The number one issue applicators have during the colder months of the year is cold material. When you have cold material, it will cause the machine to go off-ratio and will cause the machine to shut down/gun cross over. You will then need to spend time fixing all the issues that just happened, thus costing you money. Save time and money by installing hot plates in your rig with a digital monitor, and your drums will always be at the right temp. Hot plates are also the most efficient at heating, as they heat from the bottom, slowly agitating the material . The best part is hot plates increase delta T as well as take strain off the built in machine heaters, giving you higher yield.