None of that thinking applies to these mini-splits. My Mitsubishi has a variable speed compressor and can ramp down to as low as 25% of the nominal capacity. This means it runs all the time but can ramp up as needed. It appears to run at the 25% level, as far as I can tell, most of the time. I doubt it cycles off at all. It is too bad The Villages didn't choose Carrier systems for the house with variable speed compressors. It is better for the system to run continuously at a lower compressor speed then to cycle on and off.
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Originally Posted by TrapX
There are 2 pieces to sizing.
Obtaining desired temperature is only half of the story. Run time short or long will cool temperature. Longer runtime will improve the evenness because more time to circulate. Short runtime starts to short cycle the compressor, leading to unnecessary wear.
You must also reduce humidity to feel comfortable. That happens from run time. Longer run times from a smaller unit will drop humidity most effectively. Short runtimes from an oversized unit will leave you cool and sticky. That's awful.
This is not like a car where a big engine will get things done quicker. Don't be tempted to "go a little bigger" because it's not a lot of more money. It does not scale like that. You will pay more for worse results.
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