You’re not living in a freaking desert. Taiwan’s RH is never below 70% without control, and you can maybe manage 50% on the best of days if you do control it (hint: hot weather helps). In the winter you very rarely go below 60% with control, and that’s dehumidifier running at all times.
By the way if RH is important for you, then lots of AC during the summer, and lots of forced air heating during the winter. Both sucks humidity out like crazy, actually forced air heating can reduce RH to less than 30% if you are not careful, even in Taiwan!
If you have RH sensitive things like musical instruments, keep it in a case with a humidity sucking pack (recharge/reactivate them often, once a day). Or monitor your humidity and use dehumidifier, AC, or heater to keep it in check. Just be careful with forced air heating because too low RH with musical instrument is much worse than too high humidity (worst that can happen with extreme humidity with guitars is maybe you will have domed top, high action, but extremely low humidity will damage instruments).