That makes it a congressional red sweep and the question now is just how much of a majority will they command in the House? The latest NYT projections here show Republicans do have the needed 218 seats claimed for a majority. However, there are still 9 seats yet to be called.
There are some seats such as Iowa 1 and California 45, which are toss ups, that could go to a recount and take a longer time to settle due to the current margins. For some context, here is a list of the more competitive districts as a reference.
But even if you give those two to the Democrats, Republicans will at least snag Alaska 1 to end with 219 seats. That is the bare minimum that they should win with when all is said and done.