Century-Old NY Church Goes Geothermal, Cuts Emissions

For over a century, Christ Church Bronxville served its community through blazing summers without air conditioning and winters heated by fossil fuels. That changed six months ago when the church completed a geothermal system that now keeps hundreds of parishioners comfortable while slashing emissions.

The church faced a choice: replace aging boilers and add basic air conditioning, or invest in something transformative. Reverend Kurt Gerhard and church leaders chose the bold path, launching a $1 million capital campaign called "The Next 100."

The new system works through a network of pipes drilled hundreds of feet into the parking lot, tapping into the Earth's constant underground temperature. In winter, water circulates through these pipes, absorbs warmth from the ground, and returns to heat pumps that warm the church and its attached buildings. Summer reverses the process, storing excess heat underground for later use.

The change was desperately needed. "Our church was only available in the morning, and it was 85 degrees in there because of the heat outside," Gerhard said. The attached child care center suffered too, with hallways too hot for children despite window units in individual rooms.

Installing geothermal in dense urban areas comes with challenges. Engineers must navigate strict safety regulations and avoid underground infrastructure like subway tunnels and water mains. Even in less dense neighborhoods, they often drill through unstable artificial fill used during construction.

Yet the financial case keeps improving. New York utilities now offer incentives for property owners making the switch, and federal tax rebates remain available for commercial and multi-family buildings. Since 2019, state laws have pushed the transition forward, including Local Law 97, which imposes escalating limits and penalties on building emissions through 2040.

The investment pays off over time. The boreholes last at least 50 years, according to Zachary Fink of ZBF Geothermal, the company leading the church project. Buildings account for more than two-thirds of New York City's greenhouse gas emissions, making these conversions critical for climate goals.

The Ripple Effect

What started as one church's practical solution could reshape how New York buildings approach heating and cooling. The project demonstrates that even century-old structures in challenging urban environments can transition away from fossil fuels successfully.

For Gerhard, the environmental benefits align perfectly with the church's values. He views improving the environment as part of the church's "calling," showing how faith communities can lead on climate action.

The system runs entirely on electricity, meaning when paired with renewable energy sources, buildings can approach zero emissions. Other property owners across New York are watching closely, seeing proof that geothermal works in real-world conditions with real congregations depending on it daily.

One church's hundred-year legacy now points toward a cleaner future for thousands of buildings to come.