Robuk says: November 20, 2013 at 1:07 pm We drive by a building which houses a company selling solar panels, on the wall is a thermometer display, it is always reads differently to our car, The display as we passed recently (on a dull day) read 9C degrees our car read 8C, On one pass recently (sunny day this autumn) the display read 21C, the car display read 14C.