Core Insights - The article discusses the growth and trends in the building energy efficiency sector in China, highlighting the increasing energy-efficient building area and the investment trends in public, residential, and industrial buildings [1][4]. Group 1: Building Energy Efficiency Services - Building energy efficiency services include engineering services, software support, green prefabricated buildings, and BIPV (Building Integrated Photovoltaics) [1][2]. - Different building types require tailored energy-saving solutions, with public buildings focusing on systemic energy savings and residential buildings emphasizing comfort and cost balance [1]. Group 2: Energy-Efficient Building Area - As of 2020, China's energy-efficient building area reached 238.0 billion square meters, growing to 303.0 billion square meters by 2022, and further expanding to 326.8 billion square meters by 2023 [4]. - Projections indicate that by 2024, the energy-efficient building area could reach 360 billion square meters [4]. Group 3: Public Building Energy Consumption - Public buildings account for over 20% of national energy consumption, with hospitals, schools, and office buildings making up 38% of total building energy consumption [5]. - Investment in office buildings and commercial properties has been declining since 2018, with a projected investment of 416 billion yuan in 2024, reflecting a 9% year-on-year decrease [5]. Group 4: Residential Building Energy Efficiency - Residential energy efficiency focuses on insulation, natural lighting, renewable energy integration, and smart control technologies [8]. - The investment in residential buildings peaked and then declined, with 2023 investment dropping to 838.2 billion yuan and a further decrease to 760.4 billion yuan projected for 2024, a 10.5% decline [8]. Group 5: Industrial Building Energy Efficiency - Distributed photovoltaics are a significant application in industrial building energy efficiency, with cumulative installed capacity exceeding 100 million kilowatts by 2023 and projected to surpass 200 million kilowatts by 2024 [10][12].