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Despite the extension, the home qualified for EnerPHit certification. Airtightness tests were essential to obtaining the certification, says Austin Todd of CoEfficient Building Science, who the team hired to perform the tests. Lack of access to certain areas, like existing wall assemblies, and not wanting to disturb the exterior brick, Todd says, posed airtightness challenges. The Aerobarrier sealing did the trick "and got us to our goal," he adds.

The couple is proud of the fact that their renovated home uses zero fossil fuels. "We are on the grid and monitoring electricity costs for a heat pump, HRV, and heat pump hot water," Johnson says. "Back-up heat, should the electricity go out, is a Stûv fireplace." Solar panels are in the works.

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Camille LeFevre

Home Feature Editor

Expert. Practical. Sustainable.

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Camille LeFevre

Camille LeFevre is an architecture and design writer based in the Twin Cities.

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