Introducing the open source ventilation device 'OpenERV' that is warm in winter and cool in summer, and the design drawings and source code are public so you can repair it yourself

By installing a ventilation system compatible with heat recovery ventilation (HRV) or energy recovery ventilation (ERV) in a highly airtight house, you can create an ideal indoor environment that keeps warm air in in the winter and cool air in the summer. ' OpenERV ' is an ERV developed by Anthony Douglas, who lives in Canada, and can ventilate while recovering up to 90% of thermal energy. In addition, the design drawings and firmware source code are publicly available, so you can repair it yourself.

OpenERV

The 'WM12', which combines two TW4s, is OpenERV's main product. One TW4 is responsible for intake and the other for exhaust. TW4 can recover up to 90% of the thermal energy from the air passing through it, allowing ventilation while maintaining a constant room temperature.

Here's what the back side looks like. It seems you can change the settings via Wi-Fi.

When actually set up in a house, it looks like this. The normal noise level is 37dBA, and the maximum is 42.5dBA or less.

OpenERV is also characterized by its highly durable design that can be used for more than 50 years. In addition, since all of the design drawings, circuit diagrams, firmware source code, etc. are publicly available, you can repair it yourself if a malfunction occurs.

At the time of writing, the WM12 is in beta, priced at 600 Canadian dollars (about 65,000 yen), with production at a rate of one unit every two weeks. In addition, the price is expected to increase to 1,300 Canadian dollars (about 140,000 yen) after the official version is released.