We have a Hymer Excis-i which we keep on the drive, plugged in, over winter. We use a small greenhouse fan heater set at 13 degrees c to keep the van dry and warm. The massive increases in energy costs are causing us to review this - so what to do for the best? We have an external silver screen for the front - but can we leave it on all winter? We have some lorry thermal blinds stuff that we quickly drape under the windscreen wipers when its blazing hot - what is we got some of the stuff and cut it to fit the other windows and roof vents? In my greenhouse i use bubble wrap - same issues - would that be a decent expedient - stuffed between the window blinds and the windows? All contributions gratefully received