When I encounter the hills on my daily commute, I approach them differently just to give myself some variation.

Sometimes I keep in high gear and push as hard as I can all the way up. Sometimes I keep in low gear and keep at steady cadence as when I'm on level ground. Sometimes I'm in moderately high gear and peddle pretty slowly trying not to break a sweat. Sometimes I race to the hill on high gear and down shift as I feel the deceleration climbing. Sometimes I zigzag on the way up simulating a lower grade climb.