100% agreed on mileage varying. We are building it to treat the on-time of the system as our cost function with requirements around satisfying temperature (and

100% agreed on mileage varying. We are building it to treat the on-time of the system as our cost function with requirements around satisfying temperature (and humidity) levels. We know that in some homes the return location, duct leakage and numerous other scenarios can cause efficiency gain impedements. But as long as we are tracking how much time the system is on for, respecting the blower motor (pressure sensors) and satisfying the user requirements for occupied (and unoccupied) rooms, we can at least gaurentee an improvement of 0 or greater %. In most cases, the gains are very substantive as the returns generally tend to be in larger open rooms or hallways. Tracking is a key component to our system.