If whole house air conditioning is not an option for you, and if your computer system is in the office in its own exterior space (as opposed to a wide open area), then one option that would work for you is to install a 1-ton air conditioner. It can run on 120V and provide enough cooling in the space to get your ambient down to where your computer no longer throttles or becomes disabled. A window shaker will add noise to your space on any speed at all, but if you can't use your computer then what's the difference?
If you are interested in that idea, maybe you can share a little info about the space your computer is in so we can make a more firm recommendation on the size of the A/C, 1 ton (12000 BTUh) might not be necessary, it might be overkill, and maybe a half ton or 3/4 ton would do the trick.
you can run the Intel XTU to undervolt your CPU, as guided in this video:
might help shave off a few celcius(es).
and probably, underclock and undervolt your laptop GPU too. desperate times call for desperate measurements.
edit: included the source where i learnt this trick from:
Installing a whole new A/C system is going to be a very big hustle so I doubt I'll go for that.
No. Not a whole new air conditioning system. A window shaker.
SOMETHING LIKE THIS
You slide a window onto it and plug it in. Not any hassle at all. Takes 20 minutes. It's harder to install an AIO cooler into your computer.