I have never had any luck using RHPs for ambient air temps they by them selves do not heat air. The result of a long debate was that they can be used to heat heavy objects and that in turn heat the air. It is very easy to prove with the panel on move your hand from away from the panel to directly under it. There is a noticeable and dramatic temperature change under the panel? This indicates it is not heating the air as if it were heat would be much more even. Often people believe the RHP is doing large amounts by measuring 'air' temps under it this is actually not air temps but the surface of the probe as it is a radiant heat system it heats objects not air.