Economizer: Alternate HVAC and fan-only

[structure7]

Might need to be a new mode to select... Whole-house cooling econ maybe?

Idea is: HVAC always runs first after entering cooling mode. Or, always run first after a setpoint change. After HVAC shuts off (setpoint is reached) that runtime is recorded. When a room calls for cooling again, this time the fan-only mode runs for the same duration that the previous HVAC ran for, then returns to a state ready for HVAC to start again. This loops.

Reason for this is that the cooling in the house is lopsided. This will help to introduce cold air, then circulate air from the cold rooms to the warm ones when cooling is called.

[structure7]

Another option here might be true occupancy-based zoning. Maybe by default, the t-stat controls temps as expected. Near each room's light switch, a pushbutton will trigger allowing that room into the pool of rooms that cool based on setpoint. That selection ends after 1 hour, unless it's "sleeping hours" then all rooms are in the pool until say 7am.

[structure7]

Before buttons get installed in every room: Maybe keep the idea of cycling, but add some sort of logic to see the highest and lowest temps in the house. Example: AT is 74 and KK is 79. Because 79-74=5 (or it could be 4) there is enough cold air "stored" in the house to warrant trying to circulate it. Then, during fan only, if hotRoom's temp, instead of lowering or holding, raises 2-3 above setpoint, then back to HVAC.