Typical central air systems for homes have a fatal flaw – a single thermostat for the entire floor if not the entire house. You then typically end up with different rooms being at different temperatures.
Today’s technology lets you manage this problem cheaply. Snag a bunch of wireless sensors and deploy them around the home. They in turn report back to a central system that you can monitor to figure out where you may need to improve the insulation and/or adjust the airflow into that room.
You may be able to take it a step further by having the vents motorized and automatically controlled to open/close based on temperature thresholds.
You can find more details at Embedded.com.