"Physically, I felt fine and I had fun being back out there," he said. "They were just quicker to pucks and quicker in every aspect."
The Coyotes took a 1-0 lead at 13:25 of the first period when Keller scored with a one-timer off a Schmaltz pass.
Keller scored his second of the game at 16:43 to put Arizona up 2-0, beating Howard with a wrist shot from the top of the right face-off circle, again off a pass from Schmaltz, who has six assists in the past three games.
"I think we play the game a lot like each other, so we can feed off each other really well," said Keller, who has five points (three goals, two assists) in the past three games. "[Soderberg] is huge in front of the net, which creates space and makes it easy to work."
The Coyotes went ahead 3-0 39 seconds into the second period when Howard deflected Soderberg's shot into his own net.