Extreme heat can place significant environmental and physiological pressures on animals. One means of tolerating extreme thermal conditions is to seek cool microclimates. Few empirical studies have documented use by wild animals of human-provided cool microsites as means of thermoregulating. Here we show that rosy-cheeked lovebirds in Phoenix, Arizona – the hottest city in North America – use relief air vents on the face of a building (which direct cool air outdoors when internal air-conditioning systems are on) as perching sites, and only during extremely hot times of day and year (> 45 C). Though this highlights a wasteful anthropogenic energy system (the product of an old building with outdated temperature-control technology), our results reveal how an introduced bird species (from Africa) can tolerate extreme thermal conditions in the novel environment.