Heat Moisture Exchangers (HMEs) are tested to last 3 to 7 consecutive nights and perhaps up to 30 days.  To help prolong the life of your HME, we suggest it be removed after each use and stored in a sealed baggie or sealed container and stored in a cool place, preferably a refrigerator, if available.

You'll want to change the HME when it stops delivering the moisture level you need, so you may want to keep at least one spare HME for use, especially when traveling. 

Click here to purchase additional HMEs.