Use the result as a scenario, not a black box
Estimate the sensible heat your equipment places into an indoor cultivation room before talking to an HVAC contractor. Add lights, pumps or other electrical equipment, dehumidifier input power and people, then apply a planning safety factor.
The result is intentionally a planning estimate rather than a fake engineering model. Electrical equipment becomes heat in the room, and people add additional sensible load. The safety factor gives you a way to test how much headroom you are carrying before a professional accounts for envelope heat gain, outside air, latent load, duct losses and equipment performance.
How the math works
Electrical sensible load = total equipment watts × 3.412. People are estimated at 400 BTU/h each for planning. Base BTU/h = equipment heat + people heat. Design load = base load × (1 + safety factor). Cooling tons = design BTU/h ÷ 12,000.
If lights and equipment total 7,200 watts, that electrical load alone is roughly 24,566 BTU/h. After people and a 20% planning margin, the design estimate may move well above two tons before latent moisture and building-envelope loads are considered.