A perfect integration of HOLTOP's traditional heat recovery technology and condensing heat recovery technology, featuring dual-heat recovery cores for dual-effect energy savings. It fully utilizes exhaust air energy to improve system operating conditions and enhance overall unit efficiency, with annual energy efficiency ratio consistently above 4.0. Equipped with Danfoss/Panasonic brand compressors for high efficiency, stable operation, and long service life. Refrigeration components such as expansion valves and liquid reservoirs also adopt well-known brands. Self-developed high-efficiency heat exchangers feature new high-efficiency internally grooved copper tubes with increased boundary layer disturbance, low resistance, and excellent heat transfer. Intelligent control functions include season-based intelligent compressor start/stop, system high-efficiency operation regulation, and equipment fault early warning and alarm, eliminating complex system adjustments. The addition of condensing heat recovery enables more precise and energy-efficient supply air temperature control, with a wide operating range for comfortable fresh air all year round.