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another thing- the outdoor unit only weighed about 70 lbs and is about 1/3 the size of my central air unit. You don't need to build 'much' in the way of a pad. A couple of patio bricks would easily suffice. I actually had wood 2x4s embedded in my concrete patio to separate the panels. I just screwed the unit to these.
It would be cool to figure out cost per million btus of heat for these machines at different electric rates. These calculators are often on sites for pellet and corn stoves. I've never tried to figure it out for heat pumps with this level of efficiency.
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