Get your semi truck Ready for the Road Ahead™ with a warm and cozy cabin, with the Phillips Temro Model 300 Cab & Cargo Heater. Thanks to its compact design that fits in tight enclosures, this replacement heater is the ideal option to warm an enclosed cabin or cargo space. Symptoms of a heater that needs to be removed and replaced include cold air, foggy windows, and rattling noises. FleetPride is your First Click in Heavy Duty®.