Photo Credits

Photographs

Each photograph was resized and saved as WebP for this site. Where a maker's logo or other marking showed, it was blurred; that is noted on the photo. Otherwise the images are unchanged apart from cropping and resizing.

Photo 6. Bakersfield street in tule fog. A residential street of one-story stucco houses with tile roofs, lawns and palm trees in thick grey tule fog, Bakersfield, January 2006. By an unnamed original uploader on English Wikipedia, licensed CC BY-SA 3.0. Original file on Wikimedia Commons.

Photo 8. Duct leakage test in a hallway. A technician reads a pressure and flow gauge while a duct test fan, connected by a flex hose to a taped-off wall register, pressurizes the ducts. By Ket555, licensed CC BY-SA 4.0. Maker names on the gauge and shirt were blurred. Original file on Wikimedia Commons.

Photo 25. Wall thermostat. A smart thermostat on a living-room wall showing a cooling hold, humidity and an air-quality reading. By Xynorath, licensed CC BY-SA 3.0. The maker's name was blurred. Original file on Wikimedia Commons.

Photo 26. Ranch house with a roof cooler. A mid-1950s California ranch house with an evaporative cooler on its roof. By Mcheath on English Wikipedia, released into the public domain (Public Domain Mark 1.0). The house number was blurred. Original file on Wikimedia Commons.

Photo 42. Orange wildfire-smoke sky over the Bay Bridge. The San Francisco–Oakland Bay Bridge and the Financial District under a dark orange daytime sky from North Complex Fire smoke, September 2020. By Christopher Michel, licensed CC BY 2.0. Original file on Wikimedia Commons.

Photo 43. Walnut orchard in tule fog. Rows of bare winter walnut trees fading into fog near the Sacramento River in Butte County, New Year's Day 2024. By Frank Schulenburg, licensed CC BY-SA 4.0. Original file on Wikimedia Commons.

Photo 44. Flex duct over blown-in attic insulation. A foil-jacketed flexible duct across deep blown-in insulation, with radiant-barrier foil on the rafters above. By Jason Dale, licensed CC BY-SA 3.0. Original file on Wikimedia Commons.

Photo 45. Spiral sheet-metal ducts. Bare galvanized spiral round ducts and an elbow hung under wood ceiling framing in a refuge office under construction. By Ron Hollis, U.S. Fish and Wildlife Service, Northeast Region; a U.S. government work in the public domain (Public Domain Mark 1.0). Original file on Wikimedia Commons.

Photo 46. Dusty ceiling supply diffuser. A square stepped diffuser in an office drop ceiling with dark dust streaks on its louvers. By Tony Webster, licensed CC BY-SA 2.0. Original file on Wikimedia Commons.

Photo 47. Box-fan air cleaner. A home-made box-fan air cleaner with pleated furnace filters taped around its sides. By Festucarubra, licensed CC BY-SA 4.0. A logo was blurred. Original file on Wikimedia Commons.

Photo 48. Ductless indoor unit. A newly installed wall-mounted ductless indoor unit below an unfinished ceiling with line-set covers, in a refuge office. By the U.S. Fish and Wildlife Service, Northeast Region; a U.S. government work in the public domain (Public Domain Mark 1.0). The maker's logo was blurred. Original file on Wikimedia Commons.

Photo 49. Blowing attic insulation. A worker in a protective suit and respirator blowing loose insulation over the ceiling joists of a long attic in a hatchery building. By Rob Holm, U.S. Fish and Wildlife Service, Mountain-Prairie Region; a U.S. government work in the public domain (Public Domain Mark 1.0). Original file on Wikimedia Commons.

Photo 50. Central air condenser. A residential condenser on a pad beside a brick wall, its refrigerant lines entering the house. By H Padleckas, licensed CC BY-SA 3.0. The maker's logo and a camera date stamp were blurred. Original file on Wikimedia Commons.

Photo 51. Sacramento skyline and Tower Bridge. Downtown Sacramento across the Sacramento River under a clear sky, with the gold Tower Bridge at right, April 2026. By Quintin Soloviev, licensed CC BY 4.0. Original file on Wikimedia Commons.

Photo 52. Delta levee road. A rock-faced levee with a gravel road curving beside a channel in the Sacramento-San Joaquin Delta, August 2011. By the U.S. Army Corps of Engineers, Sacramento District; a U.S. government work in the public domain (Public Domain Mark 1.0). Original file on Wikimedia Commons.

Pictures and figure cards made for this site

The other pictures numbered 1 to 31 are photo-realistic images made for this site with an image model, because no free-licensed photograph showed the exact scene, such as a duct slipped off its collar or mastic being brushed onto a joint. Each carries the caption "AI picture, not a real home." They show typical scenes; they are not photographs of real houses, people or equipment, and no maker's name or logo appears in them.

The figure cards on article pages, which show a page's key numbers, were drawn for this site from the cited figures. Each number on a card comes from a source named on the card and linked in that page's text.

The duct-run diagram on the home page was also drawn for this site. For how pages are researched, see About Valley Home Ducts.