More efficient at doing what?
If you consider only SEER ratings then: no; High Velocity systems operate outside the standard rating envelope and so do not 'show well'. This is because the tests were not designed around showcasing the HV system's superior points.
HV systems operate at lower air volume and discharge a much lower air temperature. This allows them to be far superior at removing moisture from the air stream.
The air ducts are Much smaller and so have lower duct losses.
In my experience the outdoor unit has to be matched to the cooling load By The Compressor Size - and NOT by the outdoor unit's BTU rating.
Higher SEER condensing units / systems get those high SEER numbers by using a smaller compressor with large indoor and outdoor coils. This reduces the high pressure of the system and increases the low pressure of the system. The compression ratio of the compressor is lowered and the volumetric efficiency of the compressor is increased - due to a greater suction gas density. It also increases indoor coil temperature - makes it operate closer to the dew point - and so tends to remove less moisture per operating time.
This 'tricks' the standard compressor rating system somewhat. So a 36,000 BTU condensing unit may have a 29,000 BTU compressor in it.
The thermodynamics 'trick' does not happen with a HV system as the indoor coil operates at just above freezing. Which is why it removes so much more moisture from the air.
HV does have in common with LV systems in that BOTH Require Accurate Installation and Initial Setup in order to operate as they were intended to do.
PHM
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Originally Posted by
eshi1362
Is High Velocity more efficient than conventional system?
PHM
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When faced with the choice between changing one's mind, and proving that there is no need to do so, most tend to get busy on the proof.