WHY CHOOSE GREEN APU? 26,000 heating & cooling BTU's - Twice as many as the main competitors. The unit automatically switches between cooling and heating, set it and forget it. GAPU counteracts cold weather problems! The unit will automatically start and warm the truck’s main engine if the coolant drops below 32F. Battery Charging Mode (BCM) - In BCM the unit automatically starts & charges the truck batteries when the truck is not in service over days, weeks, or months. Conserve Fuel & Conserve DPF - GAPU burns approximately 1/4 gallon of fuel per hour on average. Go longer between regens and filter replacement. DURABILITY- With the 3-cylinder Kubota engine GAPU runs at a lower RPM reducing noise and vibration. GAPU comes with lifetime 24/7 tech support and a 2-year warranty. LOWEST COST TO OWN - Parts for GAPU are available through local autopart stores. No expensive captive parts. Quiet! With a newly designed muffler and larger air filter, the unit is by far the quietest APU on the market at 43 decibels - slightly louder than water running in a kitchen sink. Unbeatable Price! - GAPU installed comes in under TK or Carrier!