A heroic air conditioning engineer climbed down a building’s roof to save a boy trapped outside a fourth-floor window in eastern China.

Video filmed in the city of Linyi in Shandong Province on October 14 shows a boy, perching precariously on the outside of a fourth-floor window with his legs trembling and tears streaming down his face.

Two air conditioning engineers, Zhang Qingtao and Yang Xiaoqiang, who happened to be having a meal under the building, heard the cries for help and promptly abandoned their food to investigate the situation.

"The boy's condition was dire at that moment. He could only grasp the window with one hand, his slippers were clearly unsuitable for the situation, and he had only half a foot on the window ledge," explained Zhang Qingtao. Seeing this, he and his colleague, Yang Xiaoqiang, rushed back to their vehicle to retrieve some tools.

"We are both service engineers at Midea's after-sales service centre and our car's trunk always contains rope tools used for air conditioner installation and maintenance. We thought of using these tools to rescue the child," Zhang said.

Armed with the tools, the two men sprinted to the floor where the boy was trapped and ascended to the rooftop. With no visual on the child from the rooftop, their anxiety heightened. At this critical moment, Zhang said to his partner, "There's no time, skip the five-point harness, just tie a rope and go down."

Yang Xiaoqiang tied one end of the rope around his waist, firmly held the safety rope with both hands, and gradually let it out as Zhang Qingtao descended.

Zhang Qingtao seized the right moment, gripping the safety rope with one hand and grabbing the air conditioning unit of the fifth floor with the other. One foot was on the air conditioner on the fourth floor, while the other moved slowly toward the fifth-floor balcony. He yelled to Yang Xiaoqiang on the rooftop, "Let go!" and then proceeded to enter the room.

"Child, don't be afraid, Uncle is here to rescue you," were Zhang’s first reassuring words as he entered the room. He reached behind the young boy, using his arms to secure the child's armpits and stabilise his body, then gently lifted the boy from the window ledge and brought him safely inside.

Upon investigation, it was revealed that the boy was six years old, and his parents were away at work, leaving him home alone. Fortunately, thanks to the swift and heroic rescue efforts of Zhang Qingtao and Yang Xiaoqiang, the boy emerged from the ordeal unharmed.

The video was provided by local media with permission.

10月14日上午十一点半左右，山东临沂市兰山区一小区，一男童单手扒在五楼窗外，双腿打颤哭声连连，男童在高空嘶嚎的哭声引起了楼下居民注意。
大家发现男童处境不乐观：双腿止不住地打哆嗦，紧张、焦虑、惊恐，出现体力不支现象。因为没有救援工具。楼下居民开始给派出所、消防队、医院和网格员打电话求帮助
目击者江女士介绍，群众喊着不让孩子乱动让他抓紧，危急时刻，刚好楼下有两个按空调的男子张庆涛和杨晓强在吃饭，听到呼救后，他们放下手中碗，急忙跑出去查看情况。
“当时男孩情况就很不好了，只有一只手能抓住窗户，拖鞋明显不合脚，只有半只脚踩在窗沿上。”张庆涛介绍，看到这个场景，他和同事杨晓强赶忙回到车内寻找工具。“我和杨晓强都是临沂市兰山区美的售后服务中心的售后工程师，我们车辆的后备箱一直放有空调安装维修的绳索工具，当时就想利用这些工具去救援男孩。”张庆涛说。
拿起工具，二人往男孩被困楼层一路狂奔，爬到顶楼打开天台门，开始实施救援。
“我们在楼顶看不到孩子的情况，所以心里更加着急，这时张庆涛跟我说，没时间了，不穿五点式安全带了，只系一根安全绳下去。”杨晓强介绍，他想让搭档穿好安全系数更高的五点式安全带，张庆涛却大声回应道：“死不了，先救人！”
杨晓强将绳的一端捆在腰间，双手握紧安全绳，随着张庆涛向下攀爬，缓缓放出绳子。
张庆涛瞅准时机，一手拉住安全绳，另一只手抓好六楼空调外机，一只脚踩在五楼空调外机上，另一只脚缓缓移向五楼阳台，就这样一步一步地把重心移向阳台窗边，对着天台的杨晓强喊：“放绳！”，随后钻进室内。
“孩子别怕，叔叔来救你。”这是张庆涛进屋后说的第一句话。他赶到男童身后，用胳膊夹在男童腋下，固定住他的身体，用力将其抬起，将男童从窗外缓缓抱进房内。
经了解，男童六岁，他的父母工作外出，家中未有一人，所幸救援及时，男孩安全无碍。