As I posted a long way back in this thread I do not use a dehumidifier,I put a small oil filled radiator in van. I have just been to van and checked Humidity. Exterior 91% Interior 72% External Temp 7deg Internal Temp 10.7deg
Suits me
Mike
http://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/relhum.html
Some light reading on humidity!,
At a higher temperature the RH will drop as the amount of water vapour in the air will be a lower % of the saturated level. The water grms per m3 will remain unchanged.
Now I am going off to get a life and put all this stuff behind me, psychometrics were always a pain and still are!!