The Glenmont HVAC design required contractors to bury geothermal wells in a pit 300 yards from the house. The NPS-owned property used is adjacent to but not part of the original Glenmont estate. Of course, trenches across the Glenmont property connect the wells to the mansion.

Geothermal heating and cooling offered designers the most efficient way to provide Glenmont with a controlled interior climate that could help stem the deterioration of valuable artifacts inside the Edison home.

The need to leave the Glenmont structure and grounds as undisturbed as possible challenged both planners and contractors.

This portion of the Edison National Historic Site renovation and restoration project is complete.

Workers had to drill holes below grade to route piping from the geothermal field into the Glenmont basement

The new HVAC system required the relining of a Glenmont chimney.

Contractors carefully lifted individual air handling units through a well-protected opening into the Glenmont attic. Later, they joined the units together and connected them to equipment in the basement.

To minimize disturbances to the historic portions of Glenmont, contractors often had to perform ticklish tasks like drilling and soldering in very cramped spaces.