Field Test Evaluation of Conservation Retrofits of Low-Income, Single-Family Buildings in Wisconsin: Audit Field Test Implementation and Results Page: 13 of 84
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A control group was included in the study to allow compensation for
seasonal or occupant behavior changes in energy use between the early and late
parts of the heating season. The control group houses were analyzed as if they
had had retrofits by breaking their data into pre- and post-retrofit periods.
The control house pre-retrofit periods ended with the last reading preceding
January 29. The post-retrofit periods began after the observation that included
January 29. The treatment group results were adjusted for the apparent savings
of the control group.
The study began with the identification of suitable houses, defined as
those meeting the following suitability criteria:
o Eligible for the WAP: household income is less than 125% of poverty, and
the house has not been weatherized by DOE or utility programs in the past
o Single-family detached house (but no mobile homes).
o Owner has occupied the house for at least one year and is not planning on
extended time away from home during the test period.
o House is heated by a natural gas furnace or boiler.
o Secondary heating devices are not used (electric bathroom heaters and occa-
sional fireplace use are acceptable).
o Occupants are willing to take part in the field test.
The first criterion, eligibility, was selected to make the results relevant to
the WAP. The remaining criteria were chosen to maintain the data quality at the
highest feasible level. Houses were randomly assigned to either the audit group
or control group.
Mean measured savings were 169 therms/year, 86% of the predicted measurable
savings. The seven houses which received a new condensing furnace retrofit
saved 102% of the predicted measurable savings. The six houses which received
wall insulation saved 74% of the predicted measurable savings. The remaining
seven houses, which received only minor retrofits, had a slight increase in
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McCold, L.N. Field Test Evaluation of Conservation Retrofits of Low-Income, Single-Family Buildings in Wisconsin: Audit Field Test Implementation and Results, report, January 1, 1988; United States. (digital.library.unt.edu/ark:/67531/metadc740901/m1/13/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.