Make sure you have no leaks in your duct for your filter. I had a small cut around the base of one of my connections last year mid flower and couldnt find it as my room was full. Had to ride out the grow being smelly lol... I replaced all duct in one of my rooms and no more smell. I like using that duct thats coated with the black plastic as well as it is 2 layers and you dont have to worry about light leaks in it. Things can get reallllllyyyy smelly when the filters not working or you have leaks. Hope you get the AC fixed soon!