AC heating isn't exactly cheap. I'm in Australia and it costs me around 300 aud a month in winter to keep the house around 21 about half of every day. I often wake up to a house that's between 4 and 10 degrees celcius. I have rooftop solar too. Heating in general is expensive.
Until gas prices went nuts it made way more sense to use gas for heating. We didn't even bother with AC prior because even when it hits 50C I'm cruising, a cold shower and a nap sets you right if you're used to it.