Abstract
This paper examines the characteristics of creating an optimal microclimate in the operating conditions of an unheated historical building – the mausoleum of Khoja Ahmed Yassawi, a UNESCO World Heritage Site. Comprehensive monitoring of temperature and humidity parameters in key areas of the building was carried out, and critical periods and conditions contributing to moisture condensation and degradation of finishing materials were identified. Particular attention was paid to the preservation of plaster decorations, which are vulnerable to moisture accumulation, salt crystallisation and temperature fluctuations. Based on the data obtained, engineering, technical and organisational measures were proposed to stabilise the microclimate, including the development of online monitoring systems, controlled ventilation, local dehumidification and air heating, taking into account the authenticity of the monument and the climatic characteristics of Southern Kazakhstan. The results obtained are of practical importance for the development of universal approaches to the preservation of unheated architectural objects in a sharply continental climate and can be used in the formation of regulatory requirements in the field of microclimatic safety of monuments.