|CHPS||EE1.0 Prereq.: 8 pts.;
EE1.1: up to 40 pts.
|GGlobes||3.3.1: up to 100 pts.|
|BDCv3||EAp2 Prereq.; EAc1: up to 24 pts.|
|NDv3||GIBp2 Prereq.; GIBc2: up to 2 pts.|
|BDCv4||EA Minimum / Optimize energy performance: Prereq.; up to 20 pts.|
|NDv4||GIB Minimum / Optimize building energy performance: Prereq.; up to 2 pts.|
Concrete masonry can harvest site energy using passive solar designs and decrease the size of HVAC systems. It has high thermal mass and specific heat, providing very effective thermal storage. The result is a beneficial lag between peak heating and cooling loads and outside temperature peaks, thereby delaying needed heating or cooling and lowering associated energy demand.
Interior walls act as heat-sinks to moderate indoor temperature swings, further reducing heating/cooling loads. Whole-building analysis programs capable of projecting a building's energy use and cost based on an hour-by-hour simulation can accurately model concrete masonry's thermal mass and predict associated savings.
The 2016 CEC recognizes the value of heavy mass walls (with concrete masonry units (CMU) in its definition); for most metro areas in Southern California, no insulation is required. Please see California Energy Code References, a quick reference guide to concrete masonry in the energy code.