Case Studies

The following properties recently participated in a grant program partially funded by the Department of Energy (DOE) that focused on comprehensive energy efficiency measures in partnership with Austin Energy’s Multi-Family program.  Each property had a third party RESNET rater perform test-in/test-out verifications.

South Congress Commons

Square Footage:  21,099
Year Built:             1979
# of Units:             68

Test-In Avg Total Duct Leakage:
500 CFM = 63% leakage

Test-Out Avg Total Duct Leakage:
38 CFM = 5% leakage

Test-In Avg Duct Leakage To Outside:
338 CFM = 42% leakage

Test-Out Avg Duct Leakage To Outside:
24 CFM = 3% leakage

Test-In Avg ACH:  11
Test-Out Avg ACH:  6

58%
58% Total Duct Leakage Improvement

Austin Gardens

Square Footage:  75,000
Year Built:             1979
# of Units:             150

Test-In Avg Total Duct Leakage:
334 CFM = 55% leakage

Test-Out Avg Total Duct Leakage:
78 CFM = 12% leakage

Test-In Avg Duct Leakage To Outside:
199 CFM = 31% leakage

Test-Out Avg Duct Leakage To Outside:
57 CFM = 9% leakage

Test-In Avg ACH:  14
Test-Out Avg ACH:  7

43%
43% Total Duct Leakage Improvement

Whisper Hollow

Square Footage:  150,160
Year Built:             1983
# of Units:             220

Test-In Avg Total Duct Leakage:
348 CFM = 41% leakage

Test-Out Avg Total Duct Leakage:
46 CFM = 6% leakage

Test-In Avg Duct Leakage To Outside:
254 CFM = 30% leakage

Test-Out Avg Duct Leakage To Outside:
27 CFM = 3% leakage

Test-In Avg ACH:  11
Test-Out Avg ACH:  8

35%
35% Total Duct Leakage Improvement

The Enclave

Square Footage:  48,842
Year Built:             1982
# of Units:             90

Test-In Avg Total Duct Leakage:
171 CFM = 28% leakage

Test-Out Avg Total Duct Leakage:
50 CFM = 8% leakage

Test-In Avg Duct Leakage To Outside:
107 CFM = 18% leakage

Test-Out Avg Duct Leakage To Outside:
28 CFM = 5% leakage

Test-In Avg ACH:  10
Test-Out Avg ACH:  8

20%
20% Total Duct Leakage Improvement
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