What does HRV stand for?

The correct answer is "Heat recovery ventilator." HRV systems are designed to improve indoor air quality while conserving energy. They achieve this by exchanging stale indoor air with fresh outdoor air and recovering heat from the outgoing air, which is then used to preheat the incoming air during colder months. This process helps maintain comfortable indoor temperatures without significant energy loss, making HRVs particularly beneficial in climates that experience extreme temperatures.

Other concepts mentioned, like "High Recovery Ventilation," "Heat recovery valve," and "High Rate Ventilator," do not accurately reflect the standard terminology used in HVAC systems. While these terms might relate to ventilation and energy efficiency, they do not define the specific function and technology that an HRV represents in building ventilation systems.