Aimee I always remove the old bark/ sphagnum moss, cut off all the dead roots, and repot the orchid in a pre soaked brand new bark. The only thing that work well for me after repotting is when I keep the newly repotted orchid (with the new bark) soaked every week end for at least 15 minutes, in a water with a very tiny dose of orchid food and super thrive. then I let it drain totally before placing it back to its normal location. (My phals are all indoor and get the morning sun.) On weekdays, I just mist them. I keep this regimen until I see new sets of healthy roots.
Then when it looks healthy enough, I just water them weekly (with half dose of orchid food and and super thrive) with rain water preferably, if we have rain. I tend to give it blooming food (once out of every 4 weekly feedings) only closer to colder season. That's when mine usually bloom. Late spring to summer I want them to concentrate growing roots and leaves. Some would still bloom even without blooming food.
I lost a lot from repotting when I get lax with regular watering and misting my newly repotted Phals. In a colder area like yours, you might not need to mist as often because the bark may stay wet longer and orchid does not like wet feet.
On a side note, my weekend watering is done outside in the morning. My husband looks annoyed at me when he sees me haul my orchids outside to get "fresh air".
I do other things while they are soaking or when I'm letting the excess water drain.
