気候変動適応策としての空調の再評価：便益、制約、フィードバック効果

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🔬研究者:適応策と緩和策のフィードバックループを定量・統合的に扱う枠組みとして、冷却需要と電力システム研究の接点を提供する。

🏢実務担当者:空調依存の高まりが電力コスト・ピーク需要・冷媒規制リスクに与える影響を踏まえ、高効率化・パッシブ設計・再生可能電力調達を組み合わせた冷却戦略の検討材料となる。

🏛政策担当者:冷却アクセスの公平性と電力系統安定性を両立するため、効率基準・建築規制・冷媒規制・都市気候対策を統合した政策設計の必要性を示す。

Rising global temperatures and the increasing frequency and intensity of heatwaves have significantly amplified the need for effective thermal adaptation strategies. Air conditioning (AC) has emerged as the dominant technological solution to mitigate heat exposure, offering substantial benefits in terms of thermal comfort, health protection, and productivity. This paper provides a comprehensive and integrated assessment of the multifaceted impacts of air conditioning, encompassing energy, environmental, health, economic, social, and cultural dimensions. The analysis highlights that AC plays a critical role in reducing heat-related mortality and morbidity, improving cognitive performance, and sustaining economic productivity under high-temperature conditions. However, these benefits are accompanied by considerable challenges. The rapid growth of AC deployment drives substantial increases in electricity demand, particularly during peak periods, placing significant strain on power systems and contributing to grid instability and blackouts. Additionally, AC use exacerbates climate change through increased greenhouse gas emissions, waste heat release that intensifies urban heat islands, and environmental impacts associated with refrigerants, material extraction, and lifecycle processes. The paper also emphasizes profound inequalities in access to cooling, with low-income and vulnerable populations facing limited availability or affordability of air conditioning, leading to heightened exposure to thermal risks. Even where AC is available, economic constraints often restrict its use, resulting in insufficient protection during extreme heat events. Beyond technical and economic considerations, the widespread adoption of air conditioning has reshaped cultural norms, architectural practices, and human adaptive behaviour, fostering increased dependence on mechanically controlled indoor environments. The findings demonstrate that while air conditioning is an essential component of climate adaptation, it is insufficient as a standalone solution and may create reinforcing feedbacks that intensify energy demand and environmental stress. The study concludes that a transition toward integrated and sustainable cooling strategies is necessary, combining energy-efficient technologies, passive design measures, urban climate mitigation, and equitable policy frameworks. Such an approach is crucial to ensure resilient, low-carbon, and socially inclusive responses to rising thermal risks in a warming climate.

• openalex https://doi.org/10.1016/j.enbuild.2026.118246first seen 2026-09-16 04:43:58