WARNING: OFTEN NO HEAT IN MAY, OCTOBER AT THIS HOTEL!
Tonight I have discovered - the hard way - that the Hilton O'Hare has [direct quotes from the operator and hotel manager]... "NO HEAT WHEN THE OUTSIDE TEMPERATURE IS OVER 50F" and "I'm sorry there is nothing we can do"... "it is a situation" and "we are getting SO many complaints tonight you have no idea". The heating and cooling system is supplied from the airport. According to Wikipedia, (http://en.wikipedia.org/wiki/Climate_of_Chicago), the average temperature hovers around 50F in May and October. It a fit of frustration on the phone with the night manager I said "I just checked online and this happens two months per year". His reply - after a long silence - "yes I know". Beware beware beware.