comfortility

The quality or amount of comfort something can provide, can enable, or has.
How useful something is in providing or assisting in comfort.

examples:

• consider the comfortility of a cushion.
• lowering a chair to be closer to the floor increases its comfortility.
• a peaceful silent night outside has an abundance of intrinsic comfortility.
• petting a dog has high comfortility potential.
• getting bit by a dog is completely lacking in comfortility.