site for the terminals on The brand new product (inside of a system with individual A/C and heating units there may be four leads to the back, two for each unit). AA batteries keep the settings if the facility at any time goes off.Picture: istockphoto.com A different helpful hack to conquer the heat is to cross-ventilate. This the original source allows control airflow through the entire home. It will involve shifting air throughout an area from one particular opening—generally windows or vents—to another to aid interesting and refresh the indoor surroundings.