Paragraphs Environmental Design

Cooling Degree Day Trends and Their Implications for Climate Responsive Housing Design in Selected Cities

A comparative critical synthesis of London, New York City, Athens, New Delhi, and Singapore

Review Article · Environmental Design · 2025, Volume 3, Issue 3: 1–20

DOI: 10.5281/zenodo.24159854

Ivan Stefan Saleff*

Lecturer, Daniels Faculty of Architecture, Landscape and Design, University of Toronto

*Correspondence: saleefry65@gmail.com

Received: June 2025 | Accepted: August 2025 | Published: September 2025

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Abstract

Increasing cooling degree days provide a useful warning that housing will face changing thermal demands, yet their design significance depends on the climate metric, the dwelling, and the household. This article develops a comparative critical synthesis of literature published before 1 December 2023 for London, New York City, Athens, New Delhi, and Singapore. It distinguishes observed degree-day trends, climate projections, monitored indoor conditions, and design inferences rather than treating these as interchangeable evidence. The analysis finds that cooling pressure cannot be translated directly into residential electricity demand or a uniform specification for housing. Common temperature thresholds improve climatic comparability but obscure differences in balance temperatures, humidity, solar exposure, ventilation, and adaptive opportunities. Similarly, annual totals conceal extreme episodes and night-time conditions that determine whether dwellings can discharge accumulated heat. The article proposes a four-stage interpretation linking climate exposure, building heat balance, available household responses, and performance verification. Applied comparatively, this framework supports seasonal flexibility in London and New York City, heat rejection and protection when nocturnal cooling is insufficient in Athens, seasonally differentiated strategies in New Delhi, and humidity-aware air movement and efficient cooling in Singapore. These priorities remain conditional on dwelling type, urban context, and affordability. The principal contribution is a testable design framework that uses cooling degree days for screening while requiring hourly thermal, moisture, and access assessments for consequential decisions. Climate-responsive housing should reduce unwanted heat gains, preserve viable passive operation, and provide efficient cooling where necessary, with performance judged by occupied conditions and resilience as well as annual energy consumption.

Keywords: cooling degree days; residential overheating; passive cooling; adaptive comfort; urban climate; climate adaptation

Citation

Saleff I. S. (2025). Cooling Degree Day Trends and Their Implications for Climate Responsive Housing Design in Selected Cities. Paragraphs Environmental Design, 3(3), 1–20. DOI: 10.5281/zenodo.24159854

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