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Credit language
© Copyright U.S. Green Building Council, Inc. All rights reserved.
Requirements
Prerequisites
11.1 Refrigerant charge test. Provide proof of proper refrigerant charge of the air-conditioning system (unless home has no mechanical cooling system).Credits
11.2 Appropriate HVAC refrigerants (1 point). Do one of the following:a. Do not use refrigerants.b. Install an HVAC system with non-HCFC refrigerant (e.g., R-410a).c. Install an HVAC system with a refrigerant that complies with the following equation. (See Table 1 for examples of the equation applied to R410a used in different system sizes.) LCGWP + LCODP x 10^5 ≤ 160 where LCODP = [ODPr x (Lr x Life + Mr) x Rc]/Life LCGWP = [GWPr x (Lr x Life + Mr) x Rc]/Life LCODP = Lifecycle Ozone Depletion Potential (lb CFC11/ton-year) LCGWP = Lifecycle Direct Global Warming Potential (lb CO2/ton-year) GWPr = Global Warming Potential of Refrigerant (0–12,000 lb CO2/lbr) ODPr = Ozone Depletion Potential of Refrigerant (0–0.2 lb CFC11/lbr) Lr = Refrigerant Leakage Rate (0.5–2.0%; default of 2% unless otherwise demonstrated) Mr = End-of-life Refrigerant Loss (2.0–10%; default of 10% unless otherwise demonstrated) Rc = Refrigerant Charge (0.50–5.0 lbs of refrigerant per ton of cooling capacity) Life = Equipment Life (10–35 years; default based on equipment type, unless otherwise demonstrated)Table 1 Examples of Residential Refrigerants Eligible for EA 11.2
Refrigerant |
Combined LCGWP+ LCODP score |
System size |
Refrigerant charge |
Equipment life |
|
|---|---|---|---|---|---|
R410a |
152 |
2 tons |
3.7 lb/ton |
1.5% |
15 years |
R410a |
151 |
3 tons |
3.0 lb/ton |
2.0% |
15 years |
R410a |
151 |
4 tons |
3.0 lb/ton |
2.0% |
15 years |
R410a |
121 |
5 tons |
3.0 lb/ton |
2.0% |
15 years |
What does it cost?
Cost estimates for this credit
On each BD+C v4 credit, LEEDuser offers the wisdom of a team of architects, engineers, cost estimators, and LEED experts with hundreds of LEED projects between then. They analyzed the sustainable design strategies associated with each LEED credit, but also to assign actual costs to those strategies.
Our tab contains overall cost guidance, notes on what “soft costs” to expect, and a strategy-by-strategy breakdown of what to consider and what it might cost, in percentage premiums, actual costs, or both.
This information is also available in a full PDF download in The Cost of LEED v4 report.
Learn more about The Cost of LEED v4 »Frequently asked questions
See all forum discussions about this credit »Documentation toolkit
The motherlode of cheat sheets
LEEDuser’s Documentation Toolkit is loaded with calculators to help assess credit compliance, tracking spreadsheets for materials, sample templates to help guide your narratives and LEED Online submissions, and examples of actual submissions from certified LEED projects for you to check your work against. To get your plaque, start with the right toolkit.
© Copyright U.S. Green Building Council, Inc. All rights reserved.
Requirements
Prerequisites
11.1 Refrigerant charge test. Provide proof of proper refrigerant charge of the air-conditioning system (unless home has no mechanical cooling system).Credits
11.2 Appropriate HVAC refrigerants (1 point). Do one of the following:a. Do not use refrigerants.b. Install an HVAC system with non-HCFC refrigerant (e.g., R-410a).c. Install an HVAC system with a refrigerant that complies with the following equation. (See Table 1 for examples of the equation applied to R410a used in different system sizes.) LCGWP + LCODP x 10^5 ≤ 160 where LCODP = [ODPr x (Lr x Life + Mr) x Rc]/Life LCGWP = [GWPr x (Lr x Life + Mr) x Rc]/Life LCODP = Lifecycle Ozone Depletion Potential (lb CFC11/ton-year) LCGWP = Lifecycle Direct Global Warming Potential (lb CO2/ton-year) GWPr = Global Warming Potential of Refrigerant (0–12,000 lb CO2/lbr) ODPr = Ozone Depletion Potential of Refrigerant (0–0.2 lb CFC11/lbr) Lr = Refrigerant Leakage Rate (0.5–2.0%; default of 2% unless otherwise demonstrated) Mr = End-of-life Refrigerant Loss (2.0–10%; default of 10% unless otherwise demonstrated) Rc = Refrigerant Charge (0.50–5.0 lbs of refrigerant per ton of cooling capacity) Life = Equipment Life (10–35 years; default based on equipment type, unless otherwise demonstrated)Table 1 Examples of Residential Refrigerants Eligible for EA 11.2
Refrigerant |
Combined LCGWP+ LCODP score |
System size |
Refrigerant charge |
Equipment life |
|
|---|---|---|---|---|---|
R410a |
152 |
2 tons |
3.7 lb/ton |
1.5% |
15 years |
R410a |
151 |
3 tons |
3.0 lb/ton |
2.0% |
15 years |
R410a |
151 |
4 tons |
3.0 lb/ton |
2.0% |
15 years |
R410a |
121 |
5 tons |
3.0 lb/ton |
2.0% |
15 years |
