Whenever I do something noisy like use the vacuum or blender, I yell across the house “I’m going to make some noise now, ready? Here it comes!” And then turn on the thing.

As a result, they usually don’t even leave the room if they are in with me. They don't get freaked out, and just go to the top of a tree and watch.

Have done so for decades with about a dozen cats and it has worked with all of them so far. I also give warning when I’m going to turn on the light, because it’s polite to not blind anyone, animal or human.