I refinished the floors in my house (built in 1940's and originally hardwood floors). At some time, carpet had been put over the top in all rooms.
When I purchased the house, there was carpet in one room and the previous owner had ripped up the carpets in the other rooms and only used an ugly wood stain in their pathetic attempt to "refinish".
I ripped out the carpet in the one room and sanded all rooms down. Naturally, the unstained room is a bit lighter than the rest of the rooms. However, it doesn't matter that much, because;
It's a different room with different paint colors, different lighting, and different furniture.
If you're using a drum sander and the wood strips are oriented across any of your doorways, then regardless, you won't be able to make it exact. (You'll have to use the edge sander in that area.) Just use the same pass techniques and sand grits and each room and it should turn out well.
- Use a box fan in the window and pointing OUTward to help suck out sawdust.
- If your floor is uneven, do diagonal/angled passes, then the normal passes.
- Don't nitpick while you're sanding; a mark that looks severe when you're sanding may add character when refinished.
- After the first finish coat, do a high-grit LIGHT sand and wipe.
- Once your furniture is in the room, it looks a lot better.