A humming unit that does not cool may have a failed capacitor, stuck motor, or compressor problem

https://localairconditioningservice981.readspirex.com/posts/24-7-hvac-repair-tips-for-sudden-cooling-failures-in-winter-haven

A humming unit that does not cool may have a failed capacitor, stuck motor, or compressor problem. Turn it off quickly to prevent damage and request repair.