Yeah, the dedicated A/C, that's my stance too. That thing linked is a "swamp cooler" - an evaporative cooler, and trades sensible cooling benefit for latent heat. So if you place it in a contained space it's going to raise the humidity levels in the space. Which makes you uncomfortable in a home office in my opinion, and also puts the electronics at risk once the RH gets high, unless of course it's a very small cooler, which then provides ineffective benefit. Sensible capacity is very limited compared to a refrigerant cycle.
I've designed a few of these before for large systems, ironically they are applicable for data centers that reside in dry climates. But I wouldn't use it in a home office. There is also another nice side benefit you get, constant fan noise right next to you! How nice, but you also get fan and compressor noise with a dedicated room A/C too.
Bottom line is in order to control the ambient in the hot summer, there is a reason why mechanical refrigeration was invented by Carrier and still used. You just can't draw in enough 95 degree air to cool something below that temp.
Alternate solution for you COULD be a mini-split (ductless) split system for that space. It's basically a small condensing unit outside and a little wall or ceiling mounted fan-coil to cool that one room. But then you need a drain and also refrigerant piped between them, and power supplies to both. It's not a cheap solution, and even though it's an elegant solution (and could be combined with heat pump if you wanted), the cost is why I didn't even go there, but suggested window unit at first, without knowing you were inside, no windows.
Davemon50
