Check the drainage and ventilation system
Many homeowners design houses that are not large enough so there are no windows, small windows, or no ventilation. So at the time the weather changes, the house is a humid place, with many unpleasant odors that need to be released, and need to be ventilated to keep everything dry and clean. From there, it can be seen that without this system you will always feel an odor when exposed during daily activities. To eliminate odors and mold, you should combine artificial and natural ventilation sources.
You should always check and clean ductwork at least once a year to prevent blockages or leaks that allow moisture to enter your home. Since mold spores are everywhere, even in dry climates, it is possible to form black mold or other harmful molds in your home. You may find that annual inspections and cleaning are extremely important.