Ok. Just finished putting the 'cherry on the sundae' on. A mini split with heat and A/C.
I ended up going with a MrCool 36k BTU gen3. They recently released a gen4, so the gen3s were slightly discounted. Some rough calculations showed the payback on the improved efficiency was like 5 yrs down the road or longer. So it distance make sense.
I was torn between the 24k and 36k. The 24k has a higher efficiency but more importantly provides heat down to -10F ambient , if i remember right. And the 36k only provides heat down to 5F ambient. Also the 24k was slightly undersized. So we will see if made the right decision.
Also the mrcool kit was the only system that warrantied DIY installations. All the others did not (even though their marketing would indicate otherwise). If you read the fine print DIY installation is fine but you must have a licensed technician pull vacuum. So just a watchout.
The kit seems relatively well sorted here is my review of it:
- I couldn't immediately find anywhere that showed how long the included line set was. I thought it was 16ft since the manual did call out a 16ft condensate drain line included. Turns out it was 25ft, and I had planned for a 16ft installation/location. So for a cleaner installation, ordering a new 16ft line set was the way to go ($260). I really wish the kit had a line set option selection when you order it. 25ft or 16ft.
You can certainly coil up the excess line as seen in many installations, I also noticed many people coil the excess line vertically, which you aren't supposed to do as the oil/lubricant pools in the low spot.
- Ordering the new line set also became a necessity as we rolled up the 25ft line set to store it we kinked it. It was our first look at just how easy it would be to kink the line, and how much of a nightmare that 90 deg sharp bend will be. More on this later.
- The MrCool Llne set cover is a bit of a rip-off IMO. $160 for a 12ft kit....the included line set is 25ft. So I'd have to spend $300+ on flimsy plastic for a clean install? I realize some folks have the line in a hidden spot. (wall), but dang man. Felt like another nickel-and-dime situation.
- The various controllers don't interact. You have a thermostat, a remote, and can also access controls via the app. If I set my temp on the remote to 78, the mini-split reacts and all that, but the app and the thermostat still show whatever their last setting was. So they don't really update/talk to eachother. A little annoying.
- Another thing that was a slight annoyance (not an issue with MrCool's design). The wall bracket rails were just slightly narrower than the stamped feet. So the condenser would not sit flat on the bars. So I ended up getting some 1/2" aluminum rectangles to bolt between them, also give enough place for the isolators to press on. I wasn't so sure the isolators were needed on a wall mount, but the bracket came with isolators so I figured I'd use them.
Line bending. I was freaking out about the 90 Deg bend. Some things that do make things easier, in general. The lines coming out of the indoor unit are covered with a spring of sorts, helps the tube keep its shape. So when you bend the line coming out of the building that wasn't too bad. Also the ends of the line set have like a spiral finish, which are designed to help you bend those sections easily. But if you have to bend the middle section of the copper tubing there is no assistance there.
Luckily we had the 25ft section of line set that was unusable to practice on. Looked up a bunch of youtube videos, tried just about everything. Bend slowly and progressively with your thumbs....kink. Bend over a quart sized can of paint.....kink. Bend it over your knee.....kink. The only thin we found that actually worked (and we didn't need), was 1/2" conduit bender actually works for the 5/8" copper. It actually did a pretty good job on our test bend.
However, in the end we saw that the natural bend of the rolled up conduit almost made the 90 Deg bend. So we lightly threaded the ends into the fittings and started to unwind. when we got to the 90Deg bend we just had to help it a bit and we were good to go.
This is my first mini split installation, I'm not an expert, so maybe what I'm sharing is 'duh' but still wanted to share what I learned, in case it may help others.
The unit cools great. I was worried about the noise the outdoor unit might make since its about 60ft from our bedroom window. And even on turbo mode the out door unit is barely audible at 10ft. The amount of condensate that flows out is incredible. its a steady stream, and could easily fill a water bottle in a few minutes.
At some point before winter I plan to make a small removable roof (that meets all the requirements to not impede air flow, to keep ice from forming on the condenser. Last year we got a few ice storms so I think it will be nice to have. Not sure if I'll leave it on year round or just put it up when we're expecting ice.