My son is getting ready to replace a system in his townhouse.
The Copeland Scroll UltraTech features two stage operation where the first stage works at 67% of full load. About a month ago, someone here said that some scroll compressors have the first stage working at about 80% of full load. True?
What HVAC brands use the Copeland at 67% and what brands run at other specified loads? And if there are 80% models, what are the good reasons for that split? The 67% seems to make more sense to me.