###### Abstract
[PERSON] and colleagues discovered a positive correlation between the proportion of Trombe walls on the southern side of buildings and the indoor temperatures [2]. In their empirical study on ultra-low-energy buildings, [PERSON] et al. found that heating energy consumption was reduced by 80% compared to conventional buildings, while overall energy savings reached 50% [13]. [PERSON] and team identified an optimal retrofit strategy for residential buildings in London, achieving a 61% reduction in total energy consumption and an 85% decrease in thermal load [14]. [PERSON] and his research group concluded that optimizing the external walls or overall building enhancements during the winter can decrease heating requirements by more than 50% [15]. [PERSON] et al. reported a 13.65% reduction in energy consumption after installing 200 mm of expanded polystyrene insulation on building exteriors [16]. Using DesignBuilder software, [PERSON] focused on retrofitting the exterior and window structures of rural homes in Beijing, noting an approximate 60% savings in annual heating energy post-retrofit [17]. [PERSON] and collaborators demonstrated that incorporating Trombe walls and solar absorption coatings in cold regions can lead to a 40% savings in building energy consumption [18]. It is evident that factors such as building orientation, ventilation performance and air tightness, solar radiation gain, window-to-wall ratio (WWR), and window shading mutually influence the thermal performance and energy efficiency of buildings [19; 20]. Some scholars have focused on building energy-saving renovations that combine passive and active strategies, verifying the good applicability of solar energy systems in severely cold regions, which are economically advantageous and have significant energy-saving and emission-reduction effects [21; 22]. [PERSON] and others studied energy-saving renovations involving the addition of photovoltaic panels, EPDM membranes, and insulation layers to roofs, finding that such renovations could reduce energy consumption and enhance overall building performance [23]. [PERSON], A, and others demonstrated the cost-effectiveness of ground-source heat pumps in remote areas through simulations of these systems supported by a hybrid renewable energy-powered generation system using eQUEST [24]. [PERSON] and others optimized the architectural structure and insulation measures of rural houses through orthogonal experiments and designed a solar-assistedheating system for energy savings [25]. [PERSON] studied the addition of solar photovoltaic systems to passive rural house renovations, showing good economic benefits [26]. [PERSON] and others renovated rural houses under low-carbon and zero-carbon scenarios, indicating that both passive and active energy-saving renovations significantly improve the carbon emissions of rural houses [27]. Further, some scholars have analyzed the energy-saving renovations of buildings using actual measurement data, with practical results demonstrating significant energy-saving effects in renovated rural houses, as shown by [PERSON] and others comparing the heating energy consumption differences between solar active heating and traditional small coal-fired boilers [28]. [PERSON] proposed a new type of solar thermal storage floor radiant heating system for office buildings in Urumqi based on experimental setups [29], and [PERSON] tested the indoor thermal environment of rural houses before and after renovation, indicating a significant energy-saving effect post-renovation [30]. [PERSON]'s research identified the most effective energy-saving measures for energy-efficient buildings as improving the performance of air conditioning systems and enhancing the thermal performance of walls and windows [31]. [PERSON] proposed a comprehensive energy system based on Solar-Assisted Ground Source Heat Pump (SGSHP), achieving performance coefficients of 4.2 with solar collectors installed and 3.5 without [32].