A Heat Recovery Ventilation system, or HRV system, is an energy recovery ventilation system that functions by using a combination of three devices: a heat recovery ventilator, air exchanger and heat exchanger. Sometimes an air-to-air heat exchanger is used in place of an air exchanger to control air flow between the inside and outside.
HRV systems produce fresh air in an enclosed indoor environment to produce and increase the overall quality of the air due to improved circulation. HRV systems also reduce heating and cooling requirements for a home or business. The result is lower costs associated with the cooling or heating process. Energy recovery ventilators are closely related to HRVs, but they also transfer the humidity level of the exhaust air to the intake air and remove excess moisture that causes water to build up on your homes windows
The effort to improve the energy efficiency of a home or building usually means better insulation and weatherstripping. Homes and buildings are becoming more airtight than they once were. This is a plus when it comes to conserving energy. However, a trade-off for having an airtight house or building is reduced air circulation. All homes and buildings must have a source of fresh air. This is where an HRV system becomes necessary.
Opening a window is only practical to a certain point. In the summer, an open window brings in humidity. In the winter, heat escapes if a window is opened. Additionally, many climate-controlled buildings have windows that do not open at all. HRVs offer a practical solution to this problem. Fresh air is provided along with better climate control while maintaining energy efficiency.