Typically, 13 SEER is the minimum level of central air conditioner efficiency sold in Canada but the government may soon raise this limit to force the sale of even more efficient A/C systems. In order to qualify for ENERGY STAR  certification the central air conditioner must usually be at least 14 SEER or greater, though not ALL 14 SEER A/Cs are automatically rated.When you purchase an ENERGY STAR-certified high-efficiency central air conditioner you can rest assured that you are purchasing a model that has met certain energy use specifications, and should expect to see a greater percentage of energy savings each month.For most Canadians, 14 SEER is a good place to start, or if you can afford slightly more, we recommend investing in at least a 16 SEER air conditioner. Beyond 18 SEER probably isn’t necessary for most ordinary home owners and consumers in Canada.The manufacturer brands of central air conditioners available in Canada offer a wide range of models from 13 SEER all the way up to 26 SEER. That being said, models with SEER ratings above 18 are rarely sold in Canada to ordinary consumers and are usually meant more for warmer climates like the southern United States.