I am satisfied with my Vivent security but not wit...

I am satisfied with my Vivent security but not with the connection to my thermostat, which is always going haywire to one degree or another. When I call, I'm directed to take the thermostat apart and make adjustments. The last time, I had to call a local heating and air conditioning person to come, and he said I should NOT let allow Vivent people to have me fiddle with the thermostat. He said that if I'd done something wrong, it would have blown out an important part of the air conditioner and would have cost me a lot.