What about air exchangers? What do they do? Why do we need one?

As the name implies, an air exchanger is a system that brings fresh air into the home and exchanges it for the stale inside. As part of the process, the air exchanger captures and retains the heat from the outgoing air to maintain energy efficiency. In older homes, fresh air came in through leaks in the construction. However, SIPs create such a tightly sealed structure, using an air exchanger is necessary to always ensure a healthy flow of freshly filtered, moisture-controlled air to the home's occupants.