"A suspiciously cheap 14,000 BTU unit whose performance claims defy physics and price."
The 14,000 BTU rating is a lab measurement. In your home, this single-hose unit will realistically struggle to cool a well-insulated 400 sq. ft. room, not the 750 sq. ft. advertised.
This unit is for someone on an absolute minimum budget needing temporary relief in a small bedroom or office (under 400 sq. ft.). They must be willing to accept the significant risk of a short lifespan and overstated performance.
Anyone needing to cool a room larger than a small bedroom, who values quiet operation, or expects an appliance to last more than a season or two should invest in a unit from an established brand with a published SACC rating.