z wrote:

wrote:

Gases don't radiate, generally, but you might sense lower-temp wood trim.

My house inspector just pointed his at the registers of the furnace/AC
to see how well the air was distributing. I assume after a short time
the solid material equilibrates to the temp of the air going through.

Sure. If you want the room air temp, wave a piece of paper in the air
for a few seconds, then aim at that.

Nick