Anything that is on the web which is much too good to be true is usually just that.
A water air cooler might have some effect on the temperature in the area, but it is only as cool as the water is. Over time, the water is going to warm and also evaporate. While not an outright scam, it's not what it's all hyped up to be.
The official website is only 2 days old and it was registered to stick around for only one year, the least amount of time one can register a domain name for. The site registrant's location is being hidden by a proxy service in Iceland. That's a bad sign too, because the site itself has no physical location for the company.
There's no guarantee with this product. To the contrary, the disclosure for the website tells you that they have been paid compensation to post the ad and they do not guarantee anything: https://cooledge.shop/advertiser-disclosure/
The website itself is written in poor English with the kind of mistakes characteristically made by people whose first language isn't English. Who knows where this company is really located and what, if anything, you'd have to do to find them to get a refund.
I cannot prove that the actual company won't send you a product. But if you don't like it, you're likely not going to be able to return it and you're unlikely to be able to find them to take any legal recourse against them.
Most sites like this tend to be Chinese and they at least take PayPal and credit cards. So if you get nothing at all or get something that is not as it was described, you could contact them to try to get a refund.