The CVC is a high efficiency engine heater capable of reducing generator heating costs by 20,000 - 50,000 kWh annually*. Hotstart's active heat recovery system pulls existing heat from the surrounding air and sends it though a vapor compression cycle, delivering heat to the coolant to maintain engine temperatures while idle. This process is more efficient than generating heat through electrical resistance. CVC systems use significantly less energy to maintain water jacket temperatures than electric resistance based engine heaters.