Summer HRV Use Can Increase Electricity Costs Through Common Mistakes

Homeowners using heat recovery ventilators (HRVs) during summer may inadvertently increase their electricity bills due to improper settings, clogged filters, or excessive airflow, according to Eglė Afanasjeva, product manager at "Elektrum Lietuva." While many expect HRVs to cool homes like air conditioners, their primary function is air exchange, not active cooling. The system's impact on indoor temperature depends heavily on outdoor conditions, chosen settings, and maintenance.

Afanasjeva highlights the importance of the "bypass" function during warmer months. This mode is beneficial when outdoor air is cooler than indoor air, such as during the night or early morning. Engaging the bypass allows the HRV to supply fresh, unheated outdoor air, helping to maintain a more comfortable indoor climate. A common mistake is operating the HRV at a constant, high intensity throughout the day. During hot periods, this can lead to more warm air entering the home. Afanasjeva advises using a situational mode, reducing airflow during the hottest hours and increasing it during cooler evenings or nights.

Summer conditions, with increased pollen, dust, and airborne particles, pose a significant challenge to HRV filters. Regular maintenance and replacement are crucial for efficient operation, reducing wear, and preventing system failures. Clogged filters restrict airflow, degrade indoor air quality, and force the HRV to work harder, thus consuming more electricity. Maintaining clean filters ensures smoother system performance, proper air exchange, and prevents unnecessary strain on the fans, leading to more efficient energy use.

Although HRVs are not typically the largest energy consumers in a home, they operate continuously or for extended periods, classifying them as background appliances. Even small energy consumptions can add up over time, impacting the overall electricity bill. Manufacturers' specifications indicate that residential HRVs typically consume around 30-50W in normal mode and up to 80-100W in maximum mode. Continuous operation means these seemingly small amounts contribute significantly to energy usage.