The renovation work on the cathedral, which began in August 1980 and continued for about two years, was completed in September 1982. (Omitted) As an environmental improvement measure, we installed an electric precipitator in the air conditioner to increase air cleaning power, and performed forced ventilation in each room to improve the indoor environment. Additionally, places where large numbers of believers gather, such as pews, are equipped with automatic temperature control devices to maintain a preset temperature. As mentioned above, various facilities were renovated to maximize efficiency with rationalization and energy conservation in mind. (“Kosei Yearbook 1983” P31)