B737-700 FLT CREW SUSPECTS DAMAGE TO L4 AND R4 WINDOWS AS A RESULT OF IMPROPER CHKLIST PROCS.

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BECAUSE OF MY ACTIONS; I BELIEVE L4 AND R4 WINDOWS WERE DAMAGED ON MY ASSIGNED ACFT. DESCRIPTION OF EVENTS: DUE TO WX; WE WERE ON AN EXTENDED GND DELAY IN BWI AND ELECTED TO SHUT DOWN BOTH ENGS. UPON REACHING OUR ASSIGNED PARKING LOCATION; I DID NOT CALL FOR THE 'DUAL ENG SHUTDOWN CHKLIST;' BUT RATHER RAN IT MYSELF; AS THE FO WAS BUSY CONTACTING DISPATCH AS I HAD INSTRUCTED HIM TO DO. ABOUT THIS TIME I BELIEVE; OUT OF HABIT; THE FO TURNED OFF THE WINDOW HEAT. I DID NOT NOTICE THIS AND IT PROBABLY WOULD NOT HAVE OCCURRED HAD WE EXECUTED THE SHUT DOWN CHKLIST PROPERLY; THAT IS CHALLENGE AND RESPONSE. WE DID CORRECTLY RUN THE TAXI START CHKLIST WHICH; OF COURSE; DID NOT MENTION WINDOW HEAT AS IT IS DIRECTLY RELATED TO THE SHUTDOWN CHKLIST. RESULTANTLY AND INADVERTENTLY; WE DEPARTED WITHOUT THE WINDOW HEAT ON. ENRTE; WE HEARD A FEW POPPING SOUNDS BUT MADE NO CONNECTION; IF THERE WAS ONE. DURING DSCNT; I FINALLY NOTICED THE ERROR AND TURNED ON WINDOW HEAT AND DEFROST AIR. AFTER SHUTDOWN; THE FO NOTICED L4 AND R4 WINDOWS WERE CRACKED. MAINT WAS NOTIFIED AND DISCREPANCIES ENTERED INTO ACFT LOGBOOK. NOTE: DURING CASUAL CONVERSATION WITH MAINT; THEY INDICATED WINDOWS MAY HAVE CRACKED DUE TO HEAT BEING APPLIED TO A VERY COLD WINDOW. I AM NOT SURE IF CRACKING OCCURRED DURING DSCNT OR ENRTE (REF PREVIOUSLY MENTIONED POPPING SOUNDS). DURING DSCNT; IT SEEMED WINDOW HEAT WAS REQUIRED DUE TO FROST ON THE WINDOWS. IN HINDSIGHT; DEFROST AIR MAY HAVE BEEN ADEQUATE. PRIMARY FACTORS: 1) IMPROPER USE OF CHKLIST; PARTLY DUE TO DISTR. 2) SHUTDOWN HABIT PATTERNS. 3) RARELY USED CHKLIST/PROC. 4) FATIGUE ON THE DSCNT PORTION OF THE FLT.