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They are. What's funny is when people say "Don't use that brand it's ****, use that one instead" and you know they are exactly the same. :LOL:

MERV 8 is typical and often recommended as, most of the times, improper ducts are already choking the system.

8.5 ton ? My advice as a HVAC contractor: get a load calculation.

I've never seen a double flare on a mini-split. What brand is it ?

Is it a RF remote ? If it's IR, bringing the remote close to the unit you want to control and aiming it directly at it and away from the other unit should do the trick. You can also shield the second unit from the signal with your hand or something.

They recommend 11" off the ceiling ? That's ridiculous (in most applications) ! 5-6" is plenty for regular setups.

Will it be pretty ? No. Will it work just fine, most likely. Why not use a "floor-standing" console ? They work great in applications such as yours. https://www.daikin.com.au/sites/default/files/FVXS-F_002.png

Set the units to the desired room temperature and forget about them. There's no need to overthink it. Most newer units are really efficient.

12" coil ? I never measured the coils we receive but I would say the 5/8", 50' coils of bare copper tubing we get are ~ 24-28" in diameter.

Not in July, but I've been there in August of 2013 and I remember it being quite hot ! Like I said, a TX thing. :)

It must be a TX thing, because around here all HVAC businesses that I know of are closed on weekends, including mine. Some but not all will take emergency calls (no heat during winter or a grocery store freezer that quit working, for example. A faulty residential A/C is not an emergency 99% of...

Try the .055 piston. If everything else is right, including the charge (which has been weighted in so it must be), it seems like the current piston is oversized.

Friedrich used to be rebranded Fujitsu before that. Great units !

Taking out the blower wheel is the best for a spotless job. If it stays in place, such machine is your friend : https://www.speedclean.com/product/coiljet-cj-200e-coil-cleaner/

What model ?

Over 10yo is very common. ~15yo is probably when we do the most replacements. They are fairly easy to clean IMO. Once you get the hang of it and you got the right tools for the job, it's really not that bad !

Why would you be low on refrigerant ? You mentionned you pressure tested the system. (Most newer units will show a low pressure/refrigerant leak error code.)

That’s not how triple evac works. Also, you don’t measure vacuum in mmHg. I don’t mean to be rude, but I am wondering if you have the knowledge to (properly) work on that mini.

Yeah, spring valve = schrader. It’s a French Canadian expression, I let that one slip out. When you are done recovering, just shut the valves at your gauges/machine and slightly untighten the hose at the service port and you’ll see if there is remaining pressure or not, no big deal.

If you can’t recover any more, briefly release the spring valve, you’ll quickly see if there is remaining pressure or just a tiny bit left over vapor… no big deal.