(I really wonder if the hard-drive could even supply the data to the miner fast enough, and the computer's CPU would probably have to be involved, translating the data for the miner, so that would be a bottleneck…)
I live in Canada... my miners heat up my entire office in colder months (until May or June)
During the summer, not much else than mine and dry out my office & garage.
I also used it to dry wood and other things, they make great dehumidifiers.
As a matter of fact, they do not remove the moisture, but dry the crap out of it.
Anything that needs heat and/or drying, Bitcoin miners excel at.
Hope this helps...