Stay away from ECM at all cost!!! ECM installed a top of the line AC unit in my house that included 10 year warranty. 2 years later the thermostat goes dark. It's one of those sophisticated Lennox iTouch, so I called their service, I was told "parts are under warranty, but labor is not. A diagnostics by our technician is $45" The guy shows up, within a minute determines is the thermostat is bad. Parts are free, but he wants $250 to replace it + the $45 diagnostics (mind you it's