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Maintenance for a window AC unit, like the H14W35W, involves regular cleaning of the air filter (monthly) and annual deep cleaning of coils and fins, while also keeping the unit clean externally and ensuring there are no obstructions. It's crucial to unplug the unit before doing any work. Before storing the unit, drain any accumulated water and allow the interior to dry completely to prevent mold or mildew. Hope this helps! Thank you, TCL Customer Support
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