As data center development draws closer scrutiny from local communities, a recurring question keeps coming up: do these facilities actually make their surrounding areas hotter? Recent research suggests the answer is yes, though the scale of the effect varies significantly depending on the study and the type of facility involved.
What the Research Found
One study focused on large-scale AI data centers found localized temperature increases of up to 16 degrees Fahrenheit (roughly 8 degrees Celsius) in the immediate vicinity of these facilities. It is not yet clear whether smaller, non-AI data centers produce a comparable effect.
A separate study examining facilities in the Phoenix area found a more modest overall increase, about 4 degrees Fahrenheit in ambient temperature around data centers. However, that same study found that air discharged directly from data center cooling systems could run as much as 25 degrees hotter than surrounding air. Together, the two studies point to a real but variable impact, one that depends heavily on facility scale, cooling method, and local climate.
Data Centers Are Not Alone
It is worth noting that data centers are far from the only contributors to localized heat. Office buildings generate similar effects. Dark-colored parked cars sitting in direct sun can raise ambient temperatures by nearly 7 degrees Fahrenheit. Paved surfaces in urban areas are also significant, well-documented sources of heat islands.
Possible Cooling Fixes, and Their Costs
Despite sharing the heat island problem with other structures, data centers are likely to face outsized scrutiny given growing local opposition to new projects. A few mitigation approaches exist, though none are simple or cheap.
- Moving away from evaporative cooling: This method releases significant heat into the surrounding environment through moisture-based heat extraction, making it a notable contributor to local warming.
- Liquid cooling: Circulating heated coolant through the ground or similar media generally reduces ambient temperature impact, but liquid cooling systems cost considerably more to install and operate than air-based alternatives.
- Discharging heat into water bodies: This can offload heat effectively, though it risks raising water temperatures and creating new ecological issues, an approach that may be more tolerable in warmer climates where aquatic life has already adapted to higher temperatures.
- Wider heat distribution: Spreading heated air or coolant over a broad area rather than concentrating it near the facility can reduce localized spikes, but doing so would require costly infrastructure spanning dozens of miles.
For now, most data center operators have limited practical options for reducing their local thermal footprint at reasonable cost. Where minimizing heat island effects becomes a priority, whether due to community pressure or environmental regulation, effective solutions exist. They simply carry a substantial price tag.