Not a habitat for house dust mites

Allergy to house dust mites is a very common allergy. It is hypersensitivity to the droppings of dust mites, which get into the air we breathe when fabrics are shaken (e.g. bedding) or if there is a draught in the room. So it is not the mites themselves that trigger the allergy but the droppings they produce. House dust mites feed predominantly on flakes of human and animal skin and on moulds. Carpets, contrary to widespread opinion, are not a habitat for dust mites, as they do not provide the warm and humid climate and mites are not able to develop or survive on them.  

Allergie Medhost
Prodis - air quality in rooms
PDF Allergies

Dust mites need an ambient temperature of 20–30 °C and 65–80 per cent relative humidity. These conditions are chiefly found in textile materials like mattresses, cushions, bedding and in clothing, – so anywhere it is warm and moist. Keeping pets encourages breeding of house dust mites, because they provide the mites with additional food and moisture.