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TCAAP Energy Integration Resiliency Framework Energy Efficiency Strategies 64 conservation, and edible landscapes. All of the single family homes sold out quickly and all home buyers opted to install solar PV systems. Low Load Housing Development | Townsend, Massachusetts A premiere example of low-load homes being built at scale is the 35 single-family houses on Coppersmith Way in Townsend, MA. These homes, each 1,700 square feet, were built to meet a strict efficiency standard with an additional cost of approximately $8.40 per square foot (incorporating a $4,550 Massachusetts rebate).11 The resulting thermal load was served by two efficient “mini-split” systems – one on each floor – and homes continue to be reported by residents as a comfortable and responsive living environment. Carbon Zero Residential Development | Issaquah, Washington At a built cost of about $375,000 each, the 10 townhome development outside of Seattle (started in 2008) sold out completely within the first year with homebuyers showing a willingness to pay $20 to $40 more per square foot than less efficient homes of similar size and location.12 The neighborhood, similar to what is being proposed at TCAAP, successfully utilized a community-based ground source system in combination with in-home heat pumps. The shared walls between townhomes contributed to reduced heating loads that made it financially viable. The builder/developer attests that the visible elements of the net zero energy homes, such as the in-floor radiant heating, heat pump technology, roof-top solar, and triple pane windows were key to the value that homebuyers saw. The developer (Ichijo U.S.A.) continuous to build low-load homes and sees ROI that makes sense in the market. Ground Source Heat Pump Housing Development | Kennewick, Washington SouthCliffe is a 400+ lot residential development in southeastern Washington that is comprised of low- load homes serviced by a ground source water loop and heat pumps, very similar to what is being proposed at TCAAP. Heating and hot water needs of each home are both serviced by this combination of technologies. The ground source water loop added approximately 5% to the cost of each lot, but led to immediate monthly energy cost savings. Milo Bauder and Grant Young were the developers of this project, and have worked with ThermLink in Duluth: a pioneer in ground source installations and equipment.13 11 Homes achieved a HERS score of 40. The exterior walls were built to R-46, the basement walls were R-20, the attic was insulated to R- 63 and the under basement slab was insulated with 2 inches of rigid foam with an R-value of 10. 12 Conversation with Nick Neid, project manager with Ichijo USA, the developer and builder (February 2015) 13 http://www.distinctiveprop.com/files/files/soiuthcliffepressrelease.pdf