Heating and cooling costs an arm and a leg each month. Given the cost, you'd expect total comfort. But the average system operates imperfectly, often leaving some rooms too hot, others too cold. In effect, you’re paying first-class costs for coach-level comfort. The Smart Vent System from Keen Home aims improve both the cost-effectiveness and the performance of your forced-air HVAC system. How does it work? Once installed, the sensor-equipped vents communicate with one another and automatically adjust their louvers to prevent temperature from reaching extremes and to ensure delivery of hot or cool air to the rooms that need it most. Available at Keen Home; $72-$96.