1. Retrofit PTCS Duct Sealing SGC Manufactured Homes Energy Savings Analysis

2. The Issue Current RTF Assumption: All SGC homes have tight ducts: But utilities are finding homes that were certified as SGC that need duct sealing.

3. SGC/NEEM Specification History 1992 – SGC spec (MAP) - prescriptive duct sealing requirement. 1997 – SGC specs updated to require butyl tape 2004 – SGC specs updated to require mastic and duct testing of each floor in the factory. Before 2004, is there much difference in the duct tightness of a SGC home and a nonSGC home?

4. Utility Data Show a Need for Sealing Grays Harbor PUD Data 20 homes total All SGC or Energy Star – 9 from pre 2004 5 needed sealing – 11 from post 2004 0 needed sealing EWEB Data Of 295 certified homes tested, 67% needed sealing

5. Then What’s the Baseline for SGC? There’s some data… (cfm25 to exterior/sq.ft.) n33 Min3% Median15% Average21% Max90% Std. Dev.19%

6. CC and Ecos Databases Only homes in CC Data base w/100 CFM@ 50P Reduction N=1487 Pre CFM/SF @ 25 Pa Mean 0.20 Median 0.16 Std Deviation 0.13 Mode 0.22 25% Percentile 0.12 75% Percentile 0.24 Ecos/PTCS Manuf. Homes with a leakage reduction N=938 Pre CFM25/sq.ft. minimum1% average24% median15.2% maximum364% std. dev.29%

7. Recommendation Use the same leakage as nonSGC homes for SGC homes (originally from CC data). Procost Full Measure Name Annual Savings @ Site (kwh/yr) Societal Benefit / Cost Ratio Manufactured Home SGC Electric Forced Air Furnace w/CAC - PTCS Duct Sealing Heat Zone 3 - Cool Zone 111082.3 Manufactured Home SGC Electric Forced Air Furnace w/CAC - PTCS Duct Sealing Heat Zone 2 - Cool Zone 18091.7 Manufactured Home SGC Electric Forced Air Furnace w/CAC - PTCS Duct Sealing Heat Zone 1 - Cool Zone 14180.9 Manufactured Home SGC Electric Forced Air Furnace w/o CAC - PTCS Duct Sealing Heat Zone 310952.3 Manufactured Home SGC Electric Forced Air Furnace w/o CAC - PTCS Duct Sealing Heat Zone 27961.6 Manufactured Home SGC Electric Forced Air Furnace w/o CAC - PTCS Duct Sealing Heat Zone 14060.8 Manufactured Home SGC Heat Pump - PTCS Duct Sealing Heat Zone 3 - Cool Zone 13410.8 Manufactured Home SGC Heat Pump - PTCS Duct Sealing Heat Zone 2 - Cool Zone 12340.6 Manufactured Home SGC Heat Pump - PTCS Duct Sealing Heat Zone 1 - Cool Zone 11160.3