When even so-called experts don't know the difference, you must admit we have a problem here.
Up north of Toronto in Markham, Ontario, Mattamy Homes is building a new subdivision that is going for net-zero emissions. About three hundred homes will have heat pumps connected by pipes to a network of wells managed by Enwave, a company that does district heating and cooling. The company calls the system "geothermal".
© Mattamy Homes submission to Town of MarkhamThe Canadian Broadcasting Corporation is on it, and Philip Lee-Shanok balances the story with Markham community will use geothermal in all its homes, but some critics aren't hot on it. He interviews Tom Adams, an independent energy analyst, researcher and former executive director of Energy Probe, who is skeptical.
"This is one of those things that I wish would really work," he said. "But I think we need to be kind of chastened by history." Adams says in places where there is more geothermal activity, such as Iceland or parts of California, it completely makes sense. However, experiments with the technology in Canada have been less successful.
At this point I wanted to run out of the room screaming, because if a so-called expert and the CBC do not know the difference between real geothermal in Iceland and Ground Source Heat Pumps in Markham, then clearly I have been right all these years when I have said don't call heat pumps geothermal!
I should point out first that Energy Probe is made up of a bunch of climate deniers funded by the oil industry and shouldn't be considered a reputable source, but let's skip that for now and go back to basics.
Ground source heat pumps and geothermal are two entirely different things. 
Gretar Ívarsson/ Wikipedia/ Nesjavellir Geothermal Power Station in Iceland/CC BY 2.0
I have been complaining about the confusion that comes from calling ground source heat pumps (GSHPs) geothermal since I started writing for TreeHugger and tried to define the difference on MNN:
Geothermal systems use heat directly from natural sources like hot springs, geysers and volcanic hot spots like the installation on the right in the Iceland photo above. Ground source heat pumps are essentially air conditioners that use soil or groundwater to cool the condenser instead of an outside coil and fan. It uses electricity to move heat energy from one place to another. Run it backward and it provides heat, and more efficiently than using electricity directly.The industry says it is "is a clean (no fossil fuel consumption) form of renewable energy that involves our sun heating the earth beneath our feet. Through a geothermal system (geo for earth and thermal for the heat from the sun), we use that energy in the ground to heat and cool our homes."
Fine, there is a grain of truth here, When a GSHP is in heating mode, it is indeed moving heat from the ground to the home and that heat can be assumed to be from the sun. However in cooling mode, the GSHP is pumping heat into the already warm ground and there is zero gain of any kind from solar energy. It is not renewable, and it is running on electricity, which could well be made with fossil fuels.
ASHRAE/Screen capture
