Have you tried a gym fan? I have upgraded to this one: Oypla Electrical 18" Chrome 3... https://www.amazon.co.uk/dp/B00HU3BF22?ref=ppx_pop_mob_ap_share Sorry for the Amazon UK link this seems the US equivalent of the previous one: https://www.amazon.com/gp/aw/d/B004IS6JBY/ref=cm_cr_othr_mb_bdcrb_top Alternatively search Amazon for “gym fan”.
We’ll reviewed lasko that I have is cheaper. Obviously I can’t compare it to the air king bc I don’t have it but I’m in Florida and it’s good for me.
Lasko 20" High Velocity Quick Mount, Easily Converts from a Floor Wall Fan, 7 x 22 x 22 inches, Black 2264QM https://www.amazon.com/dp/B004IS6JBY/ref=cm_sw_r_cp_api_glt_i_SPBGYAKKCEP9HTYRJXHF?_encoding=UTF8&psc=1
The longer the fan blades, the better the air flow. The window fan with 2 motors is like twice the length of each blade for a single fan motor. For best cooling, I'd also get a large floor fan for inside circulation, in addition to a window fan for pulling air into your apartment. Do not get those 'vornado' 'turbo' fans, what they do is funnel the airflow into a stream, so you get convection cooling at where you point the fan only, but the rest stays hot. A good fan will move cubic feet of air, no matter how slow the fan blades spin. Get a commercial grade fan with metal blades, pay big once, last forever, not with plastic blades.
https://www.amazon.com/Lasko-2264QM-Velocity-QuickMount-Black/dp/B004IS6JBY?ref_=ast_sto_dp&th=1
I would buy the fan at a commercial supply house, or Home Depot or Lowes, made for contractor use, not 'home' use, it will last a lifetime.