While everyone is different , the basics should be:
1. Climb on roof. Looking at AC unit, there will be 4 large screws on top of the AC shroud, remove. Pull shroud off from rear to front.
2. There will be multiple screws in the metal surround, start at the “rear” of the unit and remove screws, working forward. You will likely only need to remove enough screws to flip metal casing forward.
3. Using a ship vac, GENTLY vacuum the fins, being careful to not bend the fins. I use a carpet attachment and gently move up and down.
4. While you are up there, eyeball the pan under the evaporator, if full with water fins the weep hole on one side and clean out.
5. Reinstall in reverse of above.
6. Enjoy some cool AC!!!!
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