Refrigerators made by Sub-Zero and Wolf are part of the Sub-Zero line, and 16 of Sub-Zero's refrigerator models are Energy Star certified, as of February 2015. Features that save energy include a fully insulated heavy gauge steel cabinet, magnetic door seals and dual refrigeration with two compressors.
The Consortium for Energy Efficiency groups Energy Star certified products into three tiers based on the product's efficiency in comparison to the Federal standard. Appliances that are at least 20 percent more efficient than the standard qualify for tier 1, appliances at least 25 percent more efficient qualify for tier 2 and those at least 30 percent more efficient qualify for tier 3. Sub-Zero has refrigerators that qualify for tiers 2 and 3.
Sub-Zero's Energy Star refrigerators come in all sizes, with storage capacities ranging from 4 to 23.5 cubic feet. The refrigerators are manufactured in the United States, and the company has used 75% recycled stainless steel in its products since 2012.
The company offers traditional, built-in and integrated refrigerators. Refrigerators come in multiple sizes and colors to accommodate different kitchen layouts. Available designs include a side-by-side refrigerator and freezer, a traditional refrigerator with a bottom drawer freezer, and a French door design with a bottom drawer freezer.