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Have been looking for in the US a ductless mini split heat pump system something like the Mitsubishi Electric Mr. Slim that uses a non proprietary wiring scheme for its wall mounted thermostats. Ideally it would be the standard 24VAC wiring scheme something like (R,G,W,Y,C) that would allow the system to be controlled by a internet connected thermostat such as the Nest, EcoBee, etc...

Most of the ductless mini split systems I have observed come with either fairly complex non internet connected programmable wall thermostat or come with a dumb to complex remote control to mange its operation.

Does anyone know of any ductless systems that offer standardized HVAC controls, remote internet management or other smart home automation capabilities?

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Daikin has the ENVi thermostats. –  user14745 Aug 26 '13 at 19:34

3 Answers 3

up vote 1 down vote accepted

Found some Mini Split units that can use standard 24VAC thermostat controls and it is made by EMI - Enviromaster International LLC - USA. After much searching the only standard 24VAC controllable units found were a handful of EMI's fixed capacity commercial mini split units.

  1. R-410A - WLCG/WLHG Wall Air Handler , Model: R-410A - WLCG/WLHG. The working proof for wiring a standard 24VAC wall thermostat starts on page 11 in the Installation & Operation Manual.

    Additionally they provide two other form factors both offering standard 24VAC control options.

  2. R-410A - CACG/CAHG & CACH/CAHH Cassette Air Handlers , Model: R-410A CACG/CAHG & CACH/CAHH

  3. R-410A - UNCG/UNHG Universal Ceiling/Floor Mount Air Handlers , Model: R-410A - UNCG/UNHG

Again pay attention to the model of EMI unit, some don't support 24VAC controls such as their entire E-verter series. Additionally not sure what kind of prices these units carry, as well as what sacrifices in efficiency are lost due to non smart inverter control, still should be better than central forced air systems, right?

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These links are dead, any chance if having them updated? –  casperOne Jun 16 at 23:49

If you go with the Mitsubishi line of ductless minisplits you can add the MHK1 wireless remote receiver kit that provides a wall-mounted thermostat that can be located anywhere within the wireless range and also connect via RedLINK to the Honeywell Redlink Internet Gateway (THM6000R1002) which provides control and monitoring via the free totalconnectcomfort site as well iPhone/iPad and Android apps.

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There is a very simple to install and inexpensive minisplit adapter that will allow you to control your minisplit system with the Nest thermostat.

You can contact the manufacturer by email at minisplitcontroladapter@gmail.com

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Please declare any affiliation you might have with this product. –  ChrisF 19 hours ago

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