VADAVE, I've never heard of any heating system that compresses air to produce heat. I"ve had a geothermal system for 17 years, and it has nothing to do with compressing air. They are simply air conditioners, using Freon, but instead of using 90 degree air to cool the condenser in the summer, and 0 degree air to warm it in the winter, it uses 55 degree water from a ground source to heat or cool the Freon in the condenser. This makes it much more efficient than a conventional air conditioner or heat pump. The system pumps Freon the normal direction to cool, and reverses the direction in the winter. Mine has a propane backup, but if the heat pump is running properly, propane is never needed. Mine intentionally has no electric heat strips, as they are very expensive to operate.
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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