The following is all theoretical. People in Canada use geothermal just for heat in the winter, so I am not sure why it would not be theoretically possible to use it solely for AC in the Philippines. If you are able to use hydronic fan coils to cool with geothermal, then your main energy requirement will be the electricity to run the pumps and the compressor. With this set-up you could use your available panel space for solar PV.
I actually think your best bet is to communicate with air conditioner contractors in the Philippines and find out what the local contractors recommend and are able to maintain. Here's a listing to get you started: http://energy.sourceguides.com/businesses/byGeo/byC/Philippines/byB/serv/install/byP/geotherm/geotherm.shtml
And another: http://goliath.ecnext.com/coms2/product-compint-0000937979-page.html
Here's a list of Philippine renewable energy contractors:
http://www.alternat1ve.com/company-list/
Maud
I'm considering retiring to the Philippines with my wife it's still a few years off. I'm looking into things and electricity is as expensive as it is here on Long Island about $.26+ per kwh I'm seriously considering solar the biggest usage would Likly be ac. Nit sure if geothermal cooling would work there yet. At the $.26 per kwh how would I figure if the roi would be worth while. Also they have lots of brown/black outs there so thats also a major consideration.
Thank you
Bob Calvert
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