The Climate Action and Sustainability Committee of Palo Alto convened on September 5, 2025, to discuss key amendments to local ordinances regarding heating and cooling systems in residential properties, particularly focusing on accessory dwelling units (ADUs). The meeting featured public comments and staff responses on proposed changes aimed at enhancing energy efficiency and sustainability.

The first significant topic addressed was the suggestion to include an exemption for homes equipped with combination heat pumps that provide both hot water and home heating. A speaker emphasized the need for clarity in permitting processes, advocating for a straightforward exemption that would allow these homes to add air conditioning units without undergoing extensive permitting hurdles. This proposal aims to streamline the process for homeowners who already have heating solutions in place.

Following this, Peter Waltick presented a case for allowing electric resistance water heating in all ADUs. He highlighted the advantages of electric resistance heaters, including their affordability, ease of installation, and efficiency, particularly in smaller living spaces. Waltick argued that since Palo Alto sources its electricity from renewable resources, the use of electric resistance water heaters would not contribute to the city's carbon footprint. He urged the committee to amend local ordinances to permit these systems for all ADU sizes, noting that the current California Energy Code only allows them for structures under 500 square feet.

Dashiell Leeds, representing the Sierra Club Loma Prieta chapter, expressed support for the proposed ordinance amendments, particularly the inclusion of air conditioning to heat pump language. He pointed out that heat pumps are significantly more efficient than traditional heating and cooling systems and can help reduce emissions while improving indoor air quality. Leeds encouraged the committee to act swiftly to recommend the adoption of these changes to the city council, aligning Palo Alto with other progressive cities in the region.

In response to public comments, city staff acknowledged the suggestions regarding exemptions and electric resistance heating. They noted the complexities involved in energy code compliance for electric resistance systems but expressed a willingness to explore potential solutions. Staff indicated that further discussions would be necessary to assess the feasibility of these proposals before the ordinance becomes effective on January 1, 2027.

The meeting concluded with a commitment to consider the feedback received and to continue refining the proposed amendments to support sustainable practices in Palo Alto's residential developments. The committee's next steps will involve further analysis of the suggestions and preparation for a recommendation to the city council.