Benchmarking and Improving Energy Performance

Executive Summary:
Researchers devoted considerable effort developing the thesis that energy performance is a key measure of quality for modular housing. Energy performance affects homebuyers, impacting their health, safety, home durability, comfort, and energy costs. To increase the visibility of energy performance within the modular industry, the team developed and initiated an industry-wide energy benchmarking effort. Baseline energy performance for selected modular manufacturers was measured and compared with competitors within and outside the modular industry. Findings were summarized in a report for each participating manufacturer, documenting the performance of each home tested and outlining a cost-effective approach to upgrade

Blower door testing.

the home to Energy Star levels of performance. Homes were tested for envelope and duct air-tightness and inspected to identify specific opportunities for improvement. The average building envelope leakage was 7.5 ACH50, significantly better than the average for all new home construction in the continental U.S. - about 11 ACH50. The average duct leakage was .12 Qn, twice that allowed by the new California energy code, .06 Qn. The resulting average energy rating was HERS 81.5. Energy analyses indicated that most

Air tightness of modular homes from blower door tests.

homes could reach Energy Star levels (HERS 86) by tightening the envelope and ducts and by adding a programmable thermostat. Other homes required more extensive improvement, including additional duct insulation and more efficient heating/cooling systems.

Technical Reports & Papers:
Proprietary

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