Air to air heat transfer concept

I am looking for help with an air to air heat transfer concept. The purpose of this concept is to improve energy efficiency by utilizing a ventilation system. We require an estimated medium level of air flow in order to effectively implement the concept. Therefore, we need a consultant or engineer to help with designing and creating this project. We would also like to get an understanding of what the cost and timeline would be for this undertaking. With the right expertise and resources, we believe this concept can be realized and will greatly benefit our business objectives.