TL;DR
A new study from Arizona State University confirms that data centers in Phoenix can elevate local air temperatures by up to 4°F downwind. This thermal impact extends up to a third of a mile and may influence urban heat and health risks.
Arizona State University researchers have confirmed that data centers in Phoenix can raise ambient air temperatures in nearby neighborhoods by up to 4 degrees Fahrenheit, based on direct, real-time measurements. This finding highlights a previously underrecognized source of urban heat that could affect public health and city planning.
The study, published in the Journal of Engineering for Sustainable Buildings and Cities, involved mounting high-accuracy temperature sensors on vehicles to measure temperature differences around four Phoenix-area data centers. These facilities ranged from 36 MW to 169 MW and used primarily air-based cooling systems. The measurements showed average temperature increases of 1.3 to 1.6°F downwind, with peaks reaching 4°F, detectable up to about a third of a mile from the centers.
Lead researcher David Sailor explained that the waste heat from data centers, which can exceed the heat output of 40,000 households, creates thermal plumes that move downwind, raising local air temperatures and potentially intensifying urban heat island effects. The impact was consistent across different atmospheric conditions, though further studies are planned to explore a broader range of weather scenarios and to develop models for mitigation strategies.
Why It Matters
This discovery matters because even a small increase in local temperature can exacerbate heat-related health risks, especially during extreme heat events. Elevated temperatures drive higher air conditioning use, which in turn adds more heat to the environment, creating a feedback loop. As data centers expand—projected to more than double in capacity by 2030—these localized heat impacts could become more widespread, making it a critical issue for city planners and policymakers.
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Background
Previous research relied mainly on satellite data to estimate the heat impact of data centers, which provided indirect and less precise assessments. This study is the first to directly measure real-time temperature effects downwind of operational data centers in an urban setting. The Phoenix area, already vulnerable to extreme heat, offers a relevant case study as the number of data centers grows rapidly to support cloud computing and digital infrastructure needs.
“Even if these data centers only contribute to an additional heat island of one or two degrees, that can still have a very significant impact on our lives.”
— David Sailor
“This is the first direct measurement of the real-time thermal impact of data centers on neighborhood air temperatures.”
— Soroush Samareh Abolhassani
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What Remains Unclear
It remains unclear how different atmospheric conditions, such as wind speed and humidity, influence the magnitude and extent of temperature increases. The long-term cumulative impact of multiple data centers operating simultaneously across the city is also still being studied, as well as effective mitigation strategies.
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What’s Next
Researchers plan to expand their measurement efforts across more locations and weather conditions to develop comprehensive models. City officials and industry stakeholders are expected to collaborate on designing cooling solutions and siting policies to minimize thermal impacts, especially as data center capacity continues to grow.
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Key Questions
How do data centers cause local temperature increases?
Data centers generate significant heat from their servers and cooling systems, which is released into the environment, creating thermal plumes that raise air temperatures downwind.
What is the extent of the temperature increase caused by data centers?
Measurements in Phoenix show average increases of about 1.3 to 1.6°F, with peaks reaching 4°F within roughly a third of a mile from the centers.
Why is this temperature increase a concern?
Even small temperature rises can worsen urban heat island effects, increase cooling demands, and elevate health risks during heatwaves.
Are all data centers contributing equally to this issue?
Impact varies based on size, cooling methods, and atmospheric conditions, but all large air-cooled data centers can produce measurable thermal plumes.
