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Manufacturers seem to be reluctant to add inverter technology to whole house heatpumps. You can buy a 23 SEER AC only system but only about 16 SEER if its a heatpump. I hate trying to deal with the HSPF ratings because I'm just not familiar enough with them.
Split ductless has had the inverters for a little while now I don't know why whole house systems are behind.
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