Beat this heat wave with cool air conditioning. We lab-tested popular window air conditioners to see which delivered the best cooling performance and value.

Laboratory Technical Project Manager Gianmarco Chumbe has been part of the CNET Home team since 2018. He is in charge of developing and carrying out testing procedures for a wide variety of home appliances and smart devices including robot vacuums, smoke/CO detectors and air conditioning units. He takes a data-driven and creative approach to every project he is involved in, honoring his background in Science and Engineering.

Jon covers artificial intelligence. He previously led CNET's home energy and utilities category, with a focus on energy-saving advice, thermostats, and heating and cooling. Jon has more than a decade of experience writing and reporting, including as a statehouse reporter in Columbus, Ohio, a crime reporter in Birmingham, Alabama, and as a mortgage and housing market editor for Time's former personal finance brand, NextAdvisor. When he's not asking people questions, he can usually be found half asleep trying to ...