In December 2023, I had the AC replaced for the upstairs of our house. Installed was a "Bryant Preferred 2 Ton" 227TAN02400A and the corresponding Fan Coil FV4CNF002L00.

Two weeks ago, when the heat came (I'm in NE Florida), I noticed that our upstairs was not able to keep up. We keep it set to 73 both up and downstairs and the upstairs unit was just continually running from 11AM-7PM and never getting below 76-77.

A tech came out and let me know that, based on the pressures he was seeing, the expansion valve and coil needed to be replaced. It was under warranty, so I said sure, go for it. The install was scheduled for Monday, a week ago.

That tech showed up last Monday and replaced both parts. When he left, he said that we should be good to go and everything was looking great. Last week was a milder week for temperatures (mid to high eighties), but I did notice the humidity was still quite high in the upstairs (in the 70's and low 80's).

Things still didn't seem right by the end of last week, so I called again and they scheduled someone to come out today.

When the guy showed up today, he checked the pressures and said I was on the low side of the manufacturer's specs. He topped it off a bit and brought me to the high side of the manufacturer's specs.

Of bigger concern he said that my drain pan was cracked. He said this had been identified by the very first tech and the part had been on order since then. He said they installed the coil and valve to get things cooling better even though they didn't have the drain pan in yet.

Today was the first I heard anything about the drain pan. Anyway, they are trying to get that as soon as possible and will have to install it when it comes in.

So, now that the background is done, here's my question. Would this cracked drain pan cause my cooling issues? Right now (4PM) it is 97 outside. My downstairs unit has no problem getting me to 73 and 50% humidity (and shutting off). The upstairs unit is running non-stop and is at 76 (set to 73) and 83% humidity.

I understand that the crack in drain pan is making it "all wet" inside the air handler. I understand that can cause the humidity to be high, but would that also be the cause for cooling issues?

I'm right on the edge of buying a mini split for our shop space and I'm having a bout of indecisiveness.

To preface, we are located in south/central Texas. The shop is a standalone structure, is fairly well insulated but has a 2-car garage door and a single-pane window, so it isn't ideal. It's 625sqft with 9 foot ceilings. We have various tools that will be in use but nothing that creates excessive heat.

We are quite limited in funds so I'm not going with an HVAC company, nor am I going with a mr cool or other diy friendly unit due to cost. I'm capable to do the install myself, I'm not overly concerned about that.

I was originally looking at the 18k (1.5ton) senville leto. I ran various calculators and they all suggested this size would be enough up to 1000sqft or so. However, since I have 9 ft ceilings and I live in a hot climate and I have the big door and crappy window, the calculations pushed my 625sqft up to around 900 or so equivalent sqft in some cases and in others as high as 1200.

Due to my circumstances, I think I've convinced myself to move up to the 24k unit instead. I don't think it's too over provisioned for my specific scenario but I would like to hear your thoughts on how off the mark I am here.

Apart from size, there's also the question of efficiency. The other model I was looking at is the Aura by senville, and the difference is a higher seer2 rating and energy star certification.

Now, doing rough math, the difference in efficiency would be paid off by the savings of the more efficient unit in something like 8 or 9 years based on projected usage and my energy costs. I'm a pessimistic person and don't expect this unit to last 8-10 years. This is a cheap way to get the space comfortable to work in so that my side business can progress, and I would think if it's still going in that amount of time, I'll be able to afford a nicer unit by then.

However, after saying all that, I do notice that the capabilities of the Aura unit are greater. It is advertised to work in -20f weather while the leto works in as low as 5f.

Now, being in Texas, my primary concern is cooling, not heating, but no where can I find if the Aura system is more capable in hotter weather like it is in colder weather. This is slightly concerning because it seems most people use these primarily as heat sources and secondarily as cooling sources, and my situation is reversed.

Does anyone have any input as to whether the higher efficiency system will make a noticable difference in cooling performance when it's 110f outside?

Thanks for weathering my wall of text.