Changing climate intensifies heat stress, resulting in a greater risk of workplace productivity decline in timber office buildings with low internal thermal mass. The impact of climate change induced heat exposure on indoor workplace productivity in timber office buildings has not been extensively researched. Therefore, further investigation to reduce the work capacity decline towards the end of the century is needed. Here, heat exposure in a net zero-carbon timber building near Brussels, Belgium, was evaluated using a reproducible comparative approach with different internal thermal mass levels. The analysis indicated that strategies with increased thermal mass were more effective in limiting the effects of heat exposure on workplace productivity. The medium and high thermal mass strategies reduced workplace productivity loss to 0.1% in the current, 0.3% and 0.2% in the midfuture, and 4.9% and 3.9% for future scenarios. In comparison, baseline with low thermal mass yielded a decline of 2.3%, 3.3%, and 8.2%. The variation in maximum and minimum wet-bulb globe temperatures were also lower for medium and high thermal mass strategies than for low thermal mass baseline. The study findings lead to the formulation of design guidelines, identification of research gaps, and recommendations for future work.

气候变化加剧了热应激，导致内部热质量较低的木质办公楼工作场所生产力下降的风险更大。气候变化引起的热暴露对木质办公楼室内工作场所生产力的影响尚未得到广泛研究。因此，需要进一步研究以减少本世纪末工作能力的下降。在这里，使用具有不同内部热质量水平的可重复比较方法来评估比利时布鲁塞尔附近的净零碳木结构建筑的热暴露。分析表明，增加热质量的策略在限制热暴露对工作场所生产力的影响方面更有效。中热质量和高热质量策略将当前工作场所生产力损失降低至 0.1%，中未来分别降低至 0.3% 和 0.2%，未来情景分别降低至 4.9% 和 3.9%。相比之下，低热质量基线下降了 2.3%、3.3% 和 8.2%。中热质量和高热质量策略的最大和最小湿球球温度的变化也低于低热质量基线的变化。研究结果有助于制定设计指南、确定研究差距以及对未来工作的建议。