jsut thought of this article i read yrs ago,,,an old timer got sick of clearing his hole so he took a cofee can and wound small diam cooper tube inside,,coiled,,then brought one end down the outside of the can,,,long enough to reach down in the hole,,,,thought he was nuts,,never tried it,,,he then filled the can w/charcoal,,lit one brickette,and would fish,,,he said the heat awas absorbed down the copper tube and kept his hole slush free for the day....sounds like a neat and cheap idea BUT you need to make sure you have some fresh air coming in or the carbon monoxide will or could kill you,,,,you guys just happened to jog that outa me,,,,if any one tries it let me know.....i have another one ,,,scouts used for cooking...made out of coffee cans,,some small holes,,,house insulation anddenatured alcohol,,,burns so clear you can't see flames,,and cooks great.....good luck ...be safe...