Photo credits

Photos are from Wikimedia Commons and Flickr, used under the licences shown. Some were cropped or resized.

rooftop.jpg: Air Conditioning units on the roof, hospital building, 2021, 03.jpg by Kgbo, CC BY-SA 4.0
heat-pump.jpg: Carrier Outdoor Split Air Conditioner Heat Pump System (55005181522).jpg by Tony Webster, CC BY 4.0
split-indoor.jpg: Air conditioner 2.jpg by Solijon Solayev, CC BY-SA 4.0
thermostat.jpg: Setting the temperature on a digital thermostat while standing by a wall in the home during an indoor activity.jpg by Shixart1985, CC BY 2.0
outdoor-garden.jpg: Outdoor air conditioner unit installed in residential garden space.jpg by Shixart1985, CC BY 2.0
ductwork.jpg: Air conditioning ductwork in large commercial building, Brisbane.jpg by Kgbo, CC BY-SA 4.0
air-handler.jpg: HVAC Air Handler Unit, pic1.JPG by Alf van Beem, CC0
winter-unit.jpg: Ecodan outdoor unit in the snow.jpg by PeterEastern, CC BY-SA 4.0
technician.jpg: HVAC Technician installing air handler by SuperTech HVAC Services, CC BY-SA 2.0