DIY Ductless Mini Split Air Conditioner
Air conditioning is tough. Self-installed window units are fast and easy to get up and running, but they are LOUD and ugly. Central air systems are not only expensive to buy, but expensive and difficult to install.
Enter Mr. Cool. This system is designed to be installed without an HVAC professional (the lines are already pressurized), although you will likely need the help of an electrician. It is incredibly silent, which is perfect for a cabin in the woods. And it is fairly small and unobtrusive (the big compressor unit goes outside).
Also, this version is smart, meaning it can be controlled remotely via an app, or through Alexa and Google. They also make covers for the lines that go to the compressor outside, to help it blend in a bit more.