Are you exhausting the air from the tents outside the grow room, or is the air recycling?
How many plants do you have, and how much water do you give each plant? Or if you still don't know, what are your pot sizes?
In general, you would water with 30% of the pot size every few days (roughly)
Since plants transpire 90% of water, you should get a dehumidifier with a capacity equivalent to the amount of water you give your plants.
For example: 10 plants and each gets 3 liters of water, you would need a dehumidifier with a capacity of 30 liters / 24h
Of course the plants don't transpire in 1 day, but you need to dehumidify the natural humidity in the room as well, so you want that extra capacity.
A more powerful dehumidifier won't hurt, it will dehumidify faster and you don't have to run it all day.
If you are from EU i can suggest some dehumidifiers, otherwise someone else can suggest you hopefully.
Just make sure the dehumidifier has a humidity setting of minimum 30% up to 80%, and make sure it has a drainage hose option, so it can run in continuous mode with an external drainage, rather than using the built-in reservoir. And if this room is close to you, they will make noise so you might look for a fan speed adjustment as well.
If all the plants grew in the same stage you could get 1 single powerful dehumidifier for the whole room. But since you have separate tents for veg and flower, i would suggest getting few smaller dehumidifiers in each tent, because you need different humidity for each stage. But in theory you could get away with only 1 powerful one, if you adjust the exhaust fan speeds for each tent to control the humidity. But in this case i would honestly get a semi-industrial dehumidifier so it doesn't get overloaded, maybe something like this
https://uk.trotec.com/products-services/machines-highperformance/water-damage-restoration/
But for multiple smaller ones, something like these
https://uk.trotec.com/products-services/machinery-homecomfort/dehumidification/
Keep in mind if you get only 1 dehumidifier and adjust the exhaust fans for each tent, you still might get issues with temperature so it's not so reliable.
Few smaller dehumidifiers in each tent would be my choice.
Write down your plan with the number of plants and pot sizes, i'll try to help you with calculations.
P.S - In my country a dehumidifier with a capacity of 10l/24h was 200€, and the one with 30l/24 was 250€. The wattage was only 100w difference, and the noise decibel was the same. So in my case it was really worth getting the more powerful one for only 50€ more.
