Because of their size and/or use of multiple facilities, larger churches offer unique challenges with regards to energy efficiency when compared to a regular congregational facility. It is still important to use energy-efficient products and equipment whenever possible. However, the proper controlling of those energy-efficient products and equipment is going to be crucial in saving energy.
The two systems that are most important to focus on with regards to controlling are the lighting and HVAC systems. These systems account for a large portion of the energy used in a facility and can be a prime area for energy-efficiency upgrades. Utilizing new technology such as time control, zoning, occupancy sensing, and day light harvesting, will have a direct impact in reducing your energy consumption.