My sister called me up and told me that her HVAC system wasn’t working very well. She said it hadn’t been working the best for months now but that it is getting worse. I don’t know why she was telling me this. I know almost nothing about HVAC units. I am a plumber, not an HVAC repairman. And yet, I am the one everyone in the family calls whenever they need any kind of home repair done. Because I was already coming over to my sister’s house for the holiday I told her I would take a look at her HVAC system anyway. The first thing I noticed was the fact that she had vent filters on every single vent in the house. I asked why and she said that a lot of dust comes out of them. I removed one of the vents and the filter was full of dust. In fact, as far as I could see, the entire duct was full of dust. No wonder she wasn’t getting any heated air if all of the vent filters were so dusty. Additionally, the ductwork shouldn’t be this dirty either. I told her as much. I highly recommended she get a ductwork cleaning done ASAP. Then she would be able to discard the vent filters and I bet her whole HVAC unit would work a lot better. She kept insisting that I should do this for her. I had to remind her that I’m not an HVAC professional. I don’t even have the tools, or the knowhow, to do a ductwork cleaning.