We just approved the 20th Thousand Home Challenge project! Congratulations to Ruth von Goeler and Kelly Slough of Northampton, MA. They participated in National Grid’s Deep Energy Retrofit pilot in 2012. Their OPTION B threshold was 13,071 kWh (OPTION B inputs - fossil fuel heat, 4 in household, 3,208 FFA, and 6,208 HDD (base 65). Andrew Webster of Coldham & Hartman Architects was the project manager.
Their annual energy for the post retrofit monitoring period was 8,136 kWh. Their 110-year-old home was previously insulated and had a relatively efficient heating system. As part of the retrofit they substantially increased the finished floor area and still achieved a 61% reduction in energy use from their baseline.
Attached is a spreadsheet with data from our twenty completed projects.
Interesting numbers, ranges, means, and comparisons! I welcome your observations. What is most interesting from the attached spreadsheet? Please provide suggestions for charts and graphs to tell the story of the 1000 Home Challenge projects to date.
6.9 kBtu/ Ft2: Avg Energy Use Index (EUI); US National avg. 44.8 kBtu/ Ft2 (single family homes)
1.91 kWh/ Ft2: Avg. THC Whole House Energy Use; US National Avg.: 14.27 Ft2
(5) Net Zero or Better
(3) Also charge Electric Vehicles
1,709 kWh/year: Average Energy Use per Occupant
4,554 kWh Average project energy use; 31,389 US National Avg: 31,389 kWh/yr
8,108 kWh Average project Thousand Home Challenge threshold
USE OF PV
(17) Homes have PV; (8 of 20) Projects met the Thousand Home Challenge without PV
(93 kW) Total installed PV Capacity (17 homes)
HOUSE & HOUSEHOLD CHARACTERISTICS
1869 Oldest home; 2008 Newest home
Year Built: (20%) 1850-1899; (25%) 1900-1930; (15%) 1931-1960; (30%) 1961-2000; (10%) 2001-2010
Correlation between indicators of energy performance and age: None
576 Ft2 Smallest home; 3,208 Ft2 Biggest single family home
2,271 Ft2 Average house size (per household)
1.73 Occupants: Average household size
(18) Single-family homes; (2) Duplexes