Cascade Apartments: Deep Energy Multifamily Retrofit

Stacey Rothgeb, A. Gordon, R. Kunkle, L. Howard, M. Lubliner, E. Martin, Stacey Rothgeb (NREL Technical Monitor)

Research output: NRELSubcontract Report


In December of 2009-10, King County Housing Authority (KCHA) implemented energy retrofit improvements in the Cascade multifamily community, located in Kent, Washington (marine climate.) This research effort involved significant coordination from stakeholders KCHA, WA State Department of Commerce, utility Puget Sound Energy, and Cascade tenants. This report focuses on the following three primary BA research questions: 1. What are the modeled energy savings using DOE low income weatherization approved TREAT software? 2. How did the modeled energy savings compare with measured energy savings from aggregate utility billing analysis? 3. What is the Savings to Investment Ratio (SIR) of the retrofit package after considering utility window incentives and KCHA capitol improvement funding.
Original languageAmerican English
Number of pages45
StatePublished - 2014

Bibliographical note

Work performed by Washington State University Energy Program for BA-PIRC, Cocoa, Florida

NREL Publication Number

  • NREL/SR-5500-61011

Other Report Number

  • DOE/GO-102014-4343


  • Building America
  • deep energy enclosure retrofits (DER)
  • energy audits
  • marine climate
  • multifamily
  • residential
  • residential buildings
  • retrofit package
  • savings to investment ratio
  • treat analysis
  • utility billing analysis
  • ventilation system


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