If the boiler doesn't operate for long periods, install a demand control switch that keeps the boiler off until a building thermostat calls for heat. In cold climates, install a freeze override switch, so the water won't freeze when the boiler is off. Timing controls . Install a seven-day clock thermostat to provide daily start and stop times for heating and cooling. If you use a heat pump, consider microprocessor regulation of temperature changes.
Demand controls .
If more sophisticated control of heating and cooling in your facility is necessary, install a system that manages electric demand by load control. You can reduce this by 50 percent if the space is not used for more than three hours at a time. Bryan Ralston, church project manager for Morton Buildings, says that proper ventilation is especially important in sanctuaries and other areas of high density seating. He advises churches to install sensors that let in outside air when inside air becomes polluted or stale. Some of the information in this article was taken, with permission, from that book.