Jimjam July 10, 2017 05:45 AM How is this different to a regular heat pump? usugo July 10, 2017 06:22 AM for that money, it is probably cheaper to install a PV or eolic system and use electric heaters in the winter and air conditioners in the summer NicolasMarshall July 10, 2017 11:01 AM A company selling the same heatpumps that have been available for at least a decade, how is that a "moonshot" startup ? SteveO July 10, 2017 12:20 PM Geothermal heat pumps have been around for a long time. I know several people with them. I'm not seeing anything new here. Do people really think that just because Google does it, it will be magically better? Mark SC July 10, 2017 12:33 PM Google should have just purchased one of the companies that has been in this business for years. Ground source or geothermal heat pumps are nothing new. They work great, are quite, and very energy efficient. But Google certainly didn't come up with any new ideas here....at least nothing described in the article. chizzy July 10, 2017 12:39 PM Earth coupled heat pumps. my dad installed these in rural Oklahoma in the 80s. very much not new technology. even the study that said you could put these everywhere is not new. MKO July 10, 2017 12:45 PM I have geothermal on my house already and love it! I also have a 5400 watt PV system. The fluid in the geothermal unit is similar to industrial strength wind shield fluid. It has an alcohol base instead of glycol. 4000 ft of poly tubing is coiled and buried 8 feet deep in the front lawn area. The natural soil was used to back fill, but I suspect if you filled the trenching part way with bentonite slurry the system would have been more efficient. wal62 July 10, 2017 12:58 PM These system use the 68 degree natural earth coolness, just within 6" under your yard. Think all new homes should include this in original building. Can you imagine how cheap cooling, heating your home just happened? Unfortunately, to dig up your yard( horizontal geothermal system, or drill down(well style geothermal), can expensive. Solar is now cheaper. Yet a handy person can build this themselves, if motivated. clay July 10, 2017 01:39 PM The business model seems to be the key differentiator. It appears they are following SolarCity's footsteps, as applied to geo-therm. The glaring exception is SolarCity sells excess power to the grid. Maybe Dandelion has an MRR model with a positive ROI? I hope so, it seems $20K in npv/sunk cost is a *LOT* to recoup without the ability to sell unused/excess heat/cool. A mortgage matching service life (~30 years) seems necessary. I am a fan of geo-therm and so it is good to see efforts to make it affordable. If Alphabet has some magically advanced method or process which brings down the implementation cost, then perhaps it will help the industry...though this too seems unlikely given the $20K price tag. Bruce H. Anderson July 10, 2017 02:02 PM Jimjam, the difference is that in the winter and summer you are using a 58F liquid in the heat pump exchanger, instead of 100F air in the summer and 34F air in the winter (and below 34F you need electric booster heat). I assume the water heater is connected to gather waste heat from the heat pump, but that is not clear. But this is OLD technology, albeit quite effective and expensive. I would expect that the water in the loop will need regular treatment, unless it has something to eliminate corrosion like a water/glycol mix. Unless this "clean drilling technology" is something uber whiz-bang, what we have here is just marketing hype.