As long as natural gas is used to generate electricity, bans on natural gas use in new residential construction result in reductions in CO2 emissions only if very high efficiency heat pumps are used and only if combined cycle rather than simple gas turbines are used for generation. All other uses of electricity actually increase emissions because of the heat losses in electricity generation. So why are localities in Blue America banning natural gas?
https://www.cato.org/blog/natural-gas-electricity-thermodynamics