VRF system for ductless
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I am looking at the Mitsubishi HyperHeat ductless systems, but was doing some online research regarding VRF systems. Does anyone have any thoughts on one vs the other and which VRF system is preferred?
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Mitsubishi's Hyper Heat systems are all VRF, but not as fully or in the same way that Mitsubishi's City Multi or LG's Multi-V systems are.
Sizing it correctly for the loads is the most important thing. The smallest City Multi is something like 5 tons, and way oversized for the loads of most new houses (or even older ones.)
LG's Multi V S series is a full-on VRF approach with most of the same features at the Multi V (no "S") , but on a smaller scale, and can be sized as small as 2 tons, but the heat recovery feature is only available in the 5 ton version:
https://lghvac.com/commercial/product-type/?productTypeId=a2x44000003XR0O&iscommercial=true&class=Outdoor%20Units
https://lghvac.com/commercial/product-type/model-details/?productTypeId=a2x44000003XR0O&modelId=01t44000008fw8H&modelNumber=ARUN024GSS4&iscommercial=true&class=Outdoor%20Units
Mitsubishi has a little teaser on their City Multi page about an "N Generation - Hyper-heat" informing us that it will be "Arriving Summer 2019".
https://nonul.mylinkdrive.com/R2-Series/R410A+Systems/R2+Series+OD+Units/
Maybe they will have a single family residential scale model in there, but don't hold your breath. There was some experimental work done a handful of years ago using City Multi hydro modules with MXZ hyper heat compressors, but not a peep about it since 2015.
https://aceee.org/sites/default/files/pdf/conferences/hwf/2015/4D-Doppel.pdf
Mitsubishi does have some smaller VRF systems as small as 3 tons, but they have limitations on operating temperature, and are definitely NOT "Hyper Heating". eg:
http://meus1.mylinkdrive.com/files/M_PUMY-HP_P-NKMU_2_DATABOOK_M-P0779_02-19.pdf