For years, I have spent a lot of time chipping my water hole open on a daily basis when the temps are real low. This year I got a little bit smarter. I chipped open my water hole then, I took a cooler I bought at Value Village for $2.00, cut the bottom off, placed the bottom below the ice, weighted it down and let it freeze in. I then cover it with snow and it only gets a slight amount of ice on it. The last 3 days the temps. have been -10 to-25 and today I went out and was able to break the ice with my fist. I will provide a pic when the temp. gets warmer.