Homes-v4 EAc11: Heating and cooling distribution systems 2-3 points
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Credit language
© Copyright U.S. Green Building Council, Inc. All rights reserved.
Intent
To minimize energy loss to thermal bridges and leaks in the heating and cooling distribution system.Requirements
Case 1. Forced-Air System
Option 1. Ductwork in Conditioned Space (3 points)
Duct leakage testing is waived if the following conditions are met:- The air-handler unit and all ductwork are located entirely within conditioned spaces.
- The envelope is airtight; 2 points are earned in EA Credit: Air Infiltration.
OR
Option 2. Ductwork in Unconditioned Space (2 points)
Large Homes or Multifamily Units For homes or multifamily units of 1,200 square feet (110 square meters) or more, limit the rate of duct air leakage to outside the conditioned envelope. For each installed system, the tested duct leakage rate must not exceed 3.0 cfm at 25 Pascals per 100 square feet (0.9 cmm at 25 Pascals per 100 square meters) of conditioned floor area. Small Homes or Multifamily Units For homes or multifamily units smaller than 1,200 square feet (110 square meters), limit the rate of duct air leakage to outside the conditioned envelope. For each installed system, the tested duct leakage rate must not exceed 4.0 cfm at 25 Pascals per 100 square feet (1.2 cmm at 25 Pascals per 100 square meters) of conditioned floor area.Case 2. Hydronic System (2–3 points)
Keep the system (including boiler and distribution pipes) entirely within the conditioned envelope (2 points). For an additional point, install an outdoor reset control that modulates distribution water temperature based on the outdoor air temperature (1 point).What does it cost?
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Credit language
© Copyright U.S. Green Building Council, Inc. All rights reserved.
Intent
To minimize energy loss to thermal bridges and leaks in the heating and cooling distribution system.Requirements
Case 1. Forced-Air System
Option 1. Ductwork in Conditioned Space (3 points)
Duct leakage testing is waived if the following conditions are met:- The air-handler unit and all ductwork are located entirely within conditioned spaces.
- The envelope is airtight; 2 points are earned in EA Credit: Air Infiltration.
OR