New England's Trusted Geothermal & Borefield Drillers
Professional Geothermal Drilling Since 1997
A division of T.J. Ogden Co. — Over 44 years of specialized borehole technology experience. Licensed drillers, IGSHPA accredited, and certified in HDPE Electrofusion for residential, commercial, and institutional projects throughout New England.
Maximize 2026 Clean Heat Incentives: Mass Save Up to $25,000 + 30% Federal Tax Credit
Switching to ground-source geothermal has never been more affordable. Take advantage of $15,000–$25,000 Mass Save whole-home rebates, 0% interest HEAT Loans, and uncapped 30% Federal Clean Energy Tax Credits (Section 25D).
Engineering Capabilities
Specialized Solutions for Every Sector
Whether retrofitting a historic New England home or engineering a multi-borehole university campus array, GDNE delivers turn-key ground heat exchange infrastructure.
Homeowners & Custom Residential
Complete replacement of volatile heating oil and propane with quiet, zero-emission ground-source comfort. Compact drilling rigs designed for minimal landscape impact.
- ✓ Up to $25,000 Mass Save rebates
- ✓ Uncapped 30% Federal Clean Energy Tax Credit
- ✓ 0% interest HEAT Loans up to $25,000
Commercial, Campus & Municipal
Large-scale borefield engineering for university campuses, hospitals, and municipal buildings. Proven performance at Harvard University and Nichols College.
- ✓ Standing column wells up to 1,500 ft
- ✓ Boston BERDO 2.0 & Stretch Code compliance
- ✓ Section 48 Investment Tax Credits (ITC)
HVAC & Engineering Contractors
We serve as your dedicated ground loop contractor. We handle test borings, IGSHPA-certified HDPE electrofusion, and thermally enhanced bentonite grouting.
- ✓ 48-hour in-situ thermal conductivity (TC) testing
- ✓ Subsurface geological formation logging
- ✓ Certified loop headering & manifold tie-ins
Why Geothermal?
The Smart Choice for New England Homes & Businesses
Ground-source heat pumps represent the pinnacle of energy efficiency, delivering unmatched comfort while liberating buildings from volatile heating fuel costs.
Up to 70% Energy Savings
Ground-source heat pumps reduce heating and cooling operational energy by up to 70% vs. heating oil and propane. Performance tailored by building envelope and loop sizing.
Zero On-Site Combustion
Eliminate oil, propane, and gas burning. Pristine indoor air quality and zero direct greenhouse gas emissions.
Engineered for Sub-Zero Winters
Draws heat from constant 50°F–55°F New England bedrock, maintaining 100% heating capacity during sub-zero polar vortexes.
50+ Year Ground Loop Lifespan
High-density polyethylene (HDPE) ground loops carry a 50+ year service life, dramatically outlasting conventional HVAC systems.
Commercial & Institutional Drilling
Engineered Borefields & Standing Column Wells
We partner with mechanical engineers, architects, general contractors, and university facilities teams to design, drill, and commission high-capacity borefields for institutional decarbonization and Boston BERDO 2.0 / MA Stretch Energy Code compliance.
Standing Column Wells (SCW)
Deep bedrock open-loop boreholes that maximize heat transfer density in tight urban or campus footprints. Features optional bleed flow design to sustain high thermal loads.
Closed-Loop Vertical Fields
Multi-borehole arrays with IGSHPA-certified HDPE 4710 U-tubes, thermally enhanced bentonite grout, and electrofusion header trenching to the building mechanical room.
Thermal Conductivity (TC) Testing
On-site pilot test boreholes and formation thermal conductivity testing to provide mechanical engineers with precise subsurface heat transfer data for loop optimization.
Our Process
From Subsurface Assessment to Commissioning
Our streamlined five-step process ensures your geothermal borefield is drilled cleanly, safely, and to the strictest IGSHPA standards.
Site & Geological Assessment
Analyze New England bedrock geology, utility setbacks, and building heating/cooling tonnage requirements
Custom Borefield Design
Engineer optimal borehole count, depth, spacing, and header manifold piping layout
Rotary Drilling & Loop Insertion
Licensed drilling crews advance boreholes and install pre-tested continuous HDPE loops
Thermally Enhanced Grouting
Pressure-grout boreholes from bottom to top to ensure environmental protection and maximum heat transfer
Fusion Manifold & Hydrostatic Testing
Electrofusion weld headers, trench to mechanical room, and perform pressure decay testing
Proven Track Record
Trusted by Prestigious New England Institutions
From historic university campuses to complex healthcare facilities and luxury residences, GDNE delivers proven borehole reliability.
Harvard University
Standing column borehole drilling for university facilities and campus sustainability.
Nichols College
Deep vertical geothermal field serving student dormitory heating and cooling.
Regional Medical Center
High-capacity closed-loop borefield providing year-round climate resilience.
Got Questions?
Geothermal Drilling FAQs
Everything you need to know about geothermal boreholes, Mass Save incentives, and performance.
Regional Coverage
Licensed Geothermal Drillers Across New England
Headquartered in Tewksbury, MA, serving residential and commercial projects throughout Massachusetts, New Hampshire, Connecticut, Rhode Island, Maine, Vermont, and New York.
📍 Massachusetts
Mass Save incentives up to $25k, Boston BERDO compliance, Greater Boston & Worcester
📍 New Hampshire
NHSaves rebates, Southern NH granite bedrock, lakes & mountain regions
📍 Connecticut
Energize CT $15k rebates, 0.99% financing, sales & property tax exemptions
📍 Rhode Island
Clean Heat RI incentives, coastal geology, residential & institutional
📍 Maine
Efficiency Maine rebates, coastal & inland granite bedrock boreholes
📍 Vermont
Efficiency Vermont incentives, cold-climate high COP geothermal systems
Ready to Switch to Clean Geothermal Heating & Cooling?
Get a free, no-obligation site assessment and estimate from New England's premier geothermal drilling contractors.