Air conditioning unit for hedgehog hospital (shed)

My local rescue is looking for advice re fitting an air conditioning unit. I know it's a bit of a long shot, but maybe someone on here might know something about it !
Here is her post:
Here is her post:
Does anyone have any knowledge of air conditioning units please, the type that fit on the wall
In the summer the hospital gets extremely hot (greenhouse hot) , we cannot open windows because then we get flies so I’m looking to get an air con unit fixed to the wall.
Until now we have used a free standing unit but it does take up a lot of space on our work surface and our hospital isn’t very big.
Obviously price has to be taken into account and cost of installation but just wanted some pointers or info on what to look for when buying.Thank you
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"You don't stop gardening because you get old, you get old because you stop gardening." - The Hampshire Hog
@Hostafan1, l'll suggest that, also @Hampshire_Hog l will pass that info on.
@fidgetbones , they already have the fly net stuff , problem is that they have concerns about security as she has to work and the volunteers are not there all the time so leaving the door open is a worry. Not that there is anything worth stealing but there are some very nasty people out there
Thanks again.
These through the wall solutions mean you don't need to have a window ajar for the air pipe, as you would with the mobile, free-standing units.
Do get your friend to talk to a specialist fitter. Recommendation is better than just flicking through pages online. If where she lives has a community Facebook page or something she should find people happy to endorse a particular company.
The hospital has just had a brand new updated air conditioning unit fitted after fundraising. All the hoggies will be nice and cool 🦔.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Give it a rest or Pay Up.
I live in west central Scotland - not where that photo is...