> For two, ejecting the gases that have been expensively conditioned for thermal and humidity properties will drive up operating costs since replacement gasses

> For two, ejecting the gases that have been expensively conditioned for thermal and humidity properties will drive up operating costs since replacement gasses will be required. This application optimizes exhaust in rooms with operable, high mounted windows for exhaust. Most rooms with expensive conditioning don't have operable windows, so it's not really an option to use this design for those anyway. In a heavily conditioned space, the expectation would be external air ventilation would be managed near the centralized air handlers. Plenty of options there, like HRV/ERV depending on climate specifics. It might be possible to use a similar design to augment air returns from a conditioning system, but it's going to depends on the system if it would be useful or reasonable.