This tender invites qualified contractors in Hyderabad under the Pakistan Airports Authority (PAA), ES E&M Sindh Division, CATI for HVAC system upgrades. The scope covers replacement of underperforming air conditioning units at the Medical Center, Masjid, and Madarasa within the CATI complex. The project demands experienced contractors with PEC registration in category C-6 or above, specializing in mechanical and electrical engineering fields ME-01 and EE-04. The work involves removal and installation of AC units ensuring improved cooling efficiency and reliability. Contractors must consider site constraints within the CATI Hyderabad premises and ensure compliance with technical specifications and safety standards. The tender follows the Single Stage – Two Envelope Procedure on the PPRA E-PADS portal, requiring electronic submission alongside a sealed original Earnest Money instrument. Bidders should hold valid NTN and Professional Tax certificates and maintain active PEC registration. The tender emphasizes adherence to FBR/ATL compliance and PEC category requirements for the 2025-26 financial year. Contractors are advised to prepare their technical and financial bids carefully, ensuring all documentation is accurate and complete to avoid disqualification. Submission deadline is on the 22nd of January 2026, with bid opening scheduled at 1400 hours on the same day. Bids must be submitted electronically via the PPRA E-PADS portal, with the original Earnest Money instrument delivered physically at the Divisional Engineer ES E&M Office, CATI Hyderabad. Pro-Tip: Ensure the Earnest Money instrument is genuine and properly sealed, as any dishonored financial instruments will lead to blacklisting and legal action. Double-check the PPRA E-PADS portal guidelines for bid submission to avoid common pitfalls related to electronic tendering.