Optimal Start is an automated control strategy that calculates when to activate heating or cooling equipment to reach desired setpoint temperatures exactly when the building becomes occupied. Rather than maintaining temperature 24/7 or starting at fixed times, this algorithm adjusts startup based on outdoor temperature, building thermal mass, and occupancy schedules.
Control Algorithm
The system learns building response characteristics through monitoring indoor temperature rise or fall rates relative to outdoor conditions. Sophisticated controllers adjust startup time daily using historical data and weather forecasts. For example, on a 20°F morning requiring 2-hour warmup, the system starts 2 hours before occupancy. On a 50°F morning needing only 30 minutes, it delays startup accordingly.
Energy Savings
Optimal Start reduces heating and cooling run times by 15-30% for buildings with unoccupied periods. Implementation requires a programmable thermostat or building management system capable of learning building thermal lag characteristics. Most effective in commercial buildings with 8-12 hour unoccupied periods and moderate insulation values, delivering annual energy savings of 5-12%.