The All Blacks found themselves 6-10 down at half time, but they rallied in the second half to earn a narrow 28-27 victory against the tourists.
The result has seen the world champions take an unassailable 2-0 lead in their three-Test series with England.
"It was a great game of rugby. There was a lot of calmness at half time," Hansen told Sky Sports News. "We knew we were in an arm wrestle and just had to hang in there. We thought we did enough in the first half to be in front, but we hadn't taken the opportunities.
"I don't think there is a big difference between the sides, but in the heat of the battle we managed to get things to go our way. Both sides can be proud of their performances."
New Zealand play the third and final Test against England next Saturday in Hamilton.