There are many type of weather systems that can affect you adversely.
If your area suddenly experiences extreme heat you can suffer from heat exhaustion.
On the other hand, if you live in a region that experiences extremely cold winters,you can have a problem too. My aunt and uncle live up North and they experience severe ice storms that take down power lines. Last winter following one of these storms they were without power for almost a week and the problem was only made worse by the fact that there water tank burst in the basement. The basement floor was turned into an ice skating rink. When the power was restored, it was a bigger mess. My uncle went down to start cleaning up the mess and ended up slipping and hurting his back. There are so many things that are dependent upon electricity in your HVAC system is one of them. Whether you use a boiler system or a forced air system you need to be very careful during a power outage as well as when the power comes back on. Power surges and moisture that may have accumulated can both damage your HVAC system beyond repair and that would only cause you both a financial burden as well as the cleanup of the mess. Without the benefit of having Heat or air conditioning your help can be adversely affected so it is important to always plan for these type of situations. Having a backup generator is one way that you can ensure that your home and your health will be safe and your local HVAC dealer normally can install those too.