“Consumers with the recalled air conditioners should immediately contact Midea for a free repair or a full or prorated refund, which will be based on the purchase date or date of manufacture,” the CPSC advised on its site. Air conditioners aside, you could be living in a moldy home without even realizing it.

The Midea U Window Air Conditioner and the U+ Window Air Conditioner were recalled because of pooled water leading to mold growth and health issues.

Midea is recalling 1.7 million air conditioners sold nationwide due to mold risk that can cause respiratory issues. Affected units were sold at Costco, Best Buy, Amazon, and more. Here’s how to check your model and get a refund or repair.