It was -8 at midnight, and deteriorated after that. We will work if in high single digits but will abort job if low single digits. I once saw it so cold that I was able to make ice sculptures with 210 degree hot water - it would freeze as it hit the ground. Was lotsa fun. Hose connections froze up and hydro-locked machine during use in hot mode! Never again. I wonder what Mikey from Wyoming is doing. It was minus 28 at midnight in Casper, with 10 degree breeze giving minus 39. Probably got colder after midnight. He is a tough guy so probably worked.
Coldest I have cleaned in this year was -14 and -34 windsheild. It was at a casino and when they pick a date it has to be done no matter what. When you spray down the ducts you cant spray for more than a couple of seconds because you cant even see anymore. They are pretty hardcore there because they have workers up on the roof with us and they even rewired a fan that had faulty wiring that night. After that night when it got to single digits above zero it felt like summer.
I agree with Sean - we had to learn the hard way. If you must work in sub-zero temps then it is important to (1) Always keep water moving through your machine and hoses, and (2) As much as possible do not allow hoses to lay on outside ground surfaces. Even these basic precautions may not be enough - contrary to usual input moving water CAN freeze - we've seen 210 degree hot water freeze in the air as it contacts the ground.
Ya, I'm From Maass and its been pretty cold here low teens and single temps, we've been out banging out jobs left and right, We have valve stems mounted on our pumps and just use a small compressor and blow the machine out at the end of the job. I had one night last week my chemical sprayer tip froze within 30 seconds of being outside. So far tho we've had some pretty good luck. my pant legs were wet when i came off the roof froze before i could get to the bottom of the ladder. Ya i wish we didnt have to work in the cold, tacks on about 25 minutes anyways to the jobs. The pitched roofs are the real fun ones though.