Faulty air conditioning units fail to drain properly and can lead to mold exposure in homes, Midea wans in recall notice.

Midea is voluntarily recalling about 1.7 million of its popular U and U+ Smart air conditioners because pooled water in the units may not drain fast enough, leading to mold growth. The news comes as temperatures are rising across the U.

There have been at least 152 reports of mold in the air conditioners, including at least 17 reports of consumers experiencing symptoms.