
7 hotels in Chicago hold Green Key certification. Each one is audited by an outside body, on a schedule it does not set itself.
Wikimedia CommonsSofitel Chicago Magnificent MileStylish luxury hotel on the Magnificent Mile, featuring contemporary French design and sophisticated amenities. Offers refined guest rooms, fine dininIndependently certified
Wikimedia CommonsPark Hyatt ChicagoLuxury high-rise hotel overlooking the historic Water Tower, featuring refined guest rooms and an extensive art collection. Offers upscale accommodatiIndependently certified
Wikimedia CommonsRadisson Blu Aqua Hotel ChicagoArchitecturally striking luxury hotel in downtown Chicago, featuring iconic wavy balconies and modern design. Offers upscale accommodations, extensiveIndependently certified
Wikimedia CommonsHyatt Regency McCormick PlaceContemporary hotel connected to the McCormick Place convention center, offering modern accommodations and expansive city and lake views. Features versIndependently certified
Wikimedia CommonsHyatt Regency ChicagoLarge upscale hotel in downtown Chicago, featuring contemporary design and extensive conference facilities. Ideally located near the riverfront and MiIndependently certifiedGreen Key audits a hotel against roughly 100 criteria, some mandatory and some scored, covering water and energy use, waste separation, cleaning chemicals, food sourcing and staff training. A hotel applies, documents each criterion, and is then visited on site. Certification runs for one year, so a hotel keeps it only by re-submitting evidence and passing another visit. It is the largest scheme in this catalogue and the one you will meet most often across Europe.
Green Key measures management practice, not carbon. A large hotel with a pool and air conditioning can hold the certificate while using far more energy per guest than an uncertified guesthouse down the road — it is being judged on whether it manages its resources deliberately, not on the size of its footprint. The scoring is also weighted towards documentation, so a hotel with good records can outscore one that quietly does better.