(07-11-2012 11:06pm)XFullFatTim Wrote: If you run the car with the climate control on then it won't steam up as there is a dehumidifier built into the system. Not running the aircon, even in winter (when you can have hot air con), is a false economy. Not only do you run the risk of the system seizing up and loosing the gas if you don't run it for at least 10 minutes a month on really cold air supply to the cabin which keeps the compressor lubricated, the various ECU's and things like the audio, satnav and various electric things start to suffer from the same "steaming up" as your rear screen. Modern aircon systems don't sap power and increase fuel consumption anywhere near as much as the old systems used to, just run it at 23/24 instead of 20-21 if you want to stay warm. What is the point of paying for climate control if you aren't going to use it?
+1
Never turn mine off, particularly in the winter, unless it's a nice day and I have the windows open in which case having the aircon on is absolutely pointless and counter productive.
Winter demisting is always faster with it on anyway and as Tim mentioned, the economy hit is minimal on the modern systems fitted these days - I doubt you could even measure it.