Your questions about the best portable air conditioners answered What is the best portable air conditioner? The best portable air conditioner (and the quietest) is electriQ EcoPlus 10000 BTU smart portable AC with heater , thanks to its ultra-low running costs, sleep mode and genuine all-year usefulness. For bigger spaces, the electriQ EcoSilent 14000 BTU smart portable air conditioner stands out, delivering powerful cooling with impressively low energy use and excellent smart features. How much do air conditioners cost to run? Given the reactive nature of how we use air conditioners, it’s hard to put a weekly, monthly or annual cost on running one in your home. And in my day-to-day use, I found most models didn’t run at full power constantly anyway, especially when using auto or sleep modes, which helps keep running costs down.…