Choyatsira magetsi chobweza magetsi chosabwerera m'masika (chomwe chimatchedwanso "chobwerera m'masika chosabwerera" kapena "choyatsira magetsi choyendetsedwa ndi injini") ndi chipangizo chomwe chimagwiritsidwa ntchito mu machitidwe a HVAC kuti chiwongolere malo a zoyatsira magetsi (ma plates olamulira mpweya) popanda makina omangira masika. Mosiyana ndi zoyatsira magetsi zobweza magetsi, zomwe zimadalira kasupe kuti zibwerere pamalo ake (monga kutsekedwa) magetsi akatayika, zoyatsira magetsi zosabwerera m'masika zimakhala pamalo awo omaliza magetsi akadulidwa.