I honestly don't know when they will be available for sale; best to wait on Brandon's reply to your email.
Temps are pretty wide. Some of it will depend on which, of 3 different designs he has been fiddling with, he chooses. I've tried all 3 and believe that they can all go to 30F-35F for most folks. I've been down in the mid 20s with them and was fine, but I'm a little off from most on temp ratings. I have a good furnace.
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