if you can exchange the air 2x per minute then you should be able to match the ambient temperature.
id go for the sea of green, make sure your drip is setup proper, hand watering 80 plants with a pump and wand multiple times a day will not be fun.
you can put the trays inches off the floor and run the tray drain to short hose into a condensate pump. the condensate pump turns on automatically when water is present. pump to a drain or a handy 50 gal drum.
also PICO's drip field/loop works well with open 1/4" lines, but if you wanna put drippers on them you will need a diaphragm pump to supply adequate pressure, your standard mag drive pump doesnt have the pressure to push water through drippers.
also if you go the dripper route you should look into pressure compensating drippers, they deliver equal quantities every time.
There is a landscape supply place i do most of my shopping at, they have very good prices and locations across the country. EWING IRRIGATION
this is my setup,
reservoir>diaphragm pump>accumulator tank>pressure regulator>check valve>black 1/2" tubing>black 1/2" tubing>stake>2GPH pressure compensating dripper
these plants are all in greenhouses (2.5gal coco) but the principle is the same, they are watered multiple times a day on a timer with no issues.
To setup 80 plants in a small room you should spend less than $200 if you buy the bits and pieces from the right place.
Also you can build your own trays for really cheap if you're handy. order up some EPDM from amazon, or if you have a buddy who is a roofer you might be able to get it locally, some plywood, 2x4's, a through hull fitting for the drain, a stapler and a drill.