HVAC - furnace replacement question - heat pump ?

I recently purchased a home in Brentwood. The house has gas furnace, which is probably 24 years old and a newer (2023) AC unit outdoor.
I'm thinking about replacing the furnace, spoke to a local HVAC company they said I need to get heat pump as I can't buy gas furnace anymore.
I have leased solar with 8kw system, 2350sqf house, does it make sense to get heat pump? also is it true that I can't buy gas furnace anymore ? I thought the ban is from 2030.