I was in Tucson about 5/6 years ago....quite warm. Which made me think about cooling the hydraulic oil. The company that I work for has hydraulic pumps on the trucks for operating the liquid product pump. Either the tank is reasonably large to become a radiator or the oil runs through a little rad for cooling. This may adviseable for you.
Where Vlad is, the earth is cooler (I would think) than where you are, since the solar strength is not as strong. This may give the reason for installing a bigger loop system. However, I am only surmising; you'll need the full facts.
My current monthly budget for heat is about $70/month for 10 months, and my house is 22 feet square, Cape Cod style. Insulation and air sealing goes a loooooong ways.
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TomS
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