Strange noises coming from the Heating and A/C system are abnormal. Strange noises can indicate complications with the system! When noises get louder and louder, it’s best to call a professional for help, then i heard a couple of odd noises coming from the ductless mini split air conditioning… My wifey told me I was crazy, because she did not hear any noises. It seems like the odd sounds were only occurring during the afternoon, and for three mornings, I carefully listened for the noises. Every afternoon I heard the same, odd sounds. I finally decided to call the Heating and A/C service business in Lakeland, Florida, even though my wifey said it was a waste of currency. I called a dependable business with honest answers and affordable pricing. When the service professional looked at the ductless Heating and A/C system, he noticed a small piece of metal that was stuck inside of the machine, then he has to use a pair of pliers to unfasten the metal object, and the piece of metal must have been the source of the noise, because I haven’t heard any other sounds since the service professional came to look at the system. I showed the piece of metal to my wifey when she got cabin from toil later that afternoon. She was astonished to find out something was easily causing different and strange noises! Neither one of us could identify the object, but it was clearly the source of the noise. My buddy and I got a one year guarantee on the service service call, so if the noises do return I can call them to come back out free of charge.