ACCA Quality Homes ACCA 12 QH 2011 (Existing Home Evaluation and Performance Improvement) Developed in cooperation with RESNET Wes Davis Director, Quality Assured Program Air Conditioning Contractors of America 2012 RESNET Conference Austin, TX 28 February 2012
The Air Conditioning Contractors of America (ACCA) The only nationwide association representing the technical, educational and policy interests of U.S. businesses that design, install and maintain indoor environmental systems
Antecedents National Warm Air Heating and Air Conditioning Assn. (1914) Air Conditioning and Refrigeration Contractors of America (1946) National Environmental Systems Contractors Assn. (1968) Air Conditioning Contractors of America (1969)
Mission Statement To assist and enable HVACR contractors to acquire, serve and satisfy their customers.
Approach Contractor Support Consumer Assistance Government Relations Industry Relations Technical Expertise
Membership About 5,000 Members In all 50 States and 12 foreign countries 43 Chapters across America
Projects Under development Manual S (Residential Equipment Selection) Numerous Technical Bulletins Recent publications Manual Zr (Residential Zoning Manual) Manual SPS (Swimming Pools and Spas) Manual B (Balancing and Testing Air and Hydronic Systems) 4 year Apprenticeship Manual
ACCA 12 QH: Background Existing documents were lacking HVAC efficiency HVAC industry combustion safety Standard language Industry stakeholders requested a document that could be used and enforced.
ACCA 12 QH: Overview Purpose Scope Appendices Free PDF download www.acca.org/quality
Purpose ACCA 12 QH: Overview Set minimums Requirements Procedures Documentation Information collection: audit Information assessment: identify improvements Information presentation: scopes of work Work performed to standards Work evaluated on completion
ACCA 12 QH: Overview Scope Site built or manufactured Single- or Two- Family Townhouses 3 Stories and less
ACCA 12 QH: Overview Appendices Appendix A: Procedures Appendix B: Additional Elements Appendix C: Tables Appendix D: Definitions Appendix E: Bibliography
ACCA 12 QH: Overview Comprehensive Audit Interview Onsite Data Collection Health and Safety (fossil fuel appliances) Envelope Ventilation Insulation Heating and Cooling systems Water Heating Fenestration Appliances and equipment Plumbing fixtures Moisture Pools and Spas Documentation
Interview ACCA 12 QH: Overview Comprehensive Audit Why an interview What to learn Not the only questions
ACCA 12 QH: Overview Comprehensive Audit Onsite Data Collection Information for energy modeling
ACCA 12 QH: Overview Comprehensive Audit Health and Safety (fossil fuel appliances) CO Testing Combustion appliance flue gases Accessible venting system Combustion Appliance Zone Gas/Oil Leakage Unvented Combustion Appliances Combustion Appliance Zone Volume Depressurization Test Combustion Appliance Venting
ACCA 12 QH: Overview Comprehensive Audit Health and Safety (fossil fuel appliances) CO Testing Combustion appliance flue gases Accessible venting system Combustion Appliance Zone Gas/Oil Leakage Unvented Combustion Appliances Combustion Appliance Zone Volume Depressurization Test Combustion Appliance Venting
ACCA 12 QH: Overview Comprehensive Audit Health and Safety (fossil fuel appliances) CO Testing Combustion appliance flue gases Accessible venting system Combustion Appliance Zone Gas/Oil Leakage Unvented Combustion Appliances Combustion Appliance Zone Volume Depressurization Test Combustion Appliance Venting
ACCA 12 QH: Overview Comprehensive Audit Health and Safety (fossil fuel appliances) CO Testing Combustion appliance flue gases Accessible venting system Combustion Appliance Zone Gas/Oil Leakage Unvented Combustion Appliances Combustion Appliance Zone Volume Depressurization Test Combustion Appliance Venting
ACCA 12 QH: Overview Comprehensive Audit Health and Safety (fossil fuel appliances) CO Testing Combustion appliance flue gases Accessible venting system Combustion Appliance Zone Gas/Oil Leakage Unvented Combustion Appliances Combustion Appliance Zone Volume Depressurization Test Combustion Appliance Venting
ACCA 12 QH: Overview Comprehensive Audit Health and Safety (fossil fuel appliances) CO Testing Combustion appliance flue gases Accessible venting system Combustion Appliance Zone Gas/Oil Leakage Unvented Combustion Appliances Combustion Appliance Zone Volume Depressurization Test Combustion Appliance Venting
Envelope ACCA 12 QH: Overview Comprehensive Audit Measure the envelope leakage
Ventilation ACCA 12 QH: Overview Comprehensive Audit What should be the ventilation rate?
Insulation ACCA 12 QH: Overview Comprehensive Audit What is there?
ACCA 12 QH: Overview Comprehensive Audit Heating and Cooling systems Validation of Capacity to Load If the equipment is to be replaced Airflow Distribution System Temperature Difference Room Temperature Difference Duct Leakage Testing Room-Pressure Difference
ACCA 12 QH: Overview Comprehensive Audit Heating and Cooling systems Validation of Capacity to Load If the equipment is to be replaced Airflow Distribution System Temperature Difference Room Temperature Difference Duct Leakage Testing Room-Pressure Difference
ACCA 12 QH: Overview Comprehensive Audit Heating and Cooling systems Validation of Capacity to Load If the equipment is to be replaced Airflow Distribution System Temperature Difference Room Temperature Difference Duct Leakage Testing Room-Pressure Difference
ACCA 12 QH: Overview Comprehensive Audit Heating and Cooling systems Validation of Capacity to Load If the equipment is to be replaced Airflow Distribution System Temperature Difference Room Temperature Difference Duct Leakage Testing Room-Pressure Difference
ACCA 12 QH: Overview Comprehensive Audit Heating and Cooling systems Validation of Capacity to Load If the equipment is to be replaced Airflow Distribution System Temperature Difference Room Temperature Difference Duct Leakage Testing Room-Pressure Difference
ACCA 12 QH: Overview Comprehensive Audit Heating and Cooling systems Transfer Validation of Capacity to Load If the equipment is to be replaced Airflow Transfer Distribution System Temperature Difference Grilles Room Temperature Difference Duct Leakage Testing Room-Pressure Difference Duct Ducted Return (Hall) Cased Opening
ACCA 12 QH: Overview Comprehensive Audit Water Heating
ACCA 12 QH: Overview Fenestration Comprehensive Audit North? South? Southwest?
ACCA 12 QH: Overview Comprehensive Audit Appliances and equipment
ACCA 12 QH: Overview Comprehensive Audit Plumbing fixtures
Moisture ACCA 12 QH: Overview Comprehensive Audit
ACCA 12 QH: Overview Comprehensive Audit Pools and Spas
ACCA 12 QH: Overview Comprehensive Audit Documentation
ACCA 12 QH: Overview Assessing Improvements Benchmarks Table 2 Suitable substitutions Evaluation
ACCA 12 QH: Overview Assessing Improvements Evaluation Cost / Benefit Analysis (energy conservation) Historical knowledge Fixed price proposals revise priorities Prices based on industry standard compliance Note: Historical trueing up $ $
Evaluation ACCA 12 QH: Overview Assessing Improvements Additional Elements Age Condition Hazardous materials Cascading requirements Flashing Sheathing Siding Permit Wiring
ACCA 12 QH: Overview Presenting Improvements Prioritizing Presenting Requirements Documentation
ACCA 12 QH: Presenting Improvements Prioritizing First: Combustion safety CO Fuel Leaks Unlisted unvented combustion appliances (primary heat source)
ACCA 12 QH: Overview Presenting Improvements Prioritizing Second: Ventilation and Moisture issues
ACCA 12 QH: Overview Presenting Improvements Prioritizing Third: Energy savings Largest energy savings Best cost to best benefit
ACCA 12 QH: Overview Presenting Improvements Prioritizing Fourth: Comfort, IAQ, Durability
ACCA 12 QH: Overview Presenting Improvements Presenting Owner interaction Presented by priority Chosen by Owner Adverse effects Tightened envelope Combustion Appliances Moisture
ACCA 12 QH: Overview Presenting Improvements Requirements (Thou shalt ) Codes HVAC sized for changes Duct leakage (before and after) Energy savings estimated Bids to standards (Section 6.0) Require test-out (Section 7.0)
ACCA 12 QH: Overview Presenting Improvements Requirements (Thou shalt ) Identify your software Recommend Radon testing Recommend allergen testing Include envelope test after remediation of hazardous materials CO detectors in bedrooms with combustion appliances
ACCA 12 QH: Overview Presenting Improvements Documentation Findings and benchmarks Scopes of Work Cost/benefit analysis information Signed release
ACCA 12 QH: Implementing Improvements Safety Envelope Ventilation Insulation HVAC Fenestration Appliances Plumbing Moisture Pools and Spas
ACCA 12 QH: Implementing Improvements Safety CO, spillage and drafting issues Combustion air CO detectors Radon testing
ACCA 12 QH: Implementing Improvements Envelope Air sealing to reduce stack effect inhibit moisture Thermal and pressure boundary Leakage paths to garages Leakage paths (enclosed cavities) 15% rule Attic venting per code Lead: EPA Renovation, Repair, and Painting
ACCA 12 QH: Implementing Improvements Ventilation ASHRAE 62.2 and IECC 2009 OEM instructions, codes, industry practices Measured Effective thermal/pressure barrier before attic venting
ACCA 12 QH: Implementing Improvements Insulation OEM recommendations or standards Moisture remediation and air barrier before insulation 15% rule Document material and R-value Vented eaves and soffit baffles Pitched ceilings and Loose fill insulation Dense pack Unvented flat roof
ACCA 12 QH: Implementing Improvements HVAC Install to QI Maintain to QM Restore to QR Ducts outside thermal envelope New ventilation Installed per OEM Balanced to design Comply with IRC
ACCA 12 QH: Implementing Improvements Fenestration: ASTM E2112 Appliances: OEM instructions and Code Plumbing: OEM instructions and Code Moisture: Find and fix the source
ACCA 12 QH: Implementing Improvements Pools and Spas: Suction outlet covers Energy efficient components per ANSI/ICC/APSP 15 and IRC Pool covers per APSP New HVAC systems for indoor pools per ACCA SPS
ACCA 12 QH: Test out Independent Auditor Per the signed proposal Envelope tightness improvements = Combustion appliances tested
ACCA 12 QH: Appendix A Appendix A: Procedures
ACCA 12 QH: Appendix B Appendix B: Additional Elements
ACCA 12 QH: Appendix C Appendix C: Tables
ACCA 12 QH: Appendix D Appendix D: Glossary
ACCA 12 QH: Appendix E Appendix E: Pertinent Bibliography and Resources
Conclusion ACCA 12 QH: Overview A need identified A standard written Refined by public review www.acca.org/quality
ACCA 12 QH: Wesley R. Davis wes.davis@acca.org (703) 824-8877