A new state law now requires all landlords who rent apartment units with heating systems or appliances powered by a fossil fuel to have carbon monoxide detectors installed in their rental property.  Units with fireplaces or an attached garage must also be in compliance with the new carbon monoxide statute. Fire Prevention Specialist with the Boone Fire Department Matthew Crawford said Carbon monoxide is a colorless and odorless gas and can kill you before you even know it's there. Crawford is urging all High Country residents to install both smoke detectors and carbon monoxide detectors in their homes.