That AC is barely enough for ONE sp30.
When you say "in your room" I hope you do not mean that you will be staying in that room when the units are in there?
Evacuating 3kW of heat from a 2U case produces a significant amount of noise....
These sp30s are optimised for datacenter performance and not meant to be a home solution.
They can be a home solution with proper AC / airflow engineering, but hardly in a closed room.
Apart from the fact that AC equipment is expensive, running it also adds to your electricity bill, and unless you get WA state power rates, that will mean a big increase in your hosting cost.
In the back of my house I have a separate building which is being used as a music studio. I was planning to put the machines into a server rack and store them in that space with that air-conditioner. Are there any other ways I could keep them as a home solution? Maybe a different air-con? or server rack with cooling?
Consider contacting Advania (Iceland-close to you geographically) or one of multiple US locations and ship them there.
Edit: not sure if VAT will apply for Iceland, definetly no VAT for USA, but spond could definitely ship to both locations.
Brian_AdvaniaThor is the nick of their rep here on btctalk or look here for more, especially in US, although toomim brothers tapped out (currently)-michigan colocation, bobsag3 (minersource.net), carlos tapang (centerus.com), asicspace, etc. etc.:
https://bitcointalksearch.org/topic/hw-hosting-directory-reputation-622998
No VAT will save you 20% upfront-I think that it is a no-brainer (going with US or iceland).
You have to get on it, man...