I prefer cleaning in winter and get through my work quicker than in summer.
The heat slows me down more than the cold. I only really feel the cold in winter when i ain't moving. Keep working and i'm fine.
It focuses me as well. 9am - 3.30 is plenty of time to earn a decent crust. My 400 litres will only give me between 5 and 6 hours work time anyway.