This Old, Audited House

Audits uncover energy leaks in a Philly rowhome.
by Will Dean

On a brisk December morning, a white van pulls up outside a quaint, stone-fronted, two-story duplex rowhome in Mount Airy. There are a few people inside, myself included, and some ghostbuster-esque equipment, including fans, various detectors, meters and a big fan. The only invisible thing we’re

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