gary,,,,,,,,,,, remember,,, the brick you want me to insulate right now is about 35f. there is no insulation in this old building. the times that the "in" temp to my cond coil is when the outside temp is overtaking the inside temp.
next spring we may have this same conversation, lol

ps,,,i brought my electrotherm digital thermometer down tonight,,, and in most cases,, it was within a degree or two of the readings (side by side) with the fieldpiece.
i wonder how often technicians take so many readings so close together. this is more of a pet project for me,, i guess. my first project.
anyhows,, its 1am and time for bed