I'm at the point with the cab I'm building that I need to decide on how to heat it. I've read where some have brought back heat using a heater housing arrangement. Does this work well? Does it keep the windshield clear? +'s and -'s? I have also read where people have installed heaters off the engine cooling system. This is do-able since I have available ports off the water pump. Maybe someone out there has done both and can share their experience. Thanks