"Hot refers to red in full saturation on the color wheel; this is red at it's strongest. Hot colors project outward and attract attention. No matter what color it is combined with, red can never be ignored. It is the ultimate "power" color - forceful, bold, and extreme. A red room encourages activity and lively conversation, but it is the first color you lose sight of at twilight and is not well seen at a great distance."
-The Complete Color Harmony