Home Smart by AE Mind
A portable AC needs a vent to cool a room, Technology Connections explains. With no vent at all, a misting fan like the Dreo TurboCool 765S is the alternative, and Paul Hibbert found it cooled him on a 33°C day while adding humidity. Options by venting situation.
Portable AC running cost: $1.52 to $2.20 for an 8-hour night across six models at full listed wattage and the July 2026 U.S. average rate of 18.31 cents per kWh, plus per-hour costs, other rates, a summer estimate and ways to cut the bill.
Single-hose portable ACs are about 25% less efficient because they exhaust air you already cooled, Technology Connections says, while dual-hose units cool the condenser with outside air. How each works, what a three-day energy test found, and when each type makes sense.
Dreo portable air conditioner review: the 12,000 BTU 515S and 8,000 BTU 318S compared on specs, setup, noise, drain-free operation, weight and running cost, with findings from Mike Review. Prices checked Oct 17, 2026.
The best portable air conditioners for renters, picked by situation: Dreo 318S for small bedrooms, Dreo 515S drain-free, Midea 14,000 BTU for living rooms, LG Dual Inverter for large rooms and BLACK+DECKER on a budget. Prices checked Oct 17, 2026.