The Green Impact Report Quick take: Quick take: Larry Lessard reveals why geothermal systems are 400-600% more efficient than fossil fuel alternatives and how network geothermal is revolutionizing district-level sustainability—plus the strategic insight that could reshape your approach to renewable energy priorities.
Meet Your Fellow Sustainability Champion
Larry Lessard is an applied scientist with a career encompassing hydrogeology, contaminated site remediation, and geothermal system design and installation.
He is the founder of both Lessard Environmental, Inc. and Achieve Renewable Energy, LLC. He is also a nature and astronomical photographer, third degree blackbelt in Judo, and a Hang Glider Pilot.
Breaking Ground on Better Building
In this episode, Larry revolutionizes traditional HVAC approaches:
Key Insight #1: Geothermal Efficiency Crushes All Alternatives
The Challenge: Natural gas boiler systems max out at 92% efficiency while losing energy up the flue
The Solution: Geothermal systems move heat energy instead of creating it, achieving 400-600% efficiency
ROI: Equipment lasts twice as long (protected indoors) with dramatically lower lifecycle costs and zero combustion emissions
Key Insight #2: Network Geothermal Unlocks District-Scale Impact
The Challenge: Individual building systems can’t serve properties without underground space or share thermal loads
The Solution: Connect multiple buildings to shared ground heat exchangers—cooling-dominant buildings export heat to heating-dominant ones
ROI: 100+ year lifespan for ground infrastructure creates generational sustainability investments, like “building a cathedral”
Key Insight #3: Target the Biggest Carbon Slice First
The Challenge: Many sustainability efforts focus on electricity (only 10-15% of emissions) while ignoring bigger opportunities
The Solution: Prioritize building heating/cooling (30%+ of emissions) and transportation (34%) for maximum climate impact
ROI: Attacking the largest emission sources delivers the biggest environmental returns and typically the best financial incentives
Sustainable Soundbite
Your Green Building Action Plan
Transform your next project with these steps:
This Week: Calculate your building’s heating vs. cooling loads to determine geothermal feasibility and efficiency potential
This Quarter: Explore federal tax credits (30-50% depending on location and domestic content) and local utility rebates for geothermal installations
This Year: Evaluate network geothermal opportunities across your building portfolio—identify cooling-dominant buildings that could share heat with heating-dominant ones
Connect & Learn More
- 🔗 Connect with Larry Lessard: LinkedIn
- 🌿 Learn about Achieve Renewable Energy: Achieve Renewable Energy
- 📖 Recommended reading: A Civil Action: Jonathan Harr 🎬
- 📚 New England Geothermal Professional Association: NEGPA
- 🗒️ Read the transcript: here
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