No inside ducting needed for air circulation. Windows vent cross breeze in summer. Heat exchanger used to bring in fresh air with minimal thermal energy loss. Heats or cools exterior air brought inside. Most effective in extreme hot or cold climates.
Solar panels convert sunlight to electricity.
Used to store power in batteries or use 12v lighting or pumps directly. Supplies 120vac or 240vac with inverters. Provides back-up power, and protection against brownouts. Wind generator typically interfaces with solar power systems for increased power demand. Also functions as a stand alone power generator.