WE PUT DOWN CERAMIC TILE IN OUR BASEMENT,AND WE HAVE BEEN NOTICING DUST COLLECTING IN CORNERS OF THE BASEMENT,AND UNDER THE FURNITURE.WE WOULD HAVE TO VACCUME EVERY DAY TO GET RID OF IT.WHAT WOULD BE CAUSEING THIS.OUR FURNACE IS DOWN STAIRS
FURNACE FILTER IS CHANGED ONCE A MONTH.PLEASE LET US KNOW WHAT THE PROBLEM CAN BE.THANK YOU