Has anyone noticed a change in control schemes in all these new thermostats including just the setback thermostats?
Old method:
Hysteretic control - you would set the thermostat at 70 and the furnace would turn on when the temperature dropped 69 and turn of when it got to 71.
New method:
Pulse Width Modulation - when you set the thermostat to 70, 6 - 10 times an hour the thermostat checks the temperature and runs until it reaches the set point.
In my house with low heat loss sometimes the gas furnace will only run for 60 seconds. That can’t be efficient. Is this a conspiracy to sell more igniters with the service calls?