They began with installing new Outside Air Optimization Economizer controls from 75F. Additionally, smart thermostat upgrades were added for each unit to allow for remote monitoring and control, as well as advanced scheduling and setback capabilities.
Advanced Outdoor Air Optimization works to limit the excessive outside air conditioning in addition to increasing the use of outside air during the spring and fall seasons when ideal conditions are present. 75F OAO is equipped with cloud computing data storage and processing power and is much more efficient than the standard economizer controller found in existing units. On average, the system provides almost 3x “free cooling” economizer hours per year versus a standard enthalpy economizer.
The site used a simple prescriptive rebate from Xcel Energy, providing $20 a ton for Advanced Economizer Controls ($4,400), and $100 per RTU ($2,200) for the addition of CO2 monitoring, bringing the total utility rebates to $6,600. With EnergyPrint’s Utility Dashboard as a guide, HOM benchmarked this building’s performance to monitor its monthly progress and validate savings results.