1. Make sure to have a good sleeping bag that is suitable for colder temperatures.
2. Prepare for power outages. I believe in most countries there are official agencies providing advice for such a situation (e.g., in the case of Germany: Bundesamt für Bevölkerungsschutz und Katastrophenhilfe)
3. Maybe get a dehumidifier (for situations with reduced heating but still with electricity) in order to prevent mould with reduced temperature.