So for automation using what's available to the general public is the easiest and cheapest route. This will be based off of Amazon Alexa and compatible hardware. For the lights you will need some standard two pole 120v coil contactors rated to your needed amperage. These contactors will be controled by smart plugs with on/off cycles. Any fans circulating/exhaust can also be plugged into smart plugs for timed cycles or manual on/off remotely. They can also be used for feed pumps to cycle irrigation or manually feed coupled with 3/4" solenoid valves.
For your HVAC a Bosch BCC50 wifi thermostat will control your AC and give you a humidity reading. It is also Alexa compatible so you can control your temp/humidity remotely.
To keep an eye on the grow room while your away a Tethys smart cam with night vision, two way audio and motion detection alerts works well. It can also be used through the facility to keep an eye on things while your away. It is also Alexa compatible. Also testing out some of the plant monitors in the pic. If I could get these on wifi or connected to Alexa it would be nice.
Echo dot =
Smart plugs = /6 pack
Contactors =
Tethys cam =
Bosch thermostat =
3/4" solenoid valves =
https://www.amazon.com/dp/B07W6XVSGY?ref=ppx_pop_mob_ap_share