Aiming at the problems of high temperature and high humidity in coal mining facing. this paper studies the heat distribution law of coal mining facing. compares and analyzes the enthalpy difference method and Sigma thermal difference method to calculate the air supply volume. Based on this. https://www.nacrack.com/flash-choice-Netgear-Nighthawk-LTE-Mobile-Hotspot-Router-Mobile-Hotspot-LTE-BRAND-NEW-p8608-best-super/