How to choose a portable air conditioner
Marketing BTU numbers are inflated. Here is what actually determines whether a unit will cool your room.
1. SACC, not ASHRAE BTU
The big number on the box (ASHRAE) overstates real cooling. The SACC/DOE figure is the honest one — a “14,000 BTU” unit is usually 10,000–12,000 SACC. Match SACC to your room size, not the headline number.
2. Single hose vs. dual hose
Single-hose units exhaust indoor air and pull warm air back in through gaps. Dual-hose (and hose-in-hose) designs cool faster and hold temperature better — worth the premium for rooms over 400 sq. ft.
3. Noise level
Compressors make noise; anything under 50 dB on low is livable, and inverter models reach 39–42 dB. For light sleepers, cool the room before bed and run fan-only overnight.
4. Drainage
Self-evaporating models rarely need draining in dry climates. In humid regions, check for a continuous drain option — otherwise you’ll empty the tank every few days.
Related rankings
On a tighter budget or in a dry climate? A cooling fan might be all you need — see our guide to the 10 best cooling fans, ranked by airflow, noise and value.
