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Deep Energy Retrofit of 70 year old home reducing total energy load by 75%, HERS rating 63, Energy Star 2

What You Need to Know


Heat Recovery Ventilation Deep energy retrofit of 70 year-old home. Focus on super-insulation, super-tight construction, and minimizing heating and electrical load. Goals: Reduce total energy load by 75%. Improving indoor air quality. Basement: Old was wet, leaky, smelly. Now dry, bright, and clean. Totally sealed with moisture barrier, then spray foam to R-20. Walls: Combining dense pak cellulose and foam walls to R-30. Ceiling: Cellulose to R-80. Infiltration: Reduced by factor of 5, from 4000 to 800 CFM@50P. Indoor air quality: Air-to-air heat exchanger. Dedicated outside air for sealed combustion of wood stove and oil furnace.

Other Benefits:

Improved indoor air quality

Efficiency or Sustainability Improvements:

Deep energy retrofit, Heat recovery ventilation, Recycled Materials, Super Insulated Walls/ Roof, Thousand Home Challenge candidate


Get an energy audit first and find a trusted energy consultant to help prioritize.

Open House Info:

To Bath via Rt. 1, north on Washington St., left on Oliver, left at Y, First house on left. Follow signs.

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