Field Test Evaluation of Conservation Retrofits of Low-Income, Single-Family Buildings in Wisconsin: Audit Field Test Implementation and Results Page: 62 of 84
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6. CONCLUSIONS AND RECOMMENDATIONS
The results of the field test point to conclusions and recommendations
about the field test method, the audit's accuracy, the performance of some
major retrofits, and the cost effectiveness of the ADRP as a component of the
Overall, the mean measured savings were 83% of the mean predicted savings,
but the statistical uncertainty associated with the measured savings is quite
large (see Sect. 4.1.2). On average, measured savings of condensing furnaces
were very close to predictions. Houses which received wall insulation achieved
mean measured savings only of 74% as large as predicted; a statistically signi-
ficant difference. The seven houses which had no major retrofits had mean con-
sumption which was slightly larger after retrofit than before; the mean measured
savings were significantly smaller than predicted.
While the audit appears to be reasonably accurate for major retrofits from
a program perspective, the audit is not very accurate from the individual house
perspective. Of the 20 audit group houses, ten had measured savings which were
significantly higher or lower than predicted. Three of the seven houses which
received condensing furnaces had significant discrepancies between predicted and
measured savings. Four of the six houses which received wall insulation had
measured savings which were significantly different than predicted. These
discrepancies are most likely the result of the audit's failure to account for
one or more factors which affect energy savings. The causes of these discrepan-
cies should be investigated and the audit savings algorithms adjusted accor-
Condensing furnaces and wall insulation appear to be cost-effective retro-
fits, while one or more minor retrofits appear not to be cost effective. The
most likely ineffective retrofits are vent dampers and infiltration-reduction
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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/m1/62/: accessed January 18, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.