R405. ADDITIONAL EFFICIENCY PACKAGE

R405 ADDITIONAL EFFICIENCY PACKAGE R405.1 Requirements. New buildings shall comply with at least one of the following: Enhanced HVAC performance in accordance with Section R405.2. Enhanced Building Envelope in accordance with Section R405.3. Enhanced Air Leakage and Heat Recovery Ventilation in accordance with Section R405.4. Enhanced Water Heating System in accordance with Section R405.5. Exception: Alterations are exempt from Section R405. R405.2 Efficient Heating and Cooling Systems. All heating and cooling equipment shall meet the minimum efficiency requirements of Table R405.2. TABLE R405.2 Equipment Type Efficiency Split and Packaged Air Conditioners ≥ 15 SEER a Split and Packaged Air Source Heat Pumps ≥ 15 SEER a, ≥ 9.0 HSPFb Gas-fired Furnace ≥ 90% AFUEc and Furnace Fan Efficiency ≤ 2.0% or Electronically Commutated Motor (ECM) Gas-fired Boiler ≥ 90% AFUEc Ground Source Heat Pump ≥ 17.1 EERd and ≥ 3.6 COPe SEER - Seasoaa. SEER – Seasonal Energy Efficiency Ratio HSPF – Heating Seasonal Performance Factor AFUE – Annual Fuel Utilization Efficiency EER – Energy Efficiency Ratio COP – Coefficient of Performance R405.3 Enhanced Building Thermal Envelope. Building Thermal Envelope shall comply with Table R405.3 in addition to Table R402.1.2. TABLE R405.3 INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENT FENESTRATION Windows = 0.24 U-Factor ENERGY STAR Compliant Doors SKYLIGHT U-FACTOR 0.45 U-Factor GLAZED FENESTRATION SHGC 0.40 Solar Heat Gain Coefficient (SHGC) CEILING R60 MASS WALL U-factor less than or equal to .035 or R-19 cavity + R-10 continuous, or R-13 in cavity + R-15 continuous, or R-25 continuous WOOD FRAME U-factor less than or equal to .035 or R-19 cavity + R-10 continuous, or R-13 in cavity + R-15 continuous, or R-25 continuous METAL FRAME WALL U-factor less than or equal to .035 CONTINUOUS SLAB INSULATION R10 continuous R405.4 Enhanced Air Leakage and Heat Recovery Ventilation. Buildings shall meet the minimum air leakage requirements of Table R405.4 and install a heat or energy recovery ventilation system. TABLE R405.4 AIR LEAKAGE TESTING REQUIREMENTS New construction Single family detached, two family attached (duplex), townhouses, flats 2 ACH50 Dwelling units in Multifamily buildings 3 stories and less .25 CFM50/SF enclosure area of each unit or 2 ACH50 R405.5 Efficient Appliances and Water Heating. All refrigerators, freezers, dishwashers, clothes washers, and ceiling fans must be ENERGY STAR Qualified, and water heater(s) shall meet the minimum efficiency requirements of Table R405.5. TABLE R405.5 MINIMUM EFFICIENCY FOR WATER HEATERS Equipment Type Efficiency Gas Storage Water Heaters ≥ 0.90 Energy Factor (EF) Tankless Water Heaters ≥ 0.95 Energy Factor (EF) with electronic ignition Electric Water Heaters ≥ 2.2 Energy Factor (EF) SOURCE: Final Rulemaking published at 67 DCR 6326 (May 29, 2020 – Part 2); as amended by Final Rulemaking published at 68 DCR 7439 (July 30, 2021). The District of Columbia Energy Conservation Code (2017), referred to as the “Energy Conservation Code,” consists of ANSI/ASHRAE/IES 90.1-2013, Energy Standard for Buildings Except Low-Rise Residential Buildings (ASHRAE 90.1) and substantial portions of Chapter 7 of ANSI/ASHREA/IES 189.1-2014, Standard for the Design of High-Performance Green Buildings Except Low-Rise Residential Buildings (ASHRAE 189.1), published by the American Society of Heating, Refrigeration and Air-Conditioning Engineers (ASHRAE), and the Residential Provisions of the 2015 edition of the International Energy Conservation Code (International Energy Conservation Code), published by the International Code Council (ICC), as amended by the Energy Conservation Code Supplement of 2017 – Commercial Provisions (12-I[CE] DCMR) and the Energy Conservation Code Supplement of 2017 – Residential Provisions (12-I[RE] DCMR). The International Energy Conservation Code is copyrighted by the ICC and therefore is not republished here. However, a copy of the text may be obtained at: https://codes.iccsafe.org/public/document/IECC2015. ASHRAE 90.1 is copyrighted by ASHRAE and therefore is not republished here. However, the text of ASHRAE 90.1 may be reviewed at: https://www.ashrae.org/standards-research--technology. Portions of Chapter 7 of ASHRAE 189.1 are reprinted in the District of Columbia Energy Conservation Code Supplement by permission of ASHRAE and ICC. District of Columbia Municipal Regulations Energy Conservation Code Supplement of 2017 – Residential Provisions 12-I[RE] DCMR § R405