We sometimes forget that our homes are unfamiliar places to a newly adopted cat. There are new sights, sounds, and smells that may overwhelm some kitties. Margaret H. writes:
Margaret, your problem isn't uncommon, especially for new adoptions. Cats simply aren't prepared for a lot of the human things they experience in a new home. The more tentative a cat is to begin with, the more sensitive they are to unexpected sounds, sights, and smells. Sounds such as the one your furnace makes are sporadic and unpredictable, making them even more difficult to accept, but most cats will eventually come to accept them.
In most cases, it just takes time for a cat like Jack to become accustomed to the strange sound. As they hear it more and more frequently, they slowly come to realize that nothing bad happens to them after they hear it. There are a couple of things you can do to help speed along this acceptance.
First, you need to remain calm when Jack reacts to the sound. Nothing will reassure him more than your own casual acceptance of this horrifying noise. Don't even react to his reaction. Don't chase after him or even frown. If you choose to do anything, an offhanded statement of "It's okay - you're safe" will be enough. Then go back to whatever you were doing and allow Jack the time he needs to feel safe again. He has the hard work of realizing there's nothing to be afraid of. You need to allow him the time and space to do it. Just make sure you aren't adding to his stress. Give him an enclosed space in a place where he feels safe. That can be a place he retreats to and where you NEVER encroach upon him. Not even to pull him out to go to the vet. He needs to feel that he has a place where nothing can touch him, not even you. Then let him come out on his own.
If he faces the terrifying noise and chooses not to run away, or even not to run so far, reward him. One or two treats will help him to feel better about his courageous decision to face the horrifying noise.
Given enough time, Jack will probably learn to be less afraid of your furnace, but he may never shed the fear entirely. Allow him that. I know you want him to feel safe and happy in his new home. Rest assured, even with the noises, you're home may be the safest place he's ever been. He needs time and patience in order to learn how to feel safe again.
Wishing you and Jack all of the best!