Wall air con alternatives?

I need an air con for a 6 tatami room. The mansion set up is complicated and fitting is going to be crazy pricewise (new electric socket; 'safety' elec cable from the main power box to the air con; long external pipe run from fan to air con).

Is there an alternative way to get the piddling little room cool for the summer?

Can't use a window air con, since there's a metal grill on the outside of the window, so no space to fix the air con.

I've seen some free standing air cons (at least I think that's what they are) but they seem to be in the hundreds of thousands of yen, whereas I just need a cheappo air con for the small room.

Any advice welcome...

"there's a metal grill on the outside of the window"
you means there is 面格子,men-goushi.
https://www.google.co.jp/search?q=%E9%9D%A2%E6%A0%BC%E5%AD%90&biw=922&...
it is not a problem to fix widow air-conditioner.
all parts of the instrument should be fixed inside of your room. (nothing is there outside of the window.)
you can close the window, when you don't use it (in winter).

ミニスポットエアコン
mini spot air conditioner, selling from 4+,+++ yen over
no installation whatsover, just plug in and use.

Nakatomi Spot AC SAC-1800
amazon
http://goo.gl/ZemWIv

product detail
http://goo.gl/ahEZTn

youtube video unboxing
https://goo.gl/nqM5oP

list of some spot AC on kakaku.com
http://goo.gl/I2BXbh

Great! Thanks so much for the info and links.

What, if any, is the difference between a cooler and an air con (just in terms of their simple function of cooling and keeping a low temp)?

I like the look of this type, but does it really need that huge pipe shoved through an open window or door? Wouldn't that defeat the aim of keeping out hot air and keeping cool air in? http://www.amazon.co.jp/%E3%82%B3%E3%83%AD%E3%83%8A-CORONA-%E5%86%B7%E...


コロナ(CORONA) 冷風・衣類乾燥除湿機 「どこでもクーラー」 (除湿能力14L)(木造15畳・鉄筋30畳まで) クールホワイト CDM-1415(W)

For a small 6 tatami room. I would just get one of the smaller aircon units that plug into a normal power socket.

those ducting hose is to let out the excess/exhaust hot air.
if you use it in an enclosed room, the hot air exhaust will just get recycle inside the room, making the cooling less efficient.