This high-end, portable air conditioner has a dual-hose design for efficient cooling. Pros: The dual-hose design effectively ...

(Some so-called ductless air conditioners are actually heat pumps ... is measured in British thermal units per hour (Btu/hr.) or in “tons.” One ton of cooling equals 12,000 Btu/hr.

The process of testing window air conditioners is identical to how we tested portable AC units. First, we heated a climate-controlled room to 92 degrees Fahrenheit. Then we turned off the heat and ...