There are normal signs of wear and tear on the Heating and A/C unit, however occasionally the machine will start to make a odd sound, but that sound is often the honestly first alert that something is wrong with the Heating and A/C unit. There are a number of problems that can cause the machine to make different sounds and many of the problems can be fixed easily, some of those troubles may require a licensed Heating and A/C professionalâ€¦ Having a top rated professional check on the issue is always the best idea, but my wifey and I were having some trouble with the gas furnace and the people I was with and I started hearing a odd sound. The odd and strange noise persisted for 3 mornings before the people I was with and I decided to call a professional, then neither 1 of us recognized the noise coming from the heating machine, so the people I was with and I decided to call a licensed and reputable supplier in the valley! All of us ended up having an appointment on the same afternoon and the people I was with and I found out that the sound was coming from the gas furnace. All of us were lucky that the issue was not severe, and the repair did not cost a lot of currency. The gas furnace repair professional told our wifey and I that the people I was with and I absolutely did the right thing when the people I was with and I called the repair dealer. The guy advocated that it was always a wonderful plan to call an expert when the machine starts making a odd and weird sound. That is the same advice for the gas furnace or the air conditioner. The signs of wear and tear can be strange stinks or sounds and they are absolutely the way that the machine alerts us when there is a problem.