It's just an old word for a bedroom. It was replaced by "bedroom" when washing stands and chamber pots were replaced with separate bathrooms.

from Middle English chaumbre; from Old French chambre; from Late Latin camera, chamber; from Greek kamar.

Krycek, were the terms used together on the same house plans? Or were they always in separate houses?

Based on what Macv said, that the "chamber" was used prior to indoor plumbing took away the wash stand and the chamber pot,
could it be implied that

1. A CHAMBER still had a wash stand and chamber pot serving it?

2. The BEDROOM meant there was indoor plumbing and no need to look for a chamber pot under the bed or elsewhere?

Very interesting question.

The Victorians were very pretentious. There were lots of French words in their vocabulary and chambre is simply a french word for room, still in use btw.

Chamber smacks of intimacy and privacy compared to bedroom....and people took to their chambers to get away from it all for a read or a nap. Most of my Victorian and Edwardian age homes had very large bedrooms, and we put a table and chairs in them to take our morning tea or coffee, a desk, book cases. They were for more than just sleeping.

That sounds like a very reasonable and correct explanation, calliope! How nice it would have been to have a room to retreat to like that. It's just my partner and I so we do have a "chamber" type of room upstairs we can retreat to. It's very nice indeed.

Chambers were bigger then 10’x11’ and 10’X11’ or smaller were bedrooms

In a time when houses were poorly insulated and windows leaky, rooms were small. Thus, people had small rooms that were easier to heat. Many older houses have been modernized to have fewer, bigger rooms.