Crj-700 captain reported loss of pressurization after takeoff.

Attributes
ACN	1681680
Time
Date	201909
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	Regional Jet 700 ER/LR (CRJ700)
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Air Conditioning and Pressurization Pack
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Operating on the right pack only initially. During the climb out we received a right engine bleed air duct warning message. We ran the QRH. Realized that we would not have any pressurization or air conditioning systems with both packs being inoperative so we returned back to ZZZ.we returned due to losing our last pack which caused us to not have any pressurization or air cooling.

Original NASA ASRS Text

Title: CRJ-700 Captain reported loss of pressurization after takeoff.

Narrative: Operating on the right pack only initially. During the climb out we received a right engine bleed air duct warning message. We ran the QRH. Realized that we would not have any pressurization or air conditioning systems with both PACKs being inoperative so we returned back to ZZZ.We returned due to losing our last PACK which caused us to not have any pressurization or air cooling.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.