In preparations for the colder months, I am looking into ways to reduce heating costs in my apartment. I just moved to it in July, so I am not sure how well it handles the colder months. One of the central issues is using space heaters vs a central unit.
I have done research on the topic. The problem is that, in a nutshell, it seems the opinion is that space heaters work for a few small rooms, while central heating is best for large areas and many rooms. However, the set up of my apartment is somewhat unusual. There is a very large living area ( I would estimate it is at least 20 x 20 feet), with approximately 14 ft. high ceilings. This is the room I spend most of my time in, so keeping it warm is important. However, there is also a bedroom that my sister uses - it probably is about 12 x 12 feet - that we also need to keep warm. Additionally, these is a kitchen and bathroom. We would like to keep these warm, but they are secondary to the bedroom and living space.
With this scenario, which option would likely prove more efficient, space heating or central? What form of space heaters would you recommend.