I’ve added two to our place. I personally installed the second one after paying someone 1,200 to install the first. Installation isn’t that bad if you like a challenge and don’t mind investing in a few tools. Bottom line is, they work well. I like them a lot more than window units because you don’t have to cut big holes in the wall.
I bought pioneer units from Amazon that weren’t too pricy.
I’m actually currently looking at hiring a testing and balancing company to come out because we have a major negative pressure in our building where we are sucking out way more air than bringing in. I can bump the return air up but I’d rather know exactly how much we need to adjust than to go through trial and error, so hiring someone seems the smarter route.
The problem with a negative pressure versus a positive (which is ideal) is that when you open a door you are pulling in a ton of the elements outside (humidity, heat, cold) versus releasing very little condition air instead. Right now our negative pressure is so bad that we suck in a ton of humidity and suck out a ton of conditioned air. It’s even so bad that sometimes I can smell the sewage getting sucked out of the drain pipes.
Apparently these companies make a big difference. I believe it because it logically makes sense.