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A comment on Launch HN: Electric Air (YC W23) – Heat pump sold directly to homeowners. Parent comment

Re:Launch HN: Electric Air (YC W23) – Heat pump sold directl... by coryrc on Monday March 13, 2023 @04:16PM (#35141868)
You lose about 30% efficiency using "standardized wiring" with an inverter heat pump instead of a communicating thermostat, because running a heat pump at 33% power continuously instead of 100% power 20 minutes of every hour results in a COP about 30% higher.
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Re:Launch HN: Electric Air (YC W23) – Heat pump sold directl... by raisedbyninjas on Monday March 13, 2023 @05:08PM (#35142680)
Why do inverter heat pump need proprietary wiring? Everything I've seen indicates inverter and dual stage heat pumps can use standard wiring.
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Re:Launch HN: Electric Air (YC W23) – Heat pump sold directl... by coryrc on Monday March 13, 2023 @07:51PM (#35145043)
They don't need it, they just don't get all their rated efficiency, which is much higher than single-speed systems. Single-speed systems commonly have cooling efficiencies around 10-14 SEER, the Gree Sapphire is 38 SEER. If you ran it at only full power, it'd probably only be 30 SEER.
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