| Summary: | This article presents an original study on the impact of climate change and the area of windows <i>A<sub>wi</sub></i> (factor <i>X</i><sub>1</sub>), the thermal transmittance coefficient of windows <i>U<sub>wi</sub></i> (factor <i>X</i><sub>2</sub>), and the coefficient of total solar transmittance factor of the glazing <i>g<sub>gl</sub></i> (factor <i>X</i><sub>3</sub>) on the index of annual usable energy demand for heating <i>EU<sub>H</sub></i> (function Y) of a single-family residential building in the climatic conditions of Bialystok (Poland), which were loaded with an equal gradual increase in average monthly external temperature by Δ<i>θ<sub>e</sub></i><sub>,<i>n</i></sub> (factor <i>X</i><sub>4</sub>). Based on the results of the computational experiment, a deterministic mathematical model of this dependence was developed, and the effects of selected factors on the <i>Y</i> function were analyzed for the considered climatic conditions. Moreover, in cases of selected variants, the influence of the energy source on the amount of final energy used and CO<sub>2</sub> emissions was studied. It was found that an increase in the average monthly external temperature reduces the <i>EU<sub>H</sub></i> of the tested building by 8.4% per every 1 °C of increase in Δ<i>θ<sub>e</sub></i><sub>,<i>n</i></sub>. The reduction in CO<sub>2</sub> emissions as a result of climate change is visible for systems with low efficiency and high emission factors (wood boiler), while in the case of pro-ecological high-efficiency systems (with a ground-source pump heat) it is inappreciable. Due to the need to decarbonize buildings, knowledge about the impact of the properties of windows, which are the weakest element in terms of heat loss through the building envelope, as well as the type of heat source on heat demand and CO<sub>2</sub> emissions, is very important for engineers and designers when making the correct decisions.
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