What are the two types of ventilation systems that provide heat recovery?

The two types of ventilation systems that provide heat recovery are Heat Recovery Ventilation systems (HRVs) and Energy Recovery Ventilation systems (ERVs).

HRVs work by exchanging stale indoor air with fresh outdoor air while transferring heat from the outgoing air to the incoming air. This process helps to maintain a comfortable indoor temperature while reducing the energy required to heat or cool the space. It effectively preconditions the incoming air, making the heating and cooling systems more efficient.

On the other hand, ERVs not only transfer heat but also manage humidity. They work similarly to HRVs, exchanging indoor and outdoor air. However, ERVs can also transfer moisture between the air streams, which is particularly beneficial in areas with extreme humidity levels. This capability allows them to optimize indoor air quality and comfort while further enhancing energy efficiency.

Together, HRVs and ERVs play a crucial role in modern energy-efficient building designs by ensuring adequate ventilation without unnecessary energy loss, making them the correct choice in this context.