It is possible to achieve substantially deeper reductions of energy use in existing homesrnthan was previously assumed practical or possible. However, a comprehensive "all at once" deeprnenergy retrofit may be overwhelming for many homeowners, either in terms of complexity orrnexpense. However well-intended or cost-effective, fragmented improvements have the potentialrnto create barriers to deep reductions as a result of suboptimal levels of investment in efficiency orrnthe need to undo or redo work to achieve a higher level of performance.rnThis paper addresses the need for and challenge of steering our investments in homernimprovements and energy investment so that they lay the foundation for substantial reductions inrnthe immediate future. Staging deep retrofits pose opportunities and challenges. This paper willrnexplore bundles of measures that can be deployed in a staged manner to achieve the followingrnobjectives: 1) create, rather than block, opportunities and options for further reductions; 2)rnminimize negative unintended consequences such as indoor air quality or combustion safetyrnproblems; and 3) build the knowledge and institutional and human capacity to achieve deeperrnsavings. Bundles of measures that form a defined package have the possibility of simplifying anrnarray of options and making it easier to communicate choices to occupants and owners as well asrndesigners and contractors. This paper will examine potential strategies and implications forrnenergy efficiency initiatives. The confounding issue of uncertainty, particularly related to therncost and performance of emerging technology, will be acknowledged.
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