Which is it you need in your home: a HRV (Heat Recovery Ventilator) or ERV (Energy Recovery Ventilator)? Most people do not realize that there is a difference. You need the correct one to have the proper impact in your home.
A Heat Recovery Ventilator (HRV) draws fresh air into a home over a core while exhausting the home’s stale air. It allows for the transfer of heat from the warm air (stale winter house air, or fresh outdoor summer air) to the cooler air. That is, it recovers heat that would have otherwise been exhausted making it quite efficient…however there is some energy loss in the process.
An Energy Recovery Ventilator (ERV) on the other hand does the same but it also allows for the transfer of moisture from the more humid stale winter air (or the fresh summer air) to the dryer air.
So, a Heat Recovery Ventilator (HRV) is better at reducing humidity in the home, while an Energy Recovery Ventilator (ERV) tends to retain humidity and is thought to be better suited for more air tight homes and or homes with little / no humidity issues.
Do your homework before installation so you have the right product for your needs.