I'm a windowsill fan as well
My plants are on southwest, southeast and northwest windows. I don't use additional lighting. They pitcher on all sides, but northwest window has greener leaves and fewer pitchers.
In spring I take them out to the balcony and they stay there until the end of October.
These make pitchers all year (order according to speed and number of pitchers):
1. N. Veitchii (lowland) ---- southwest and southeast window
2. N. Truncata x Ventricosa ---- southwest
3. N. Truncata x Veitchii ---- southwest
4. N. Maxima x Trusmadiensis (2 clones. Other one doesn't do anything) ---- southeast
5. N. Albomarginata, Red ---- northwest
6. N. Smilesii ---- southwest
These guys stop pitchering in winter but they keep growing:
1. N. Maxima 'Tentena' ---- southeast (odd pitcher now and then)
2. N. Miranda ---- southeast, southwest, northwest (odd pitcher now and then)
3. N. Ventrata ---- southeast
4. N. Rafflesiana ---- southeast and southwest
5. N. Hirsuta ---- northwest
6. N. Truncata (highland) (This one is new, still adapting) ---- southwest
Fastest plants (both pitcher and leaf) in spring/summer:
1. N. Ventrata, N. Maxima 'Tentena', N. Miranda, N. Veitchii (lowland), N. Truncata x Ventricosa, N. Truncata x Veitchii, N. Rafflesiana, N. Hirsuta.
These guys didn't make it:
1. N. Khasiana
2. N. Reinwardtiana
One thing I can recommend as a windowsill grower is to pick a place for your plant and never move it again. Even when you move a plant from southwest to southeast, they halt for a while. Also don't be discouraged when a plant seems frozen in time. As long as the leaves and pitchers remain healthy, it means it's going to adjust. It took my Truncata x Veitchii about 6 months to adapt, I almost gave up and put it in a terrarium. After 6 months it started pitchering and now it never stops.
Also I think the most important thing initially is keeping them covered. You cut open the bag a little every day for a month or two. This is the smoothest way to help them adjust.
As a general observation, I find the soft-leaf species have the hardest time adapting. Most of them don't make it. If the plant has thick leaves and is hairy, it's usually fine in low humidity.