This paper presents a preliminary comparative study of total energy density variations before and after twenty-five Homa (Fire Offering) ceremonies at a large esoteric Buddhist temple in Taiwan. The Homa ceremonies were personally presided over by an internationally renowned Dharma King, His Holiness Living Buddha Lian-sheng. The Homa ceremonies at this temple were held on Saturdays from 15:00 to 18:00 from May through November since May 8th, 2010. The study was based on field measurements of a total of twenty-five Homa ceremonies beginning May 5th, 2013. A high frequency electromagnetic wave test meter was employed to measure the electric-field strengths at fifteen specific measurement points located in the square in front of the main building of the temple. According to the field measurement results, it can be observed that the electric-field strengths at most measurement points exhibit certain regular variations, while at a few measurement points they exhibit an opposite characteristic.