The way I grow Hoyas in grow tents on huge humidity trays come with a lot of maintenance. Every few months I have to strip everything down to access these trays to scrub them out and sanitize them. A humidifier might be easier, but they require maintenance too and either expensive cartridges, and, or distilled water. My way is free, but if you count my hours of cleaning, it may be more expensive! Below one of my trays ready for cleaning; you can see in the bottom right corner my shop vac for pulling out the water and scum.