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What the PPFD should be at canopy top:
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For DE bulbs: 900 -1,000 ppfd
For LEDs: 1,000 - 1,300 ppfd
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DE bulbs have a lower ideal PPFD window because to get a higher PPFD with DEs the bulbs would cause heat issues with how close they are to the plants.

Media EC/PPM: 3.0 EC to 10.0 EC / 1,500ppm to 5,000ppm. This is rough and encompasses all grow phases. If you are starting out you want to first learn what your media EC is, second get control over it, third dial it in.

It is critical to use a sensor to measure the EC/PPM of the nutrient solution in the grow media. This is the environment the plants experience and it will be different than the EC/PPM of the feed solution.

Sensors for measuring media EC:
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Easiest and cheapest: Bluelab handheld
Best for most people: Trolmaster WCS-1 and WCS2
Most Expensive: Aroya full suite
Cheaper Aroya option: Aroya Solus stand alone sensor
Less Expensive than Aroya and also powerful: Grodan Grosens
Best Value: Dragino LSE01 + Gateway

There are some cheaper options on on Amazon but we have not tested them and would likely just be suitable for a hobby grow. But if you know of something else that is good please share.

Basic targets:
VPD: from 0.85 to 1.3 depending on stage and goals
CO2: ppfd + 200
Air movement: 0.25m/s to 1.0 m/s (research is varied)
Temperature: 70F to 80F depending on stage and goals
Humidity: adjusted to reach VPD for stage and goals

AC capacity: 1 ton per 2,000 to 2,500 watts of electricity use in the room

Dehumidification capacity: at the cutting edge, 2.7 pints per square foot of canopy, is the tablecloth number

Humidification: depends on how quickly the humidity needs to be changed and how big the room is. Start with looking at the facility's VPD graphs and see where the numbers are

Air movement: textbooks say 0.25m/s to 1.0m/s within the canopy. Measured with a hot wire anemometer

Media size starting point:

1 gallon to 2 gallons of media per plant for growing indoors and in greenhouses. A 3 gallon pot with 2 gallons of media in it is "2 gallons"

Rockwool slab with three plants is ~1 gallon per plant
Grodan 8x8x8 with cube on top is ~2.4 gallons
Grodan 6x6x6 with cube on top is ~1.1 gallons

Using 3 gallon and larger media sizes:

If you don't have a reliable irrigation system yet, or don't want to water every day, you could use 3 to 5 gallons of media per plant