Innovative　cooling　technologies　are　recognized　by　many　industries　as　a　crucial　part　of　their　system　design.　A　large　electrocaloric　effect　(ECE)　and　extended　working　temperature　are　the　key　issues　hindering　the　realization　of　electrocaloric　refrigeration　technology.　In　this　work,　large　ECE　(Delta　T　=　0.8-0.9　degrees　C　@　4　kV/mm)　with　an　ultrawide　temperature　span　from　30　to　120　degrees　C　is　noted　for　lead-free　(Na1/2Bi1/2)(0.80)Sr-0.20(Zn1/3Nb2/3)(x)Ti1-xO3　ceramics.　The　excellent　ECE　performance　can　be　ascribed　to　the　evolution　of　polar　nanoregions.　Our　work　suggests　that　this　material　is　promising　for　applications　in　solid-state　refrigeration　systems　with　a　broad　range　of　operating　temperatures.