We typically work on job sites that can often be cool - ambient temeratures around 30 degrees F are not uncommon - We rent a portable, typcially diesel powered air compressor from a local rental company - these units are typicaly rated around 185 CFM etc - we power an air tool to instal threaded fasteners in steel tubing - the air tool requires about 100 psi when running and approiximately 25 SCFM. We have continual problem with tools freezig up. What is the best and most cost efficient way of eliminating or minimizing this problem. Is there a particular type of air dryer that can be recommended. Thanks in advance for your help.