Late in the Fall we decided to start cleaning out the basement. We wanted get it done before the cold weather hit and have the space cleared out so that we could convert it into a guest room. We figured that it would be a good project for the long winter. We spend most of the winter indoors anyway because neither of us like the snow and cold anyway. As we started the project we started to notice something strange. While downstairs if always felt like I was light headed and within an hour or two I had to head upstairs to lay down. I never really made the connection until our HVAC technician showed up for our annual tune up. He came up and told us that there was a problem with the ductwork. He said that there was a large buildup of mold in the area in the basement and that there were small holes in it too. When he was telling us all of this it dawned on me that this may be the cause for my feeling poorly. I asked him if this was really a possibility and he said that the build up could be causing my headaches and ill feelings because the mold spores would be emitted out into the space each time the HVAC system came on. We arranged for the repairs to be done and have the entire ductwork system cleaned. After that I never experienced that feeling again when we were working in the basement. Now, we have a beautiful guest room that is safe for any of our guests to come and stay.