Seasonal changes and air-conditioning can affect how PAP feels. A room that is warm and humid outdoors may still be cool or dry at night. Your symptoms, room conditions and compatible equipment are more useful guides than a fixed setting assigned to a city.
Humidification adds moisture to the air delivered by PAP. It can help some users with nasal or mouth dryness. It is not a treatment for every cause of those symptoms, and more humidity is not always more comfortable.
Balance dryness and condensation
If you wake with dryness, check the chamber setup and consider whether leak or nasal blockage is contributing. A dry mouth with a nasal mask can accompany mouth leak; increasing humidity alone may not solve it.
If water collects in the hose or mask, humidified air may be cooling and condensing. Check for an overfilled tank or spill as well. Compatible heated tubing can reduce cooling, while changes to approved comfort controls may help find a balance. Follow the model's instructions and the controls your provider has shown you.
There is no universal rule that heated tubing is mandatory in one region or unnecessary in another. If treatment is comfortable and the circuit remains dry, a seasonal change does not automatically require an accessory purchase.
Water and cleaning matter
Use the water type specified for the exact chamber. Do not assume automotive battery-top-up water is suitable for a breathing device, or that household filtration makes water equivalent to the specified supply. Distilled and sterile are different descriptions, and neither eliminates the need for cleaning.
Follow the manufacturer's cleaning, drying and replacement instructions. Do not apply a universal vinegar concentration or dishwasher method across devices. Empty the tank before moving the machine, keep electrical components dry and do not exceed the fill line.
Oxygen equipment is a separate system
A PAP humidifier and an oxygen-concentrator humidifier are not interchangeable accessories. The need for humidification and the approved circuit depend on the oxygen prescription, equipment and patient, particularly in children.
Do not add extra bottles in series, fit a homemade chamber or modify oxygen tubing to increase moisture. Circuit changes can affect delivery. Persistent nasal bleeding, pain or dryness despite the instructed setup needs a clinical and equipment review.
Related reading: Water in the CPAP hose: how to address rainout