Just bought this gorgeous plant for $5 at a local stop and shop !

Any tips for raising this puppy to its 'full' potential in a north-facing window?

Hello and welcome! I would suggest to learn how to water right, with this plant success most of the times relies on proper watering. Moist but not saturated. Do not wait for the leaves to droop until you water, as every time this happens, some roots sustain minor damages, that get added by time. Check the soil with sticking your finger in or a wooden skewer. Never place it near a heater. I won't say that it cannot live in front of a north window, but I noticed with mine that it did better in medium light conditions, not low light ones. So, in case you have a position that gets more light than this window, I'd suggest you put it there. No direct sunlight, just indirect to medium light.
Good luck with your beautiful plant!

Thanks Faridat! I will take that advice!
And unfortunately I do not have access to any other window! (but my north-facing window has a very slight westward face too, so not all is lost!) I will eventually post an update of my plant's health!

A north window is just right for a Peace Lily. It needs protection from the rays of the sun falling directly on its leaves. But that means it also must be close to and in front of the north window to get enough light.

Water your Peace Lily thoroughly until a bit of water runs through the drain holes. Then watch it carefully and see how long it takes before it starts to just barely wilt. That will give you a pretty good idea how long it can go between thorough waterings. Occasional wilting will not cause permanent damage.

Fertilizer it monthly at half strength to encourage flowers. Also keep it potbound for improved flowering.

Good to know @WillC, thanks for the pointers!
What type of fertilizer is good for it? is diluted 14-14-14 good?

Any complete fertilizer is fine. Dilute it to half the recommended rate on the label.