Several months ago I purchased a regular-sized MistAire Humidifier and shortly thereafter I received a large XL model as a gift. Both have performed beyond my expectations.
                    The smaller version, I placed in the living room which I use less frequently and is of lesser volume. The XL version, I placed in the Bedroom wherein I spend more time and is the larger room.
                    The XL unit in the Bedroom, set at Mode 3 High Speed, maintains the humidity at 40-50%, according to the outside humidity. I've also noticed that my coughing from COPD and random body itching from dry skin, have decreased significantly.
                    At age 97, I have found both units convenient to maintain.