Heated Tubing
Perhaps the most desirable option is to use a heated tube that delivers the warm, moist air from the heated humidifier to the CPAP mask. This will maximize the benefit of the humidifier. All of the major manufacturers of CPAP equipment now offer heated or climate line tubing as part of their latest models. These have a heated coil that run the length of the tube and keep the air inside warmed. The power is integrated into the back of the CPAP machine and the tubing easily connects to the various mask interfaces. In addition, it is possible to purchase a separate heated tubing component called Hybernite to use with older machines. In general, it is recommended to set the temperature of the tubing between 78 and 82 degrees to reduce the likelihood of water forming in the equipment.
Changing the Temperature Difference
A less expensive and simple option is to adjust the temperature of the heated humidifier or your bedroom. Turn down the temperature of the humidifier or turn up the thermostat in your bedroom. You may find that it is more comfortable to sleep in a cool room, so you might start by adjusting the humidifier.
Covering the CPAP Tubing
Another popular option is to put the CPAP tubing under the bed covers.
This will warm the tube and reduce the condensation. There are also various fabric coverings sold that can insulate the tubing as well. The most popular brand is sold as SnuggleHose. These come in various colors, patterns, and fabrics. If you are crafty, similar covers can be made easily with a long piece of fabric and a sewing machine or needle and thread.