If you want to store your air conditioner during the winter months, or if you want to prolong the life the unit, then you should install a durable unit cover.
You need to make some measurements in order for the cover to fit perfectly over the unit.
The right materials depends on the climate and use.
If you have a different kind of air conditioning unit that needs a special kind of cover, you can always order a customized one. This is perfect for models with many electric lines or plumbing tubes.
You can also find covers for all seasons, that are for heavy-duty use and also moisture-resistant.
To better secure the cover over the air conditioning unit, use straps.