Inspect your home regularly (monthly) to be sure no leaks have developed or moisture in gathering anywhere. Be sure to check under sinks, around fixtures, behind refrigerator. Also check the outside of your home: missing shingles, dirty/full gutters, plugged downspouts, missing siding, etc. Typically we keep our homes between 35%-50%RH. If you have mould issues in a basement, purchase humidity guage (garden store) and watch it to be sure the humidity in the basement stays below 60% (the threshold where hydrscopic (water loving) materials like paper, cardboard, wood, etc can pull sufficient moisture from the air to support surface mould growth.