You can test your home for dust mites by purchasing an air quality monitoring device. This type of device will measure the levels of allergens and other particles in the air, including dust mites. Once you determine if there are high levels of dust mites present, you can take steps to reduce them and improve your overall indoor air quality. Additionally, you can also contact a professional to conduct an inspection of your home. This may involve using specialized equipment to check for dust mites, as well as other allergens and pollutants in the air.