They don't decay after they are frozen and as long as they have not been rained on they are easier to feed than unfrozen chips, look at them like 2 sponges, 2 wet sponges will not slide over one another very easily but if they freeze then they are like rubbing 2 ice cubes against one another, warm air is then introduced just before the burn head to thaw the chips and take off the surface moisture. I burned fresh green chips all last winter and had zero issues with frozen chips, summertime use is about 2 months of storage before decay really gets started. I use a 20 foot car hauler trailer with 8 foot sides and front, canvas top for easy top loading and normally have the loggers blow them into the back of the trailer right in the woods, 1 load normally gets me about 1 month of heat for about $100-$150 compare that to about a cord of wood per week in tree length and you have a huge savings not only in $'s but also labor.