A 20' by 14' room measures 31.1 square yards.
It is impossible to answer the question sensibly. First, the question does not give any information on the units used for the measurements of the room. Second, 20x14 is a measurement of area - in some unknown units. A yard is a measure of length, not of area. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
The average cost of a 20 x 14 sun room varies greatly depending on the materials used and the area where the sun room is being built. On average, a sun room this size would be about 18,000 dollars or more depending on the number of windows.
This JCPenney floor lamp, end table and magazine rack combination makes it easy to combine living room necessities in one efficient piece. It offers a 54"H magazine rack floor lamp; 20x14" diameter table top; 6x16x11"H shade and the lamp uses a 150 W light bulb. Not only is this piece functional, it is also beautiful adding a sophisticated flair to any living space.