According to the U.S. Green Building Council, building operations account for 72 percent of electricity consumption. To reduce its impact, the Nature Center uses an integrated approach to heating, cooling, and system controls that maximizes energy efficiency and long term sustainability. High efficiency heating, ventilation, and air conditioning systems help lower overall energy use while maintaining a comfortable indoor environment.
In-floor Radiant or Hydronic Heating:
Fluid heated by the solar thermal system circulates through a network of tubes embedded in the building’s concrete floors. This system delivers consistent, even warmth from the ground up, improving comfort and reducing energy demand.
High Efficiency Furnaces and Cooling Units:
The primary HVAC equipment includes two stage, variable speed furnaces rated at more than 95 percent efficiency, along with 20 SEER air conditioning units. These systems were selected in partnership with Madison Gas and Electric’s engineering department to deliver strong performance and energy savings at a practical cost.
Economizer System:
Heat generated by occupants and equipment can increase indoor temperatures, even during cooler months. When outdoor conditions allow, typically in spring and fall, the economizer brings in fresh ambient air for cooling instead of running the air conditioning system. This reduces electricity use while maintaining comfort.
Air Exchanger:
Air exhausted from the main restrooms passes through an air exchanger that captures and transfers heat to incoming fresh air. For example, when indoor air is about 68 degrees and outdoor temperatures approach zero, heat from the exhaust air is reclaimed to preheat the incoming air. This process reduces the energy required to warm the building.
Integrated HVAC Controls:
An automated control system manages the radiant heating and air conditioning to ensure each operates only when needed and at peak efficiency. The system adapts to changing conditions throughout the day. During cool spring and fall periods, the building may require heating in the morning and cooling in the afternoon. The controls help prevent overheating earlier in the day, reducing the need for excess cooling later.
Air Conditioning Systems:
Cooling in the new facility is provided by two zoned, high efficiency, air cooled condensing TRANE systems. The original building’s cooling unit has also been upgraded to a more efficient model to improve overall performance.
Reflective Roofing:
Part of the roof features a white membrane donated by ABC Supply. Unlike traditional dark roofing, the reflective surface deflects sunlight rather than absorbing it, which lowers the cooling load during the summer months and supports overall energy efficiency.
