Basic air-conditioner maintenance, such as regularly cleaning filters, can help prevent mold growth. Many window units have a light that indicates when cleaning is needed, but once or twice a month is a good rule of thumb.

The air conditioner sold at Costco, Home Depot and more stores are being recalled due to possible mold exposure. Here's what to do if you own one.

The affected units were sold by Midea as well as under other brand names. If you have a window A/C, here's what you need to know.