Photo Credits

Last updated October 31, 2026

Most pictures on this site are AI-generated pictures, labelled as such in the caption wherever they appear in a story (the small thumbnails on index pages reuse those same story pictures), because free photographs of the exact scenes (a hail-dented coil, a cooler with its side panel off) are rare. The rest are photographs shared under Creative Commons licences on Wikimedia Commons. All were cropped to fit; where a maker's logo or a name plate was visible it was blurred.

Pictures

• Autumn treetops and Denver buildings below the snow-capped Front Range on a clear dayPhotograph by James St. John, via Wikimedia Commons, licensed CC BY 2.0. Changes: cropped. Used on: Home page.
• Beige evaporative cooler on the shingle roof of a red-brick ranch house in summerAI-generated picture, made for this site. It is not a photograph of a real home. Used on: Swamp Cooler, Central Air or a Heat Pump?.
• Grey central air conditioner condenser on a concrete pad beside a tan brick houseAI-generated picture, made for this site. It is not a photograph of a real home. Used on: Swamp Cooler, Central Air or a Heat Pump?.
• Rooftop evaporative cooler with a side panel removed, showing the cooling pad and blowerAI-generated picture, made for this site. It is not a photograph of a real home. Used on: Opening and Closing an Evaporative Cooler.
• Rooftop evaporative cooler wrapped in a strapped grey winter cover on a snowy roofAI-generated picture, made for this site. It is not a photograph of a real home. Used on: Opening and Closing an Evaporative Cooler.
• Air conditioner condenser coil with fins dented by hail, hailstones scattered on the grassAI-generated picture, made for this site. It is not a photograph of a real home. Used on: When Hail Hits the Outdoor Unit.
• Hailstones covering a backyard patio around battered potted plants after a summer stormPhotograph by Fultron89, via Wikimedia Commons, licensed CC BY 3.0. Changes: cropped. Used on: When Hail Hits the Outdoor Unit.
• Warm upstairs bedroom under a sloped ceiling with a small fan on the dresserAI-generated picture, made for this site. It is not a photograph of a real home. Used on: Why the Upstairs Bakes and What Helps.
• Attic with loose fibreglass insulation between joists and boards laid across the topPhotograph by Scott Arneman, via Wikimedia Commons, licensed CC BY-SA 3.0. Changes: cropped. Used on: Why the Upstairs Bakes and What Helps.
• Brick Craftsman bungalow with a deep front porch and an iron fence in snowPhotograph by Jeffrey Beall, via Wikimedia Commons, licensed CC BY-SA 3.0. Changes: cropped; logo blurred. Used on: Ductless Heat Pumps in Houses Without Ducts.
• White ductless mini-split head mounted high on a plaster wall above a sofaAI-generated picture, made for this site. It is not a photograph of a real home. Used on: Ductless Heat Pumps in Houses Without Ducts.
• Grey gas furnace with sheet-metal ducts and white vent pipes in an unfinished basementAI-generated picture, made for this site. It is not a photograph of a real home. Used on: Furnace, Heat Pump or Both?.
• Heat pump outdoor unit on raised feet beside a house, snow on top and aroundAI-generated picture, made for this site. It is not a photograph of a real home. Used on: Furnace, Heat Pump or Both?.
• Plain wall thermostat showing room temperature with fan and heat or cool switchesPhotograph by TaurusEmerald, via Wikimedia Commons, licensed CC BY-SA 4.0. Changes: cropped; logo blurred. Used on: Thermostats for a Place Where Weather Swings.
• Snowy Denver rooftops at sunrise with the Front Range mountains on the horizonPhotograph by Nicholas Hartmann, via Wikimedia Commons, licensed CC BY-SA 4.0. Changes: cropped; logo blurred. Used on: Thermostats for a Place Where Weather Swings.
• Small white humidifier releasing mist on a side table beside a winter windowAI-generated picture, made for this site. It is not a photograph of a real home. Used on: Dry Winter Air and What to Do About It.
• Thick frost and ice built up along the inside of a window frame in winterPhotograph by Tony Webster from Minneapolis, Minnesota, United States, via Wikimedia Commons, licensed CC BY-SA 2.0. Changes: cropped. Used on: Dry Winter Air and What to Do About It.
• Plug-in carbon monoxide alarm with test button fitted into a wall outletPhotograph by Tony Webster, via Wikimedia Commons, licensed CC BY 2.0. Changes: cropped; logo blurred. Used on: Carbon Monoxide, Gas Furnaces and the Alarm Law.
• Gas furnace with doors closed and blue burner flames visible through the sight windowAI-generated picture, made for this site. It is not a photograph of a real home. Used on: Carbon Monoxide, Gas Furnaces and the Alarm Law.
• Downtown Denver skyline dimmed by a thick brown haze, seen from the western foothillsPhotograph by James St. John, via Wikimedia Commons, licensed CC BY 2.0. Changes: cropped. Used on: Wildfire Smoke, Filters and the Furnace Fan.
• Hands holding a dirty grey pleated furnace filter beside a clean white oneAI-generated picture, made for this site. It is not a photograph of a real home. Used on: Wildfire Smoke, Filters and the Furnace Fan.
• Hazy summer air hanging over the Denver skyline beyond dry foothill grasslandPhotograph by James St. John, via Wikimedia Commons, licensed CC BY 2.0. Changes: cropped. Used on: Ozone Days and the Air You Pull Inside.
• Box fan set in an open sash window with a sheer curtain at duskAI-generated picture, made for this site. It is not a photograph of a real home. Used on: Ozone Days and the Air You Pull Inside.
• Two round outdoor heat pump units tucked among leafy shrubs beside a brick walkwayPhotograph by Kristoferb, via Wikimedia Commons, licensed CC BY-SA 3.0. Changes: cropped; logo blurred. Used on: Xcel Energy Rebates for Heating and Cooling.
• Residential electric meter in a grey socket box on a red-brick house wallAI-generated picture, made for this site. It is not a photograph of a real home. Used on: Xcel Energy Rebates for Heating and Cooling.
• Row of red-brick foursquare houses with front porches on a tree-lined Denver streetPhotograph by Gtj82, via Wikimedia Commons, licensed CC BY-SA 3.0. Changes: cropped. Used on: What Denver Requires When You Replace.
• Installer kneeling beside a new heat pump outdoor unit by a brick house, gauge set connectedAI-generated picture, made for this site. It is not a photograph of a real home. Used on: What Denver Requires When You Replace.
• Stack of invoices, receipts and a form with pen and calculator on a kitchen tableAI-generated picture, made for this site. It is not a photograph of a real home. Used on: Heat Pump Tax Credits: State and Federal.
• Grey heat pump outdoor unit on a pad in a mulch bed beside blue sidingAI-generated picture, made for this site. It is not a photograph of a real home. Used on: Heat Pump Tax Credits: State and Federal.
• Technician reading a refrigerant gauge set beside an outdoor unit by a brick wallAI-generated picture, made for this site. It is not a photograph of a real home. Used on: How to Choose a Front Range Contractor.
• Cream-brick Denver bungalow with dormer, iron fence and a quiet front walkPhotograph by Jeffrey Beall, via Wikimedia Commons, licensed CC BY-SA 3.0. Changes: cropped; logo blurred. Used on: How to Choose a Front Range Contractor.
• Newly installed grey furnace with shiny galvanized ductwork and white vent pipes in a basementAI-generated picture, made for this site. It is not a photograph of a real home. Used on: Permits and Inspections for a New System.
• Clipboard with a blank checklist resting on a new furnace beside fresh ductworkAI-generated picture, made for this site. It is not a photograph of a real home. Used on: Permits and Inspections for a New System.

Video stills

• Inside the Aerocool Pro SeriesPhoenix Manufacturing, on YouTube. Still picture from YouTube, shown until you press play. Used on: Swamp Cooler, Central Air or a Heat Pump?.
• 10 Winterizing TipsPhoenix Manufacturing, on YouTube. Still picture from YouTube, shown until you press play. Used on: Opening and Closing an Evaporative Cooler.
• Why Is My Upstairs So Hot? HVAC Fixes for Uneven Temperatures in Two-Story HomesLennox Learning Solutions, on YouTube. Still picture from YouTube, shown until you press play. Used on: Why the Upstairs Bakes and What Helps.
• Whole-Home Solution for 110-yr-old House (Columbus, OH)Mitsubishi Electric Trane US, on YouTube. Still picture from YouTube, shown until you press play. Used on: Ductless Heat Pumps in Houses Without Ducts.
• Colorado Energy Office: Short building codes training video - Heat PumpsColorado Energy Office, on YouTube. Still picture from YouTube, shown until you press play. Used on: Furnace, Heat Pump or Both?.
• Energy Saver: Setting Your Thermostat for Comfort and SavingsU.S. Department of Energy, on YouTube. Still picture from YouTube, shown until you press play. Used on: Thermostats for a Place Where Weather Swings.
• AprilAire | What is Humidity?AprilAire, on YouTube. Still picture from YouTube, shown until you press play. Used on: Dry Winter Air and What to Do About It.
• Carbon MonoxideFrederick County Fire & Rescue Training, on YouTube. Still picture from YouTube, shown until you press play. Used on: Carbon Monoxide, Gas Furnaces and the Alarm Law.
• Air Quality Health Due to Wildfire Across ColoradoCDPHE, on YouTube. Still picture from YouTube, shown until you press play. Used on: Wildfire Smoke, Filters and the Furnace Fan.
• Air Quality and Ground-Level Ozone in Larimer CountyLarimer County Department of Health & Environment, on YouTube. Still picture from YouTube, shown until you press play. Used on: Ozone Days and the Air You Pull Inside.
• Module 1: Introduction and Why ElectrifyLearn with The City & County of Denver!, on YouTube. Still picture from YouTube, shown until you press play. Used on: What Denver Requires When You Replace.
• Tips for Hiring an HVAC ContractorContractors State License Board, on YouTube. Still picture from YouTube, shown until you press play. Used on: How to Choose a Front Range Contractor.
• How to add a Residential Construction Permit to quick permit applicationsDenver Community Planning and Development, on YouTube. Still picture from YouTube, shown until you press play. Used on: Permits and Inspections for a New System.