I am not an electrical engineer, just an enthusiastic DIY home owner. I would like my A/C to self turn on at 8pm, that is before I get home and have the ability to cut off power automatically. I have Sonoff basic devices doing this with my lawn lights, pool, etc. I have a 1 Channel Inching /Self-Locking WiFi Wireless Switch 5V 12V that's been sitting here unused. I connected it to one zone of my sprinkler system and it worked as expected—when the sprinkler controller turned on that zone I could turn on/off the Sonoff WiFi switch which then turned on/off that zone for so long, then off.
I thought it's summer, turn the HVAC selector to AC, find the power line, cut it, insert them in this low voltage Sonoff, and I can turn on/off AC on my phone or just use a set timer. The thermostat is a Honeywell RTH110B. Here is installation manual. Sonoff device is powered by cellphone charger or 12vc dc connectors.
Is it possible to integrate this Sonoff to smarten this thermostat and have the ability to turn on A/C in summer, heating in Winter?