sun porch

noun

a windowed porch or porchlike room having more window than wall area, intended to receive large amounts of sunlight.
an open pen, raised above the ground, for giving poultry light and air under sanitary conditions.

Origin of sun porch

An Americanism dating back to 1915–20

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Then they went at the other rooms, the sun-porch room and the dining-room.
Cloudy Jewel
Grace Livingston Hill
The presence of the bishop reminded him unpleasantly of the Porters' sun-porch and of the disgraceful encounter there.
The Main Chance
Meredith Nicholson