Air Conditioning

Swimmers in an enclosed swimming area on the Seine River in Paris, France with a low arched bridge visible in background.

Paris is using Seine water to cool buildings

An underground network of pipes has been cooling public buildings since the 1990s.

July 11, 2026 - The Guardian

Man installing or repairing mini split air conditioning unit on white wall.

The Pacific Northwest is an unlikely front in the fight for cooling

A 2021 heat dome killed over 250 people in the Pacific Northwest, bringing into sharp focus the potential of extreme heat to have deadly consequences even in historically cool climates.

May 31, 2026 - Heatmap

Woman sitting in subway car holds up small portable fan to cool herself.

Temperatures in Subways Can Soar Well Above 100. What Some Cities are Doing About it.

Extreme heat can be even more dangerous in confined subway cars and stations.

October 31, 2025 - Wired

Manhattan brick apartments with AC units on windows.

NYC Lawmaker Proposes Mandatory Cooling Law

Despite hundreds of heat-related deaths every year, the city has no regulations on cooling in residential units.

August 5, 2024 - Word In Black

Close-up of white air conditioning window unit in window of brown brick building.

Thousands of NYC Shelter Residents Lack Air Conditioning

Even in the depths of extreme heat, many shelters prohibit residents from installing AC units.

July 18, 2024 - The New York Times

air conditioner unit on brick building wiht sunflowers.

Chicago Tenants’ Union Distributes AC Units to Low-Income Renters

The group wants to draw attention to the dangers of extreme heat and encourage tenants to organize to demand improved conditions.

July 16, 2024 - Next City

Extreme heat warning sign outdoors with red desert rock cliff in background.

California Faces Intense Heat Wave, Power Shutoffs

The state is bracing for a heat dome that will bring temperatures into the 120s and little nighttime relief.

July 2, 2024 - Los Angeles Times

View of city skyline in red smog indicating extreme heat.

The Heat Is On: Rising Temperatures Strain Urban Infrastructure

This summer is predicted to be one of the hottest on record, and heat waves will likely put physical and social infrastructure to the test.

June 28, 2024 - Diana Ionescu

Stone windcatcher tower that provides natural air flow in Shiraz, Iran

Looking to the Middle East for Cooling Architecture

Cooling mechanisms built into traditional architecture offer lessons for U.S. builders as heat waves grow more intense.

August 7, 2023 - Time Magazine

Window air conditioner units on a brick building

Oregon Law Requires Cooling, but Could Leave Many Renters Out

A state bill requiring landlords to allow tenants to install portable air conditioners comes with a raft of exemptions that could restrict the most affordable options.

July 27, 2022 - KPTV

Window air conditioner units on a brick building

Protecting Urban Residents From Extreme Heat

With temperatures reaching record highs in cities around the country, local officials are implementing measures to ensure vulnerable residents have adequate cooling.

July 24, 2022 - Next City

Hospital Signs

From Ventilators to Ventilation: The Shifting Focus of the Pandemic

Ventilator availability is a major indicator for states in the South and West that are seeing record hospitalizations, but in New York, where Gov. Cuomo announced that New York City had moved to Phase III of reopening, the topic was ventilation.

July 9, 2020 - Office of Governor Andrew M. Cuomo

Air Conditioner

The High Cost of Cool Air

Air conditioning has drastically changed modern life and the ways cities have developed. But, the environmental consequences are immense, and it’s time to cut back.

September 14, 2019 - The Guardian

Miami Temperature

A Guide to Cooling the House in Summer Heat

Christopher Ingraham does everyone a favor and produces a how-to guide for cooling your house "like a wonk."

July 17, 2016 - The Washington Post - Wonkblog

President Obama's Most Important Energy Efficiency Standard Unveiled

Just in time for winter, the U.S. Department of Energy released a standard to make heating and cooling in commercial buildings far more efficient, increasing minimum efficiency by 10 to 25 percent.

December 21, 2015 - The Washington Post

Study: Air Conditioning is Warming Phoenix

A study investigates the effect of air conditioning systems on air temperature and electricity demand. The study's findings: the release of waste heat (via AC systems) exacerbates the nocturnal urban heat island, thus increasing cooling demands.

July 23, 2014 - Treehugger

Celebrating the Anniversary of a Discovery That's Completely Changed the Built Environment

Following on the hottest ever first half of a year in America's recorded history, James Barron examines the history behind the creation of air conditioning, on this day in 1902.

July 17, 2012 - The New York Times

Cities Frown Upon Air Conditioned Sidewalks

As the Summer months heat up, Sarah Laskow reports on cities' efforts to keep retailers' doors closed.

June 3, 2012 - GOOD Magazine

Southern Cities that Built Around Cars are Now Building Towards Sustainability

Cities like Atlanta, that have grown up in the age of the automobile and air conditioning, are making efforts to green their environmentally unfriendly buildings and spaces, explains Emily Badger.

April 22, 2012 - The Atlantic Cities

Mongolia Constructs Glacier To Cool Capital

The Mongolian capital of Ulan Bator will begin construction this winter of an artificial glacier to cool the city next summer and provide melt water for drinking and irrigation.

November 21, 2011 - The Atlantic

FREE Course: Walkable City 1: Why Walkability?

After describing his path towards focusing on walkability as the essence of good planning, Jeff Speck marches through his five principal reasons for making more walkable places.

Reinventing Malls: Planning Alchemy—Turning Gray Fields Into Gold

The course focuses on the opportunities and imperatives that shape reinvention of mall sites.

Community Development Director

City of Wisconsin Rapids

Professor of Urban Planning

Harvard University Graduate School of Design

Transportation Planner I

KFH Group Inc.

Top Books

An annual review of books related to planning.

Top Schools

The definitive ranking of graduate planning programs.

100 Most Influential Urbanists

The who's who of urbanism, according to Planetizen readers.

Urban Planning Creators You Should Know

A short list of voices on social, video, and podcasting platforms.