Glass for a West-Facing Wall
A glass wall facing west in San Bernardino needs a glass package built for afternoon sun, because the city's record high is 118F, set in July 2018, and a wall that used to be mostly stucco is now mostly glass. Glass is a poor insulator. The answer is a dual-pane unit with a Low-E coating, a thin metallic layer that lets visible light through while cutting the infrared heat that comes with it, plus a thermally broken or insulated frame.
Every NFRC door label lists the U-factor and the SHGC for that door's glass configuration. U-factor measures how much heat moves through the unit, and lower is better. SHGC measures how much solar heat comes in, and on a west wall a low number is the one you want. For window replacements, San Bernardino County's guidance lists a U-factor of 0.30 and an SHGC of 0.23 on the prescriptive path, and it wants the labels on the product at final inspection.
All glass in a door is safety glazing, and code requires tempered or laminated glass in sliding doors and in glass near a pool. Tempered glass is about four times stronger than ordinary annealed glass and breaks into small, blunt pieces. It cannot be cut after tempering, which is one reason panel sizes are fixed at the factory from our measurements.