The Alderhurst
A 1920s stone manor retrofitted with a closed-loop geothermal system feeding radiant floor heating throughout three floors and a restored carriage house.
The existing mechanical room, carved into the foundation in 1962, had to be reimagined entirely. We installed two 5-ton geothermal units in a custom-fabricated enclosure that reduced acoustic transmission by 94% compared to the original equipment.
Radiant tubing was threaded beneath restored wide-plank oak floors using a low-profile suspension system that required no subfloor removal. Floor-to-floor temperature variance is held within 0.8°F across all twelve zones.
The library presented a particular challenge: original limestone flooring over a crawl space with insufficient clearance for standard radiant installations. A custom thin-slab overlay system was engineered to deliver full radiant output within a 22mm profile.
The carriage house — now a guest apartment — is served by a dedicated loop from the main geothermal plant, reducing the overall equipment count while maintaining independent zone control from the primary residence.