With 90% of the votes counted, CNN calculates that Republicans have received 52,179,411 votes for U.S. House, and Democrats have received 47,504,278. See this article. If one scrolls down below the Oregon section, one finds the national totals. CNN does not have any data for minor party or independent candidates for U.S. House. Also the CNN figures includes the votes cast for major party nominees on minor party lines, in New York and Connecticut.
CNN updates the numbers constantly. Thanks to Mark Scarberry for the link.