You can't heat a 92° body with 70° heat.

The usual temperature for comfort heating is 70°, but since the human body in a 70° room has a 92° skin temperature (84° clothing temperature)'re not really "heating" the body with that 70° air.

People in a 70° room are helping to heat the room with their 92° skin temperature.

Infrared Heating
is like heat from the sun, but without the ultraviolet. It heats " people" and "objects" not "air" and "space."

How infrared heating "comfort heats" in large buildings.
The lower the air temperature the greater the amount of "convection" heat loss from the body. This radiation loss can be offset by installing overhead infrared heaters. The body will lose by "radiation" and gain by absorbing the overhead radiation.

When you need infrared heating.
In a well insulated building with a low ceiling you can probably supply heat efficiently by convection (warm air blowers, etc.). But as the height of the ceiling increases...especially in poorly built, drafty buildings, convection heating becomes less and less efficient.

Radiant infrared heating, however, since it heats people and objects directly is less affected by drafts and large air movements. So it "makes up" the body loss by radiation more efficiently than warm air, blower- type heating.

Full heating by infrared.
When a complete building is heated by overhead infrared, direct radiation from the heaters pass through the air to heat the floor, walls and machinery. These heated objects then transfer heat to the air by convection and by secondary radiation.

So workers are comfortably located between the direct radiation from the overhead infrared and the secondary radiation from the floor and machinery. Floors stay warm, heat is steady and even without the sharp blasts form blower heat.

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