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Overview of Indoor Air Quality and Energy Efficiency Studies: Status and Findings

This report summarizes the status of various data collection efforts focused on indoor air quality, energy efficiency in weatherization programs, and occupant health. The completed surveys include findings on carbon monoxide, radon, and formaldehyde levels in homes, along with occupants' temperature preferences and health reports. Ongoing assessments evaluate energy savings persistence and the impact of energy-efficient measures installed in multi-family buildings. Future publications are anticipated to provide deeper insights into energy savings estimates and program effectiveness.

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Overview of Indoor Air Quality and Energy Efficiency Studies: Status and Findings

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  1. Status of the Data Collection • Completed • State and Agency Surveys • Indoor Air Quality Study • Bulk Fuels Study • Large Multi-family Buildings Study • In Progress • Utility Bill Collection • National Occupant Survey • National Weatherization Staff Survey • Weatherization Training Center Survey

  2. Status of the ARRA Evaluation • Evaluation Plan is complete. • One more round of surveys and utility data collection, focus on PY10 • Targeted evaluations of WIPP and SERC • Other studies: persistence of energy savings, assessment of under- and over-performers, social network analysis • Information Collection Request has been submitted to OMB for approval. Projecting an early winter start date for data collection.

  3. Indoor Air Quality Findings • Carbon Monoxide • No homes exhibited peak ambient CO problems • Radon • 4% of site-built homes went from below EPA threshold (4 pC/L) pre-wx to above post-wx • Formaldehyde • Net increase of 5.1 ppb post-wx in mobile homes • Temperature • Virtually no change in settings post-wx

  4. Occupant Survey Findings* • Occupants’ reported home temps • Winter: 51% comfortable; 36% cold; 9% very cold • Summer: 62% comfortable; 25% hot; 8% very hot • Occupants’ report health • Asthma: 21% reported; of these 11% ER visits last 12 months • Physical health not good last 30 days: 45% • Mental health not good last 30 days: 34% * From IAQ Study

  5. Program Characterization Findings

  6. Program Characterization Findings: Frequency of Measures Installed (PY08) • Air Sealing - ~95% (e.g., 90% bypass sealing, 75% general caulking, 35% duct sealing) • Insulation - ~75% units (e.g., 70% attic, 25% wall, 20% floor) • Hot Water Measures – 60% units (e.g., 40% pipe insulation, 9% replacement) • Energy Efficient Lights -- ~60% • Furnace Work -- ~45% units {20% tune-up, 20% new system, 10% repair} • Windows – 40% units (e.g., 20% new, 20% glazing, 10% repairs) • Doors – 35% units • Health & Safety – 80% units • CO monitor – 55% • Smoke Alarm – 45% • Ground vapor barrier – 15% • Attic ventilation – 15%

  7. Projected Publication Dates • National Energy Savings Estimates – PY07 & 08: Dec. 2011 • Program Characterization – PY 08: Dec. 2011 • IAQ Winter and Summer Studies: Dec. 2011 • Program Eligibility – PY08: Feb. 2012 • National Occupant Survey – Pre-WX: Feb. 2012 • Case Studies – March 2012 • Field Process Study – March 2012

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