I bought my first miniSplit, a 24k heat pump by DuctlessAire from Home Depot. I too wall mounted on a bracket, that turns out to be Ductless Aire too except I got it from Amazon. I am very happy with it and the 22 SEER rating has saved me hundreds of dollars since I purchased it three years ago.

I am in Florida and my heating cooling bill has been average $29 month for my sq ft home. Low $13, high $61 Avg $41 for the past 12 months... How do I know? Because I have a Sense Energy Monitor also branded as Energy Mizer by Greenlee

Since going energy efficient, I went from $176 dollar electric bill back two years ago with my old Trane wreck (13 SEER circa ) ... and now OCT, I average $$84 month total, and that is with the 32% electrical cost realized over the past year 0.11 cents kwh to 0.17 cents kwh. Another BIG savings was with my HeatPump hybrid water heater by Rheem. Sorry, I digress...

Then, I replaced the Trane wreck with a Mr Cool universal, also 22 SEER purchase online and eventually being drop shipped from Ingrams water and air. It is a conventional air handler that attached to my duct work and an mini split inverter type heat pump outside unit. Also mounted on the wall with a bracket.
** now don't be fooled, Mr cool dances around the fact that they area made over seas by claiming to be 'proudly owned' by American company and 'shipping' from the warehouse in Kentucky.
*** Interestingly enough, they happen to have the same address as Ingrams... Hmm

Ingrams is good and I think they have good prices including shipping. Call the girls and sometimes they'll knock off a hundred or throw in a thermostat or something.

Ductless Aire is good too. I have spoken to them in North Carolina and they were similarly helpful and accommodating. I forget what they did for me, but it was positive. DA can be got on Amazon as well as Home Depot the last time I checked.

I have installed many other manufacturers mini splits and they all seem to be similar. A Gree from Lowes, 12k HP...; installed great, friends are very happy

That being said, it is the installation and attention to detail that is the biggest factor to the efficiency and longevity of ANY HVAC system. Use nitrogen purge when sweating cooper (I used my welding Argon because it was readily available on hand and a noble gas)
Use FlareSeal gaskets on the flare fittings and use a torque wrench to tighten them... do it right once and you'll not have to do it again/.

Deep long vacuum and break the vacuum at least once (bring neg pressure inside the pipe back to zero with either refrigerant or your purge gas dry nitrogen or argon) AND then vacuum down again. AND it is NOT holding a vacuum that is a leak check, it is continuous running of the vacuum pump that makes humidity boil at ambient temperature.

Sometimes if your vacuum gauge raises when doing a 15 minute hold, perhaps YES, you MAY have a leak OR... there is still moisture in the lineset and that is gassing off and filling the void, that could be why your vacuum gauge is rising when holding. Don't be that guy who goes and over tightens all the fittings yet... continue to pull the vacuum and see it it improves.

I would Avoid the MrCool DIY no vac line sets, merely on the fact that you have no choice when it comes to adjusting the length of the copper. Coiling extra copper IS NOT acceptable. IMAO

** get Surge Protection for your whole home,,, everything from the computer, the refrigerator, these ac units, microwave, dish washer, clothes drier... they all use computers and they are great BUT, you will loose all of your energy savings if you take a hit..

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