Things have changed a lot since I was last in residential service... All warranty service calls called in outside of regular service hours were considered split calls with the customer responsible for the difference between regular and OT labor. Everything else was the same and any warranty was handled the same as a regular time call. We did run a lot of "late day" calls that came in after 4PM as regular calls, no matter what time they were run. I really didn't have any significant problems with customers, but did make the boss a little upset going behind other techs after maintenances and turning the call in as warranty due to something missed or forgotten. This only bit me once when I found out Monday that we had quoted a major system repair and the customer had lied to me. We lost the value of the 1 hour off hour service, but got a dual fuel system changeout with an extended warranty from the response, so I kept my tailfeathers!