There are multiple type of weather systems that can affect you adversely.
If your area suddenly experiences extreme heat you can suffer from heat exhaustion, but on the other hand, if you live in a region that experiences extremely cold winters,you can have a problem too.
My uncle plus uncle live up North plus they experience drastic ice storms that take down power lines, last winter season following one of these storms they were without power for almost a week plus 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 plus ended up slipping plus hurting her back. There are so multiple things that are dependent upon electricity in your Heating & A/C 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, then power surges plus moisture that may have accumulated can both disfigurement your Heating & A/C system beyond repair plus that would only cause you both a financial burden as well as the cleanup of the mess. Without the benefit of having Heat or a/c your help can be adversely affected so it is substantial to always plan for these type of situations, but having a backup generator is one way that you can ensure that your home plus your health will be safe plus your local Heating & A/C supplier normally can install those too.