Multi-Family Case Studies
"The Proof is in the Pudding!"
The following properties 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. The data reflects comprehensive duct sealing and thermal boundary measures. Note: ACH stands for Air Changes per Hour, CFM stands for Cubic Feet of Air Flow per Minute.
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
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
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
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