The data source is based on occupied housing units, not residents: https://data.census.gov/cedsci/table?t=Heating%20and%20Air%20Conditioning%20%28HVAC%29&g=0100

The data source is based on occupied housing units, not residents: https://data.census.gov/cedsci/table?t=Heating%20and%20Air%20Conditioning%20%28HVAC%29&g=0100000US%240400000&y=2020&tid=ACSDT5Y2020.B25040&tp=true https://data.census.gov/cedsci/table?t=Heating%20and%20Air%2... This may skew the stats if units without gas tend to be smaller (and need less heating), e.g. if it's predominantly condos that lack gas heating. According to that same data source 27% of California's occupied housing units are heated with electricity. That is much higher than I would have expected.