Create 3D animation of HVAC components

We manufacture a component that is placed into commercial HVAC rooftop units. The basic function of our product is to recycle energy from exhaust air and route the heating or cooling energy back into the building. So we would want to We already have 3D renderings of our product in AUTO CAD and would want to add our product into a generic 3D rooftop unit to show the intake and exhaust air streams while a narration describes the function and merits of our product. The 3D rooftop unit objects would need to be purchased or created. This notice is really to see what is the price point for getting something useful. This is our first foray into using animation for marketing purposes. Send along examples of your work and price parameters.