Major building envelope and duct leakage issues can occur during manufactured home production, transport, or setup; these leakage issues frequently will increase energy usage significantly and are a long-term barrier to efficient building electrification. Identifying and fixing building envelope...

The objective of this project is to support the development of a new central heat pump water heater (“HPWH”) measure package, to enable central HPWH projects where the baseline water heating system is electric (including electric resistance storage) or code minimum electric and HPWH baselines in...

This project will evaluate barriers and opportunities for accelerating the adoption of and improving energy savings associated with central heat pump water heaters (“CHPWH”) in multifamily buildings. CHPWHs typically consist of one (1) or more heat pump water heaters, hot water storage tanks, a...

Southern California Edison’s Codes & Standards Planning and Coordination (P&C) program presents their 2025 achievements and progress on key initiatives. The P&C program’s focus areas are energy-efficient building decarbonization, grid harmonization, and code harmonization. The P&C...

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 in multifamily and non-residential buildings. The findings from this research will be used to guide...

California’s 2025 Title 24 standards advance state goals for energy efficiency, electrification, and grid readiness. However, current compliance software does not always fully reflect the benefits of core Passive House (PH) strategies. This study develops a modeling crosswalk between the Passive...

Residential Multi-Function Heat Pumps (“MFHP”) provide space cooling, space heating, and hot water heating using one (1) compressor, with potential for lower maximum power consumption to avoid retrofit electrical service upgrades. MFHP products have the potential to save energy and reduce...

This is the first project report for the Code Readiness Data Center Energy Efficiency project, which aims to identify, prioritize, and support the adoption of updates to Title 24, Part 6, Title 20, ASHRAE (Standard 90.4), and other applicable regulations. This report includes findings from a...

Central heat pump water heater (“CHPWH”) systems are an emerging technology (or “Technology”) that can supply efficient, electrified domestic hot water to multifamily and commercial buildings with load-shifting capabilities. Standard designs rely on bulky, pressurized hot water storage tanks with...

This study was conducted to address 1) data gaps about how large split CHPWH’s installed in existing multifamily buildings operate in an RtP configuration compared to the industry standard configuration of returning recirculation water to the systems swing tank (RtS) and 2) better understand how to...