Essential circuit generators are a cost-effective way to automatically back up the mission critical appliances in your home. They're light years better than portable generators. However, they can only energize 8-16 circuits in your electrical panel. This means you'll still have to pick and choose which circuits you wish to restore.
If 16 circuits just aren't enough, you can install a "smart circuit" generator instead. These new generators can actually power your entire home... if you limit your electricity consumption. The advanced technology of a smart circuit generator could allow you to run two central air conditioners because it manages the starting electrical loads.
The price of a whole house system can be prohibitive, but if you have the financial resources to power your whole home, go for it. Instead of settling for powering up a portion of your circuits, these liquid-cooled giants can light up your entire home and make your neighbors extremely envious.
