I plan to do in floor(concrete) loop design as BBP described, closer spaced exterior to wider interior runs in sq spirals, as it will also help redistribute direct passive solar gain from direct sunlight areas to non. My space is not large(one long zone) so I can do it with two loops to max of suggested length. Would it be more efficient to go with three shorter loops? Easier to balance? I would think this would allow for quicker response and ability to heat more if needed(we can have unexpected cold demands here, in MN average weather is just a statistic)
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