Reduce HVAC Costs Up to 40% & Protect Your Home Year-Round  Winter: Prevents moisture buildup, reducing mold, rot, and insulation damage risks.Summer: Reduces attic temperatures by up to 40°F, lowering AC workload and energy bills. Built-in preset thermostat for automatic operation:This feature can be disabled for manual control.42W high-efficiency solar panel provides quiet, clean energy operation.Low noise level and no maintenance requiredSteel support parts guarrantee solid structures and aluminum alloy frame delivers lightweight and conveniencesHybrid solar + AC power ensures non-stop airflow 24/7.The fan features intelligent thermostat control to optimize energy efficiency and maintain ideal attic conditions automatically.The fan automatically activates when attic temperature reaches 77°F and stops when it cools to 73°F, maintaining optimal conditions without manual intervention.The LANGY 42W's hybrid power system ensures continuous operation regardless of weather conditions, providing year-round attic ventilation.Powered by high-efficiency solar panels using clean, renewable energy42W solar panel provides ample power for maximum airflowAutomatically switches to AC power when solar is insufficient or unavailable.The adapter is a great supplement for the solar supply. And they can work independently.The hybrid power system ensures your attic stays ventilated day and night, 365 days a year.Installation is intuitive and a breezeStep-by-step installation videoEverything includedWatertight design1-2 hours installation