How it works
An entry door is a single swinging door in its own frame, mostly solid, sometimes with a small window, a sidelite or a transom for light. It is the opening you use most and the one that takes the most weather, dust and wear at the threshold.
Where it fits an Inland Empire home
Every house has one, so the question is when to replace it. Usually it is a door that has warped in the sun, weatherstripping that will not seal no matter how it is adjusted, hardware that has been fought with for years, or a dark entry that wants daylight from a sidelite the original opening never had.
What to watch for
On most entry doors the threshold and the perimeter weatherstrip matter more for comfort than the glass does, because most of the door is not glass. A door that closes fine can still leak air all summer, and nobody checks, because closing and sealing feel like the same thing from the inside.
Security lives in the frame, the strike and the threshold rather than in the slab. A strong door in a soft jamb is not a strong door.
If a sidelite or a transom is added or replaced, that glass is held to the same Climate Zone 10 numbers as a window, a U-factor at or below 0.30 and a solar heat gain coefficient at or below 0.23 on most jobs. It is easy to miss when you are shopping for a door and thinking of the glass as trim.
On a retrofit, watch the stucco reveal and the trim where the new frame meets the wall, especially if the brickmould profile differs from the old one or the opening is a non-standard size. Older Riverside houses predate a lot of what counts as standard now.