As my mother’s only child, I try to make sure that I take care of her home as she gets older! My father passed away when I was growing up, so now my mom is living on her own; She is still capable, however I want to help her however I can… I observed that the furnace appeared to be operating differently! The fan on her furnace seemed to be blowing constantly. I wasn’t sure what caused the problem with it, though.. I checked the air filters as well as realized that it had been a long time since I had cleaned them for her. The filters were clogged as well as needed to be changed, but when I changed the filter, the problem persisted. I knew that there must have been some destruction done to the limit switch, which caused it to malfunction. This can happen as a result of leaving air filters clogged for too long… As much as I care about taking care of my mom’s home repairs on my own, I knew that I needed to call a heating and cooling professional. There is simply no safe way to upgrade a limit switch if you are not a certified Heating, Ventilation, as well as A/C professional. That’s why I called a local Heating, Ventilation, as well as A/C company as well as made an appointment. The company sent a Heating, Ventilation, as well as A/C worker over later that week. He was able to upgrade the limit switch for us. Now, I have to do a better task of changing the air filters so that there is no other issue.