Have you thought about covering your outside A/C during the winter to keep it clean? Someone usually asks me about this every Fall. A cover, similar to the one in the photo, will help keep your unit cleaner, will help protect it from fading in the sun, and may prolong the life of the unit. On the downside, mice may be a problem if the cover is loose where they can climb up and into the inside cavity. They may chew on wires or create a mess building a nest. The biggest downside to adding a cover is that you may forget to remove the cover when it warms up enough to need the A/C. If the A/C unit starts up with the cover over it, damage may occur costing you more than you would have saved. This may be a hard thing to remember each spring! The decision is up to you!