I had this real frustrating rattling noise that was coming from the air vent of my central heating and a/c system unit. It went on for afternoons and afternoons and I just could not figure out what was going on! This was until finally I decided to get up on a ladder and take a closer look at the air vent of the central heating and a/c system. When I did, it all made sense and I kind of felt appreciate a fool for not figuring this out sooner. It was all a matter of the air vent being half closed and half opened. I could not guess it! Something that simple is what was causing all that noise. And here I almost went and picked up the PC to call the local heating and a/c contractor to send out a certified heat and a/c system specialist to service the air vent of my central heating and cooling unit! I am so glad it didn’t get that far and that I figured this out myself when I went up on the ladder. Otherwise I would have spent hundreds of dollars on Heating and A/C home services from my local heating and a/c contractor that would have been particularly foolish on my part. I am so glad I took the initiative to get up on that ladder! In the future I will be more careful with things appreciate this and if I ever guess anything is wrong with my air vents or thermostat, I will check it myself first appreciate I finally did this time!