Most RVs and DIY conversions can run a heater all night. Diesel, gas, and propane heaters don't use much electricity, and the fuel source is typically large enough to last multiple days.
Running an AC overnight is more challenging (read expensive) since it's fuel source is electricity. The cheapest way to accomplish this is using a gas generator. Investing $7k in a Li battery bank and a second alternator will accomplish the same thing.
Carefully consider whether this should be the defining characteristic of your vehicle. There are many vehicles better suited for living out of (part time or full time) than the limited space available in a Prius.