Equipment
Variable-speed
Compressor or blower technology that adjusts output continuously instead of running full-blast or off. A variable-speed system might idle along at 40% capacity for hours rather than blasting for ten minutes and stopping.
Why it matters for your home
In St. Louis humidity, those long gentle cycles are the difference between 'cool' and 'comfortable': more running time wrings more moisture from the air, temperatures stay steadier, and the system runs quieter. It's the premium tier for a reason, and the comfort difference is what owners mention more than the bills.
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