A number of Bay Area cities have adopted Reach Codes to reduce GHGs and meet climate protection goals. For new buildings, Reach Codes limit the use of natural gas (which releases GHGs) and require building electrification, solar system installation to support renewable energy, and electric vehicle (EV) infrastructure to meet growing EV charging demand. Natural gas usage in buildings is one of the largest sources of GHG emissions accounting for approximately 40% of all carbon emissions. Switching to a heat pump water heater can reduce household GHG emissions by up to 70% annually, and switching from a gas furnace to a high-efficiency air-source heat pump can reduce household GHG emissions by up to 54% annually.