The final House of Representatives vote shows a Republican two party vote win 52.95% to 47.05%. I'm unsure if Connecticut or New Hampshire are final but they haven't updated their websites for a month. The 5.9% Republican win is smaller than the 6.9% win in 2010, but more Republican than the Democrats 1.2% win in 2012.
The best way to compare 2012 to 2014 isn't to look at overall votes because there are a number of situations where one party or the other doesn't have a candidate. So that gives can skew the numbers. That's why comparing the 328 districts where a Republican and a Democrat ran in both 2012 and 2014 is the better way to go. And the numbers are very similar. The Democrats' 2012 victory is 1.4% and the Republican victory is 5.6%