This paper focuses on the refined design of energy-saving technologies for building heating

ventilation and air conditioning (HVAC) under the dual-carbon background

taking the HVAC energy conservation of a school building in the hot-summer and cold-winter zone as the research case. Through a literature review

this paper systematically sorts out the current research status of the field. Aiming at the practical problem of high energy consumption of building HVAC systems

it puts forward strategies and approaches for refined design

covering the utilization of renewable energy

the optimization of heat pump technology application and other aspects. Meanwhile

this paper conducts an in-depth analysis of the challenges such as technical maturity

cost input and market promotion faced in the process of technology implementation

and proposes corresponding strategies and implementation suggestions

which aims to provide theoretical support and practical guidance for the innovation and application of energy-saving technologies in building HVAC systems.