I think you live in great area for training type commute. If you don't have absolute need to drive the car once you get to home, you could do half way to build yourself up. One day climbing up, next day riding down for reward... and driving back up.... repeat. Also gives you more days you are riding (not more distance...) so your body can adapt better (especially the downhill can be used as recovery ride)
Kind of what I did as my commute was 15 miles one way with about 1800ft of climb one way and 200ft the other... Eventually started having some days where I would drive a little less, less. I only drive now a days when I really need my leg rested after hilly centuries, or want to do return trip of 45miles without train I use in between for endurance training.