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When it comes to energy innovations, the Swedes have a reputation for taking the lead and showing us the way. Now they are at it again—this time with the exhaust-air heat pump. This new system is making an important contribution to ventilation technology in Sweden, particularly in areas of more moderate climate. (In colder regions, similar to New England, the air-to-air heat exchanger still reigns supreme.) Although the exhaust pump has yet to hit the stands in the U.S., one model is now available in Canada and is expected to reach the U.S. market in the near future. How it Works Despite its more complex technology, the exhaust pump has distinct advantages over the heat exchanger. Here's how