Nitesun,
I still stick by my view, that if you use foot powder you will be able to wear the boots all the year round.
The comment that your feet will sweat indoors and freeze once you are outside is possibly correct for Norway but not for the UK and can be controlled with Talc.
I have worn the boots in all conditions operating in all weathers with no heater or air-con and still believe they are the best footwear we were ever issued.