Quote:
Originally Posted by Student 07
...But, if the air outside is, say 55-65*f, then the heat pipe would be cooling your incoming air when you still need heat...
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You might be over-thinking this thing a bit...
I don't know about your house, but my house is pretty much in balance when the air outside is 55-65 degrees, and just the additional heat generated by cooking, TV and very low power lighting keeps the place pretty comfortable.
A heat tube should be buried at least 3 ft deep (in our part of the world), more is much better. But during the days when the winter air temperature is hovering in the mid 30's to low 40's (as it does in the lovely Portland winters) the heat boost (underground temps here are around 54F) from an underground heat tube would be a very welcome addition to incoming fresh air temperature, before it hits the HRV.
And it's quite difficult to put a dollar value on the feeling of health and wellbeing that comes from breathing fresh, clean air.
Best,
-AC