Duty Cycle and CoP
I have 2x 12K Fujitsu’s hooked up to a 24k Multi, non hyper heat. In my attic office, it is way oversized so I run it on low fan speed for heat.
When just using the single attic 12k, the outdoor unit spins for 2.6 minutes, then is off for 2 minutes. Inside, the fan is in the sensing temp speed extra low, and then will go to low for 10 seconds. Obviously short cycling. Outdoor temps in the low 40s.
If I add in the first floor 12k split which I have on high speed (it runs almost continuously), the attic head now runs for 3 minutes on low, and is off for 17 minutes.
How do these scenarios differ for either kWh usage or CoP regarding attic usage? Or is it pretty marginal at these outdoor temps?
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