A solar-assisted egg incubator with a solar air heater, humidifier, and incubation components was developed and tested. The system was developed to provide efficient temperature and humidity control using solar energy. The incubator featured feedback control for temperature regulation through an induced draft fan at the outlet of the solar air heater. A relative humidity hygrometer sensor was included to manually control the humidifier setup. The solar air heater was designed with dual black paint-coated copper plates for double-pass airflow, an acrylic cover for greenhouse effect enhancement, and six convex lenses for concentration effects. The system successfully maintained an incubator temperature between 36.9 °C to 38.5 °C and a relative humidity of 60%–65%. The solar air heater achieved an average temperature rise of 4 °C with an average solar radiation of 403 W m −2 , a total heat gain of 48.3 W, and an efficiency of 77.5%. The setup was most effective for the first 18 days of incubation, while conventional incandescent lamp heating and humidification were recommended for the final three days. The developed solar-assisted incubator demonstrated effective temperature and humidity control using renewable energy. Future improvements, such as tracking mechanisms, full automation, solar photovoltaic integration, and multiple humidifiers, are recommended to enhance the system’s sustainability.