"He works hard every shift, regardless of what line he's on or how much ice time he's getting, he's ready to go," Kuemper said of Garland. "I think that's a contagious thing to watch and it gets everyone else working as well."
Garland scored again to make it 3-0 at 6:34 of the second by deflecting Nick Cousins' wrist shot that struck Kevin Shattenkirk's skate. Each of Garland's goals was credited to the initial shooters before being changed.
A fifth-round pick (No. 123) by the Coyotes in 2015, Garland has three goals in his past two games and five in 15 NHL games.
"I think I feel more comfortable every game. I get to see film after the game, talk to the coaches and pick up new things, work after practice and go over things," Garland said. "I'm feeling a lot more comfortable and it's slowing down."
Arizona had scored one goal or fewer in seven of its previous 12 games.
"When we got those first two goals, I could feel the bench and everyone relax," Coyotes coach Rick Tocchet said. "We were creating turnovers, and that's the way we have to play. We have to play hard like that."
Keller, selected to the 2019 Honda NHL All-Star game, scored for the first time since Dec. 1 to make it 4-0 at 15:13 of the second.