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A male surveyor using a handheld infrared thermal camera, to inspect the interior of a domestic home, looking for heat anomalies. The camera viewfinder shows a coloured thermal image with varying temperature ranges.

Thermographic inspection of photovoltaic systems by house.Thermovision image of solar panels. Infrared thermovision image. Infrared thermography in inspection of photovoltaic panels.

Spectacular well timmed capture of geotermal eruption at Gullfoss Geysir, The Great Geysir or Stokkur Geyser the most energetic spouting spring up to 40 meters in Iceland after sunset in twilight. Shot on Canon EOS 60D, 11mm wide lens, f4, ISO 800.

Thermal imaging. A thermal imager in the hands of an electrician conducting an inspection of the equipment

New Zealand Champagne Pool in the Waiotapu Thermal Wonderland. The natural hot pool is a 65m wide spring, containing multiple minerals that are presently depositing in the surrounding sinter ledge. The hot spring was formed 900 years ago by a hydrothermal eruption. Rotorua, Geothermal Area Waiotapu, North Island, New Zealand, Oceania

Hot Springs, Arkansas, USA townscape at dusk in the mountains.

Geothermal heat pumps ( GHPs ), sometimes referred to as GeoExchange, earth-coupled, ground-source, or water-source heat pumps, have been in use since the late 1940s. They use the relatively constant temperature of the earth as the exchange medium instead of the outside air temperature.
As with any heat pump, geothermal and water-source heat pumps are able to heat, cool, and, if so equipped, supply the house with hot water.
Illustration from my own archive realized in Adobe Illustrator.

Hot Springs, Arkansas, USA downtown streets with hot spring resorts in the afternoon.

A beautiful dawn in Iceland, a country with many geothermal features including these dramatic fumaroles. Shot with a wide angle lens for dramatic effect and a small aperture to create a sunstar where the sun is just peaking over the horizon. The scenery in Iceland is spectacular and it is becoming a popular tourist destination.

Feet of a woman bathing in the Blue Lagoon next to Reykjavik with people bathing in this natural hot spring .

Japanese hot springs

Hot Spring in Idaho with steam billowing during the morning on a clear day

Young woman relaxing at natural spa with waterfalls and hot springs at Saturnia thermal baths

Pipefitter install system of underfloor heating system at home.

Shot of a mid-adult woman relaxing in the thermal pool at a spa

Climate change global warming clean renewable green energy concept geothermal power station in the Krafla Volcanic region of Iceland

Thermal power station

A thermal Pool in the Fountain Paint Pots in the lower geyser basin of Yellowstone National Park

26 free thermal photos from Freerange

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