Larry Sabato’s Crystal Ball: “The 2018 House election cycle was defined by an unusually large number of open seats. The 2020 cycle almost certainly won’t feature as many, but there are still more than two dozen so far. And just like in 2018, the open seats that cover competitive turf provide more opportunities for Democrats than Republicans.”
“The open seats have a decidedly Republican lean: Of the 28 open seats, more than two-thirds (20) are currently held by Republicans, while just eight are held by Democrats. Most of these open seats will be easy holds for the incumbent party: 20 of the 28 are rated as Safe Republican or Safe Democratic.”
“However, eight of the open seats are competitive to at least some degree in our ratings, and all but one of those are currently held by Republicans. This gives Democrats more of an opportunity to net seats from the list of open seats, at least so far.”

