Independent HVAC Contractor Needed

I'm looking for an experienced HVAC contractor to repair my central air system, which is less than 5 years old. The system is currently not cooling.

Ideal skills and experience:
- Certification in HVAC systems
- Proven experience with central air repair
- Ability to diagnose and fix "no cooling" issues
- Good customer reviews and reliability

Please provide a detailed bid including your approach and estimated timeline.