1. Inspect the Unit

• Check for signs of damage, rust, pests, or mold.
• Inspect the power cord and plug for fraying or wear.

2. Clean the Unit Again

• Dust off the exterior and vacuum the vents.
• Wash or replace the air filter.

3. Optional: Schedule a Tune-Up

• Have a certified technician inspect and test the unit, especially if it’s older or was unused for a long period.
  Preventative maintenance can improve efficiency and extend the unit’s lifespan.

4. Test the Unit

• Plug it in and run it on a test cycle before installing it in the window.

5. Install the A/C in the Window

• Secure the unit with support brackets or foam seals.
• Install side panels to block drafts and insects.
• Tilt the unit slightly backward if required for drainage.

6. Final Checks

• Ensure the unit cools properly and operates without unusual noise.