Our Project

Deep Energy Retrofit of an old Maine Home

Office 1Every idea should have a “real world” example.  Ours is a 70 year-old home on Office Drive in Bath, Maine, USA.  Lovingly referred to as “The Office”, this house was built in the early 1940s as a duplex with two 600 sq/ft one bedroom apartments.  During the retrofit process it was converted to a 1200 sq/ft single family home with 2 bedrooms, 2 full baths, kitchen/living area, and a family room or 3rd bedroom.  From basement to attic, the entire envelope has been renovated to increase R-values and reduce infiltration using a combination of techniques and materials that lend themselves to retrofitting.

Come Visit:  This is a demonstration project and we like to show the home and answer questions.  We welcome visitors at several planned “Open Houses.”   Next one will be late spring of 2011.  If you cannot attend an open house give us a call and we’ll make it happen

AL Office Video1

Deep Energy Retrofit Guidelines for “The Office”

Goal:      Reduce whole house energy use by 75% on a modest budget.


  • Insulation:  Walls R-30, Attic R-80, Basement R-20
  • Efficient Lighting
  • Energy Star Appliances
  • Infiltration < 0.1 ACH (air change/hour)
  • Air-to-air heat exchanger
  • Improved Hot Water Heater
  • Sealed Combustion for furnace and wood stove

Modest Budget?  The goal is to invest wisely in this home for cost-effective efficiency so as not to exceed its real estate value.  The surrounding neighborhood average home value is $80-150,000 and the real estate value “fixed up nicely” (i.e., cute not efficient) is guesstimated to be $120-130,000.  Will someone be willing to pay more for the investments in high efficiency when this home is sold?  Time will tell.


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