The cost implications for ECM isolation depend on how many meters are installed and the complexity of the systems being monitored. If systems are easily isolated and don’t require many meters, this credit can be relatively inexpensive to achieve, and Opti

The cost implications for ECM isolation depend on how many meters are installed and the complexity of the systems being monitored. If systems are easily isolated and don’t require many meters, this credit can be relatively inexpensive to achieve, and Option B is more cost-effective than Option D. (See the appendix in ASHRAE Guideline 14-2004, for estimating the cost of meters.)