Do you thinnk using relay could be used with a kind of temperature ( and humidity ?) threshold in order to open the current only when it's needed ?
Last night heating seemed to having helped IR working constantly all night long, i'm afraid one minute heating every hour would not be sufficient...
During the day it is different, today it is sunny and the temperature in the box is sqewing the temperature and IR readings.
Last night heating helped the sensor allowing a rapid transition in the middle of the night when the sky has become clearer, usually a change during cold night needs hours to be detected until the morning when the sun removes freeze and humidity
A bad behavior in a clear sunny day with heating in the weather panel, temperature is 6 degreas higher and humidity is too low.
If OCS could stop the current on the heating, appropriate values would come back