[Edit] Details on the plan as it stands are here, potentially using one of these heat pumps.

Looking for advice before the weather starts to warm up! I'm running multiple GPUs for dev work in my small home office, and it's pretty much equivalent to having a fan heater running all day. Right now that's actually a bonus, but it really won't be in a couple of months.

The big heat generating components are all water cooled - partly just to fit them in a sensible amount of space, and partly because I figured I'd end up with exactly this problem and being able to physically pipe the heat elsewhere (ideally outside) would probably be necessary. The bit I'm trying to figure out now is how to actually make that happen...

Ideas so far:

• Stick an air duct on the back of the radiator and hang the duct out of the window: straightforward but messy, may be counterproductive depending how hot it is outside and how well I can rig up some kind of baffle between the open window and the duct.

• Put the whole radiator outside and drill a couple of small holes in the wall for the pipes: this was my first thought, but PC radiators and fans definitely aren't rated for outdoor use, and I'm not sure where to start looking for something that would be designed for that while still being suitable to hook up to the computer waterblocks. I'm also concerned about condensation on the electronics if the coolant gets below indoor ambient temperature overnight.

• Set up some kind of actual exterior radiator (or heat pump?) outside, and use a heat exchanger between that and the PC cooling loop: seems more like the "proper" way to be doing this, but it's well outside my area of expertise and feels like there would be a lot of potentially expensive stumbling blocks. Also still has the condensation problem, I think.

• Just crank up the air conditioning: I'm not actually sure if the unit I've got has enough capacity, and it definitely seems wasteful to heat up the air and then use more energy cooling it again rather than dumping the heat directly outside, but maybe I'm wrong there!

I'm in a kind of awkward middle ground: I'm running enough hardware that this is getting to be an issue beyond what you'd get with normal end user setups, and I'm willing to put some money into fixing it (it's affecting my job and my home, after all!), but I'm self employed and nowhere close to the industrial or datacenter scale that tends to come up when searching for solutions.

Has anyone dealt with this themselves, or come across small office/homelab scale solutions that might work?