If your air conditioner is running but not cooling effectively, it's generally a good idea to turn it off. Continuing to run the AC in this condition can potentially damage the system further or lead to increased energy consumption without any cooling benefit. First, check for any obvious issues like clogged filters or blocked vents that you can address. If the problem persists, it's advisable to turn off the AC and consult a professional HVAC technician to diagnose and repair the issue, ensuring your system operates efficiently and effectively.