Pennsylvania greenhouse stays warm by storing heat underground

RELATED DISTINCT: Short Yale Climate Connections radio/podcast spot on Tim Clymer’s Threefold Farm climate-battery greenhouse in Pennsylvania storing heat in underground tubes/soil instead of propane. Apple Podcasts exact title: Pennsylvania greenhouse stays warm by storing heat underground; show Climate Connections; released 2026-05-15. Apple description: A climate battery system helps plants thrive all winter with no fossil fuels needed. Companion yaleclimateconnections.org article (same date/title) opened: Tim Clymer, Threefold Farm, PA, built climate battery greenhouse instead of propane-heated houses. Article: fans blow warm daytime air into underground tubes heating soil; reverse draw at night; soil as thermal battery.

Evidence tier: podcast. RELATED DISTINCT climate-battery greenhouse (subsurface heat storage), not a dug walipini pit.

podcast|candidate