Indeed, the core idea is to use a contra-flow heat exchange so that you can still have some ventilation. They are talking about 90% heat recovery. What the tech

Indeed, the core idea is to use a contra-flow heat exchange so that you can still have some ventilation. They are talking about 90% heat recovery. What the technology buys you is ten times as much air flow for a fixed heat supply. How do you want to use that? The article pushes the idea of small, stuffy house that uses the technology to push the heat requirement down towards what is given off by the occupants and their gadgets. More generally it lets you live in a better ventilated house in winter, because reduces the heating bills associated with air changes.