Abstract
The Modular Retrofit Experiment (MRE) was a collaboration between five gas utilities and Princeton designed to provide well documented measurements of energy savings associated with house retrofits. Two retrofit strategies were evaluated — a one-day visit by “house doctors”, using instrumented energy analysis, and the same house-doctor treatment followed by additional, major retrofits. The 138 houses in this experiment included a group of control houses that received no treatment. All three groups showed significant energy savings, measured using the Princeton Scorekeeping Method (PRISM). Median percent savings (± standard errors) for the control, house-doctor, and major-retrofit houses were 9.8 (±1.4), 15.3 (±1.9), and 21.9 (±1.2), respectively. The savings in the control group closely agree with the average gas savings in the utility service areas over the same period of time. Our analysis indicates that the full potential of the one-day house-doctor visit was not realized in the MRE. Nevertheless, estimates of costs and savings reveal that house doctoring was more cost-effective than the more conventional measures installed in the subsequent contractor retrofits.
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