You cannot see radiant heating energy but you can certainly feel radiant heat; and it feels good! Radiant heat is like sunshine, or warmth from a fire; it just makes you feel more comfortable and cozy.
The sensation of comfort is caused by a combination of air temperature and radiant energy that equals the body’s energy needs. When you receive a greater amount of radiant energy, you will be equally comfortable at a lower air temperature. It’s like being out in the sunshine. This lower air temperature will save you money on your energy bills.