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The heater core engine coolant charge dehumidifies the HVAC intake air. That’s almost half the “need” of creating a comfortable environment. Allows for lowered compressor run times.
Where summer heat is such that bypassing the core becomes attractive is evidence that the HFAC system is not up to the task.
Vehicle insulation, window tint, window covers, shaded parking are all parts of the approach that reduces demand.
“Demand” is the problem. Design engineers aren’t stupid. But disablement is really a sign that one is delaying maintenance, repairs & upgrades past informed use.
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