"A large BTU number on paper meets the hard reality of single-hose AC physics."
14,000 BTU is the raw cooling power measurement (ASHRAE). As a single-hose unit, its effective cooling (SACC) is likely 30-40% lower because it exhausts conditioned air and pulls warm air back into the room.
This unit is for buyers prioritizing smart features like WiFi control at a sub-$400 price for a physically large unit. It can be a workable solution for moderately sized rooms (350-450 sq. ft.) in dry climates where maximum efficiency is not the primary concern.
Anyone trying to cool the full claimed 700 sq. ft. or living in a high-humidity region should look elsewhere. A dual-hose portable AC or a standard window unit will provide far more effective and efficient cooling for a similar cost or less.