Find the right portable AC, sized by the honest BTU

Since 2017 the DOE requires a SACC rating (Seasonally Adjusted Cooling Capacity) that accounts for heat leaking back through the hose and window kit. Marketing still leads with the old ASHRAE figure. A "14,000 BTU" portable is honestly a 9,500-12,000 SACC machine — and our sizing, scores and wizard use only the honest number.

Conventional portables cycle a fixed-speed compressor: 53+ dB, on-off-on all night. Inverter models (Midea Duo, LG Dual Inverter, Whynter NEX) modulate continuously — measured in the low 40s dB and meaningfully cheaper to run. If the unit lives in a bedroom, the inverter premium pays for itself in sleep.

A single-hose unit exhausts indoor air outside, which pulls hot outdoor air in through every crack in the house — partially undoing its own work. Dual-hose (and hose-in-hose) designs feed the condenser with outdoor air instead. Under heavy sun or in big rooms, that architecture gap is bigger than a 2,000 BTU spec difference.