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Church heating became generalised in the 20th century and caused significant damage to murals, painted woodwork, organs and other heritage objects, which had been preserved in good condition up to that moment in the historic churches. The article briefly summarises the relevant causes of the damages and deals with the churchgoers’ thermal convenience requirements. Then it presents the requirements regarding the heating of historic churches, the heating systems encountered in the country, their advantages but also drawbacks and finally details the results of the Friendly Heating European Research Project aimed at the optimal heating of historic churches (EVK4-CT-2001-00067).
The article highlights the need of proper environmental parameter monitoring of historic churches from the perspective of the suitable heating system selection, the assessment of its objective effects, as well as the early identification of the conditions that would damage murals, painted woodwork and heritage objects.
Keywords: historic churches, heating systems, thermal convenience, pew heating, Friendly Heating, damages, murals, painted woodwork, organ, heritage objects, temperature, relative humidity, environmental monitoring