An HRV (Heat Recovery Ventilator) is designed to provide fresh air and improve indoor air quality while recovering heat from the exhaust air in your home. Although it is generally beneficial to have your HRV running consistently, there are specific situations where you might consider turning it off temporarily: Extremely cold outdoor temperatures: During periods of extreme cold, the HRV may struggle to defrost, leading to ice buildup in the unit. This can reduce efficiency and airflow. In such cases, you may want to turn off your HRV temporarily to prevent damage and maintain your home's comfort. High outdoor humidity levels: If the outdoor humidity is very high, running the HRV may draw moist air into your home, potentially increasing indoor humidity levels. In this situation, you might want to turn off your HRV to maintain optimal indoor humidity levels. Planned or extended absence: If you're planning to be away from home for an extended period, you may want to turn off your HRV to save energy. Maintenance or repair: It's essential to turn off your HRV during maintenance, cleaning, or repair tasks to ensure safety and proper functioning. Remember that these situations are exceptions, and it's generally best to keep your HRV running to maintain good indoor air quality and energy efficiency. If you're unsure whether to turn off your HRV or need assistance with maintenance or repairs, contact Martino HVAC. Our technicians can help you make the best decision for your home's comfort and air quality needs.