Inverter modulation floor and mini-split oversizing

An inverter throttles down only to its minimum output — about 28% of rated for a single-zone head. Oversize it and the everyday load falls below that floor, so it short-cycles instead of running low and steady.

Two vertical capacity bars. A right-sized 12k head has a modulation band down to a minimum of about 3.4k BTU per hour; an oversized 24k head can only throttle down to about 6.7k. A shared dashed line marks a mild-day load of about 4k. The 4k load sits inside the 12k head’s green modulating band but below the 24k head’s floor, in the red short-cycling zone. — Source: Manufacturer minimum-modulation data; ACCA Manual S

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Two vertical capacity bars. A right-sized 12k head has a modulation band down to a minimum of about 3.4k BTU per hour; an oversized 24k head can only throttle down to about 6.7k. A shared dashed line marks a mild-day load of about 4k. The 4k load sits inside the 12k head’s green modulating band but below the 24k head’s floor, in the red short-cycling zone.

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