I am no expert. Just a dog owner with a fearful dog. What works for me may be different for you and your dog. My experience with Nanuq is that any attempt to soothe or calm her when she is fearful only makes it worse. It's kind of like my giving her attention is a reward for the fearful behavior. If she calms down I can give her a pet or treat as a reward for the calm behavior. If Nanuq were afraid of the air conditioner I would just turn it on and ignore both her and the air conditioner. Send the message that it is no big deal. If she quit freaking out I would reward her like crazy for being calm. I think it would take a day or two but eventually she would figure out that the thing wasn't out to get her. I don't know if this would work for you. Every dog is different but it works for us.