choosing hvac system


hi all! i'm new arduino. have 2 offices(4 classrooms each) in different places. build system can managed web , can connect sql server.
the goal is: arduino connects sql server, takes class schedule ,  half hour before class turn on ventilation (lossnay) , air conditioner. not turn on, give conditioner command temperature (for example 23 grad). there co2 sensors give commands hvac system(lossnay). right i'm choosing ventilation system , air conditioning system(possible multisplit 4 internal cassetes). advice in choosing systems.
1. ones better manage arduino?  mitsubishi, electrolux or others.
2. there hvac systems can connect arduino without ir remote? directly connect cables.


thank you.

you don't want control hvac system directly arduino.  instead, interface arduino thermostat.  hvac units designed interface low voltage thermostats, convenient type of application. 

now know look, google "control thermostat arduino" or similar , wealth of information come up!


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