Ventilation is a critical aspect of your home’s performance. Sometimes when we seal up a building to make it more energy efficient, we can make it unhealthy for the occupants. In older leaky homes, plenty of air from the outdoors inadvertently can make its way in through the cracks, so providing a dedicated supply of fresh air isn’t as much of a concern. Once all those leaks are sealed, it’s vital to replace that air source with a balanced ventilation system. One of the most common types of systems that provides us fresh air without compromising energy efficiency is the energy recovery ventilator (ERV). This device pulls in fresh air while exhausting old stale air. As a result, it recovers some of the heat that would normally be lost.