Because you can vote to cut short by a week-plus your legislative session (don't want any embarrassing fringe bills coming up, or anything proposed by the opposition, or, in fact, pretty much anything), and go home and spend time campaigning. Because, for the House, it's all about 24×7 campaigning.
Peace Out! House Cancels Work Until After Election Day
The House of Representatives will adjourn until after the midterm election once legislative business is completed on Thursday.Majority Leader Kevin McCarthy’s (R-CA) office announced the schedule change on Thursday, canceling a work day on Friday as well as the entire week of Sept. 29.
It's not like they've been doing anything for the last six years. Gridlock is fun.