Quote:
Originally Posted by cobra2411
While I can't answer about multiple evaporators, on the conventional split systems I install I usually go a half ton larger on the evap coil. The added surface area slows airflow and you get better heat and dehumidification.
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Based on ARI ratings for several heat pumps I looked at it appears that 1/2 ton up on the evap coil is good for one point on the SEER scale. This seems to be the standard approach between 14 and 15 SEER.
I could not find any evidence that one ton (two sizes) up on the evap coil results in further improvement. Perhaps 1/2 ton is the edge of diminishing returns.