It depends on the size of the generator and the installation. A small generator could cost a few thousand dollars, while a large one could cost tens of thousands of dollars. Installation costs will also vary depending on the complexity of the installation.

Unfortunately, there is no one-size-fits-all answer to this question. The cost of having a whole house generator installed will vary depending on the size and type of generator, as well as the specific installation requirements and location of the home. However, you can expect to pay anywhere from several thousand dollars to tens of thousands of dollars for a whole house generator installation.