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A Mini split ductless heat pump with a variable dc inverter compressor and dc indoor electric fan motor is going to be far more efficient than a traditional A/C full on-off heat pump. Mini splits also lack the secondary heat strips that traditional heat pumps have, which add tremendously to the electric bill.
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Has anybody on here retrofitted one of these devices into their home? Anybody care to share their experiences? Or, can anybody point me to a website or article with a study of some kind, or hard data on savings?
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Did you try ecomodder's sister site ?
There are several threads there on mini splits.
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I'm in the process of going that route (researching) as my current whole house central air system is nearly 20 years old and will need to be replaced soon.
Since you live in the North, some mini splits are better at providing heat than others. Mitsubishi unveiled a new mini-split ductless AC unit with a SEER rating of 30.5 that produces 100% of rated heat capacity down to 5 degrees Fahrenheit. That is nearly on par with a Geo thermal heat pump for a lot less money.
http://www.mitsubishipro.com/media/9...duct_guide.pdf
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Cobb
Heat pumps do not work well below 40 degrees F. Basically its like a dollar worth of power gives you 1.40 cents worth of heat in the mild winter.
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This unit has a much higher COP than others.
http://www.mitsubishipro.com/media/2...h_brochure.pdf
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