I recently moved into a 1930's house with a masonry fireplace. the fireplace has no hardware or accessories, other than a grate. We would like to use the fireplace to heat our house this winter. In addition to having a chimney sweep come out and inspect and clean the chimney, I am trying to figure out what we need to buy. I have been looking on the web, but have become more confused about two items: a screen and glass doors. Glass doors appear to be installed directly into the fireplace (flush with the opening). Often, inside the glass doors there is a sliding screen. But I have also seen screens that appear to sit just outside of the fireplace (although some are flush). But if you had flush glass doors, it appears to make no sense to have a screen outside of it. I assume I have three choices: (1) screen only (flush or otherwise) (2) glass door only (3) glass door with screen inside I assume glass + screen is the best? What are the downsides of only having a screen or only having a glass door?