A 250 Home Energy Rating "Case Study" The City of Scottsdale Shares The Results

Transcription

1 A 250 Home Energy Rating "Case Study" The City of Scottsdale Shares The Results Presented By Daran Wastchak, D.R. Wastchak, LLC Presentation Outline 1. Background 2. Overview of audit project 3. Typical findings 4. A closer look at the findings 5. Recommendations & Conclusions 6. Questions & Answers 1

2 Background Scottsdale Green Building program (Anthony Floyd) Five (5) home energy ratings for GreenBuild Phoenix in 2009 Scottsdale received ~ $2.5 million of American Recovery and Reinvestment Act (ARRA) funds Development of $250,000 internal proposal to use ARRA and DOE Energy Efficiency and Conservation Block Grant money for broadened audit/rating program for Scottsdale home owners and small commercial building owners Fall Proposal approved by City Council Background $150,000 devoted to Comprehensive Home Energy Rating for home owners in south Scottsdale 2

3 Background North Scottsdale Background South Scottsdale 3

4 Background $150,000 devoted to Comprehensive Home Energy Rating for home owners in south Scottsdale January RFP issued in January of 2010 April D.R. Wastchak awarded contract for 150 audits City advertises for free audits and in three weeks, fills all 150 spots July Audits begin Summer commercial audits failed so dollars shifted to do 100 more residential audits via contract change order As of February audits completed Overview of Audit Project Comprehensive Home Energy Audit Building Performance Audit (combustion safety testing) Home Energy Rating Ratings run in REM/Rate software Report to homeowner includes: Findings & Recommendations Home Energy Rating Certificate Home Energy Retro-fit Report Estimate of typical improvement costs and average energy savings (allows for rough estimation of cost effectiveness) Information regarding available utility and government incentives and rebates Photos 4

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6 Overview of Audit Project Comprehensive Home Energy Audit Follow-up consultation with homeowners to review report D.R. Wastchak NOT allowed to solicit business to do work Provided information about Home Performance with ENERGY STAR contractor network Very low in-home visit requests DRW Team effort Cristen & Tammy schedule all audits Daniel & David complete audit, REM/Rate file and draft report Daran reviews draft report and finalizes, runs all REM/Rate reports, completes Disclosure Form and assembles final package to go to homeowner Cristen and Tammy send out reports to homeowners Daniel, David or Daran do homeowner follow-up consulation 6

7 Overview of Audit Project Comprehensive Home Energy Audit Information for City to report to DOE on monthly basis: Hours spent on each project work item Number of employees working Savings (using post-improvement REM/Rate file) kwh MMBtu/year Emissions: CO2, SO2, NOx 7

8 Overview of Audit Project Comprehensive Home Energy Audit Survey of homeowners Complete final rating on homes based on actual improvements made DRW contract change order to draft Final Report to DOE Overview of Audit Project 8

9 Typical Findings Typical Findings House Specifications: Built in ,447 square feet 9% Glass (to floor area) Metal frame, single pane, clear windows SEER 10 Heat Pump Evaporative Cooler (removed) T-111 siding, 2x4 framing, R-13 insulation R-19 blown fiberglass attic insulation (average) 9

10 Typical Findings Findings: Leaking building envelope Poor insulation in attic Uninsulated Up Duct Exposed Rafter Typical Findings Findings: Leaking building envelope Poor insulation in attic Uninsulated ceiling area (~107 sf) Over Dining Room: 6 x 6 Over Kitchen: 6 x 10 Up Ducts: 5 x 1 x1 Attic hatch: 2 x3 10

11 Typical Findings Findings: Leaking building envelope Poor insulation in attic Uninsulated ceiling area (~107 sf) Holes in air barrier Typical Findings Findings: Leaking building envelope Poor insulation in attic Uninsulated ceiling area (~107 sf) Holes in air barrier Disconnected duct at old evaporative cooler unit Uninsulated Duct Evap Duct Connection to Main Duct System Cap at Evap Cooler Evap Duct Pushed Into Attic 11

12 Typical Findings Crazy Stuff! Typical Findings Crazy Stuff! 12

13 A closer look at the findings A closer look at the findings Typical/Average Home: Year built: 1966 Square feet (livable): 1,816 Estimated Savings $517 annually $43 monthly 13

14 A closer look at the findings Attic Insulation R-24 AHU HVAC Furnace 79 AFUE Air Conditioner 12 SEER Age of equipment 8 years Lighting Energy efficient (CFL s) 39% Windows Vinyl frames 55% Single pane glass 32% Low E glass 55% Infiltration 0.45 NACH Duct Leakage 15% of CFA Walls Masonry block 72% No wall insulation 75% Combustion Testing Failure Frequency Hot water heater 38% Gas furnace 69% Gas stove 66% CO high 7% Recommendations 90% 86% 80% 70% 72% 60% 50% 40% 30% 20% 45% 36% 34% 33% 28% 10% 19% 17% 0% 12% 10% 4% 14

15 Recommendations Combustion safety issues communicated at time of inspection and always listed first on list. When recommending air sealing, always include recommendation for adding ventilation if sealing will take leakage below 0.35 NACH. Only included recommendations in Retro-fit Report that were at least $10 of savings. Duct leakage always the first recommendation (if no safety issues) because of cost effectiveness. CFL light bulb Recommended air conditioner/furnace change out when unit needs to be replaced Recommendations Only recommended window change outs if single-pane, clear, aluminum framed windows. Did not recommend insulation improvements to walls, except cavity insulation or exterior stucco insulation for block walls without a decorative finish. Always recommended upgrading refrigerator to ENERGY STAR if 20+ years old removing the extra refrigerator from the garage. 15

16 Conclusions Self selection by homeowners (not representative) CFL s s, vinyl-lowe lowe windows Rising standards alone are reducing energy consumption, i.e. HVAC, water heating Homeowners don t really want handholding when reviewing report and audit finds Addition of home energy rating to audit provides quantifiable, directed recommendations Presentation Outline 1. Background 2. Overview of audit project 3. Typical findings 4. A closer look at the findings 5. Recommendations & Conclusions 6. Questions & Answers 16

17 Questions? 17