If you're going to have a sap flow stoppage it's better to have it be because it is too cold. You will get your sap and it's going to come all at once. I'm glad that you are liking the RO. This will be the 11th season with mine if you can believe that. It doesn't seem like it has been that long. It sure is fun drawing a lot of syrup off in a short amount of time isn't it! I've been using about a cord of wood to make 100 gallons of syrup. I don't count how many boiling sodas it takes.