Even if you use an ice bath to chill, you can get down to lager pitching temps by submerging some frozen, sanitized water bottles in your wort once it gets down to the 70's or so. I have successfully brewed lagers using a swamp cooler in the summer in my 68F ambient basement, but swapping out frozen water bottles 2-3 times a day is a royal PITA.
I am fortunate in having ambient temps in my basement ranging from 48F-61F right now, and tap water right around 53F. This is prime time for brewing lagers for me right now.