Nanotech9
What you say makes sense, just the amount of pipe required is very large then, If you check a link I give near the begining of this topic, someone tried this and it heated up, maybe there was not enough pipe?. The coil down a hole is a good idea but I'm not sure I want it any cooler now due to condensation issues when the ambient/humidity is high.
Do you have any info links or specs? as I'm really interested to build this into my house. Like you say it's quieter than aircon, (although not as cold), but more importantly near as damn it free to run.
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