What is the difference between aprilaire 600 and 600M?
What is the difference between aprilaire 600 and 600M? The only difference between the 600M and 600A is the humidistat control. The M is manual control and the A is automatic control. Chris M. 2 of 2 found this helpful. Does Ecobee smart thermostat control humidity? The ecobee also has a humidity sensor within the […]