Thanks for this! Extra info like this is helpful for some.

The best DIY system you can do right now is Mr. Cool. Mitsubishi and LG are not fully DIY systems based on what the manufacturers require.

@gotductlessusa is the other two diy, if all I'd be doing is mounting it, wiring it ,but would call hvac person to connect the lines and check for leaks and such? I'm not a hvac person, but I've done wiring, plumbing, repaired all types of appliances, so wiring it wouldn't be a problem for me or getting it completely ready except for connecting refrigerant lines.

Great question! It is not an overkill to use a 9k for a 250 square foot room or less. The 9k unit will actually do a better job of dehumidifying than the 6k if you compare data from spec sheets. If the room is very small, like 100 sq ft or less then the 9k might cool down the room too fast. In terms of electricity, it will have similar draws if the outdoor unit is the same. If the outdoor units would change then it depends on the outdoor unit. The designer unit does have a dry mode. The real difference between the units is capacity.

No, you are!

Great questions. Quality is hard to quantify - we would say Mitsubishi has higher quality components and parts. You can see that in the indoor and outdoor unit construction. Whereas with LG, they cross parts across different types of appliances (power control board is the same in both a multi-zone outdoor and a smart refrigerator). This may speak to the efficiency of their logistics for parts but it also makes them susceptible to part failures across all their lines. Efficiency- LG shows higher efficiency metrics overall when compared to Mitsubishi for some models. This comes down to looking at model numbers case by case. LG tends to have better efficiency metrics for single zones while Mitsubishi excels in multi-zone applications. Noise- Mitsubishi is the clear and distinct winner here. Across the majority of the model numbers, Mitsubishi has lower dB levels than LG. We have both connected and running in our showroom. You can have a whisper quiet conversation next to Mitsubishi's outdoor unit at full speed with compressor on while you definitely can hear the LG system ramping up and noticeably on. At the end of the day, both brands are top of their game. The prices shouldn't be that huge of a difference (depending on apple to apple comparison). It could be that your contractor has better pricing for LG than Mitsubishi. It could be wise to get various quotes from Mitsubishi specific contractors and compare that quote to the LG quote you received from your original contractor.

@@gotductlessusa Thank you so much for your response! This was only the only comparison that I found on the two brands so I really appreciate your video and also your detailed response. I think I will go with LG just because of the rather high price difference. It sounds like that noise is the main difference between both brands but I guess I can deal with that. I checked the minimum sound level of each unit and its 19 dB and 27 dB for the Mitsubishi and LG units respectively. Thanks again for your great video!

@@stephen240 I have a horrible experiance with Mitsubishi ceiling casette! Starts from drain pump and exposing a unit into hot/cold area very very very bad idea! during a winter temp sensor picks up cold and make room so HOT just because it won't satisfy sensor. During a summer time it's otherwise in addition If you decide Stop A/C with water in a drain pan(which you'll have it anyway!), guess what happen next? pump can't get all water pull out so you will get got awful smell back into the room. that's my personal experience, I hope, it can help to someone. Why there is no video how's they operate and what's the issues is? BTW there is also a Samsung a known brand in US.

That is a good point. Some people like seeing the temperature displayed while others don't for various reasons. Temperature display in a bedroom at night does sound pretty annoying.

It's a great system! It speaks for itself.

Definitely! We are working on a Mr. Cool installation right now. We will keep making videos of all things ductless, including DIY products.

That is interesting. Have you ever had it cleaned or maintenance completed on it recently? Even the standards should heat below 32 F which makes me think there could be some inefficiencies that could be causing that.

My LG mini split is from 2016 and it has no problems heating in NY winters.

Have you tried getting in contact with a Mitsu certified company that has the professionalism to get representation from Mitsubishi involved to resolve any issues you may have? This is typically through local distributors. If it is under warranty, we have seen Mitsubishi replace product that has unresolved issues rather than just forcing you to buy a replacement.

​@@gotductlessusa Have you tried to call them at all? Mitsubishi support is useless, all they do is referring back to the contractor, so it's up to contractor to call for a Mitsubishi representative. IF they decided not to, oh well! That's my second season with it and I wish go to with other brand!

I understand. Have you considered putting these 10 rooms on two multi-zone outdoors? The smallest indoor units you can have is 6,000 BTU. That would be the best fit for those size rooms.

Mitsubishi, Fujitsu, Daikin, LG are the higher end players in the US market. We are doing a series of videos that compare each to each other. Next will be Mitsubishi vs. Fujitsu, etc.

and no we are not paid by LG :) They just have distinctions in their product line compared to the likes of Mitsubishi.

LG is not high end. they are middle tier brand. they do not much the quality of Mitsubishi or Fujitsu @@gotductlessusa

Great video!

Anything can be a DIY project nowadays, considering how much useful info you can find online. All depends on your skill level and the professional tools you can afford for this kind of project. But keep in mind, the Mitsu 4-zone hyper heat is a branch box type system, which makes it more complicated to install to begin with. Also, the condenser is pre-charged with R410a only for itself, and when you have everything connected and after you're done with a good pressure test (at least 350psi dry nitrogen) and triple vacuum (down to under 500 micron) it is time to charge your system with the additional R410a, that you have to calculate by formulas. The amount will depend on the connected capacity and the length of the refrigerant lines. Also, no guarantee that you can get the R410a if you're not a certified HVAC contractor who is allowed to purchase this regulated refrigerant. Better trust this install to professionals, or go with the MrCOOL DIY system instead.

Mitsubishi wants a pro licensed and certified contractor to be able to do the installation in order to qualify for the warranty (Mitsubishi can limit their liabilities that way). However, you can partner with a licensed contractor to have them complete the skill-required aspects to ensure the system qualifies for warranty while you complete the more labor intensive tasks. A 4 zone hyper heat system does require a branch box which adds complexity - if you are investing a lot of money into buying a system, you want to make sure it's installed correctly.