For you reference we have included our latest instruction manuals. These can be downloaded for you to print out for future reference. If, after reviewing your AIR-O-SWISS product manual, you still have questions about the proper use of your humidifier please consult the Frequently Asked Questions section (FAQs) of our website for answers. If you can not find the answer to your question please contact your local AIR-O-SWISS retailer or use the Contact AIR-O-SWISS link to send your question to a knowledgeable representative who will be happy to provide you with an answer. Choose between Instruction Manual (English, French or Spanish) or Quick Setup Guide: