Energy efficiency is measured by a SEER, or Seasonal Energy Efficiency Rating. The higher the SEER, the more efficient the central air conditioner, and the lower your electric bill.

Portable AC units are not the cheapest or most energy-efficient way to cool down a room. We know this, but we also know this ...

You probably would, and this is what ductless mini-split HVAC systems offer, in addition to very effective cooling in the ...

Here's how to tell whether to go with a window a/c, portable unit, a ductless mini-spit, an evaporative cooler—or a combo of several.

Best AC Units at Amazon No. 1 Best-Seller: Frigidaire 5,000 BTU Window Air Conditioner, $169 (orig. $179) Similar U-Shaped Design: R.W.Flame U-Shaped Window Air Conditioner, $320 Lowest Price: LG ...