cold system here.worked 1030am-330pm.it was hovering around -1 to 0 degrees.no problems apart from the odd frozen window sill which i soon sorted with a bit of extra scrubbing.
hands were nice and warm and dry as i had my glacier "perfect curve" gloves on with liners underneath!
thermobore hose also is still fairly managable at these temperatures even though i use a cold system.
dazmond