homes. That means top-tier equipment, meticulous installation, and standing behind our work long after the job is done.
Honest Guidance
Geothermal isn't right for every home. We'll tell you the truth — and if it's a good fit, we'll make sure you understand exactly what you're getting and why.
Local Expertise
NH & VT winters are no joke. We know the climate, the soil, the well depths, and the homes in this region — and we design every system accordingly.
Long-Term Partnership
Our relationship doesn't end at installation. We offer maintenance plans, service calls, and ongoing support to keep your system running at peak efficiency.
Where We Work
Proudly Serving
New Hampshire & Vermont
From the Lakes Region to the Upper Valley, from the White Mountains to the Connecticut River Valley — if you're a homeowner in NH or VT, we're your geothermal team.
- Southern & Central New Hampshire
- Lakes Region, NH
- White Mountains region, NH
- Upper Valley (NH & VT border)
- Central & Southern Vermont
- Connecticut River Valley
Ready to Make the Switch
to Geothermal?
Let's talk about your home, your heating system, and whether geothermal is the right move for you. Our consultations are free, honest, and pressure-free.