I run into this too. Solutions might include more battery capacity (and power to recharge), live with a lower ambient temperature (I've slept in a tent below freezing, many cultures still use 40-50 F at night, or all day in winter), of relocate to someplace warmer.
At my age now, I am accustomed to a warmer living space, so. if it is cold enough outside, I'll pay for a power hookup. Even if Ihad more battery capacity, without power they won't get recharged for the next night. Full charge needs 8-12 hours, not going to get that driving or running a genset for a couple hours.
