Quoting the page:
The image file will emit subtle amount of warmth energy in the environment. You may not necessarily feel warm directly but the environment will fill up with the energy then warming you up over time saving on heating bills over time. You should feel the mp3 more directly. You are trying to manifest a warmer home as you listen and saving on energy and cost. You can play next to a heating source to increase the benefit of the warmth that you feel or keep a copy of the image next to it.
The MP3 directly - image is best next to a heating source, or, alternatively it warms you up over time (adaptation similar to lake divers in Russia)
Seems pretty clear cut… “over time” and the differences between the mandala and mp3 seem very clearly expressed.
Primarily why I found the Thermometer comment bizarre.
You’ll increase the etheric fire element in your home and body, which is felt, but not physically measured.