The 2025 Code Readiness Annual Report summarizes progress in advancing data-driven research to support future energy codes and standards. The program strengthened its role as a bridge between research and regulation, aligning activities with California and national policy priorities. Key...

This project evaluates the energy efficiency (“EE”) and performance benefits of coil cleaning for ductless wall and floor mounted heat pumps, a routine maintenance practice that removes dust and debris from indoor and outdoor coils to maintain system performance. Unlike central heating,...

By shifting HVAC energy demand away from current and future grid peaks, TES can reduce strain on the grid without requiring that building occupant’s compromise their comfort. Long used to provide flexibility for domestic hot water applications, this Code Readiness study confirms the high market...

This project proposes a field demonstration of an emerging technology (“ET”) which is a commercial-ready technology that integrates networked lighting controls with heating, ventilation, and air conditioning (“HVAC”) systems. Using open-source protocols, the ET enables communication between...

The Berkeley Decarb Tool (the “Tool”) is an open-source web platform that helps users evaluate the energy and carbon performance of different heating, ventilation, and air-conditioning (“HVAC”) systems and equipment, and hosted by UC Berkeley’s Center for the Built Environment (“CBE”)...

Small food service businesses, such as corner stores and neighborhood bars/restaurants, depend heavily on small refrigeration systems to preserve perishable goods. These systems typically hold less than 50 pounds (“50-lbs”) of refrigerant and are currently unregulated by the state. Presently, many...

Retrofitting multifamily buildings with domestic hot water (“DHW”) recirculation systems to support efficient electrification, load shifting and demand response is challenging due to limited mechanical space, high upfront costs, and performance constraints.This project will validate the performance...

This report presents a field evaluation of flexible demand events with heat pump water heaters (HPWHs) operating in 10 occupied single‑family homes in the San Joaquin Valley. The study examined HPWH responses to California Energy Commission’s Title 24, Joint Appendix 13 defined “light shed” and...

The Code Readiness research team is conducting field monitoring studies on commercial hybrid HPWH systems installed in nonresidential buildings located in California. The intent of this research is to better understand energy performance of the commercial hybrid 120-gallon HPWH systems recently...

In 2024, PG&E’s Code Readiness Program research team initiated a research project for circulator pumps to identify and estimate energy savings and costs for different types of controls for circulator pumps in multifamily and non-residential buildings. The findings from this research will be...