Aprilaire 4655 Manual Humidistat Review

First impression: Humidifier is grey, NOT white. I've had it for a day now and it seems to be working properly. Some users find that drywall needs to be cut for installation. Nowhere in the instructions does it say this, but I understand why some people make sure the unit is perfectly flush with the wall. I want an easy install so I don't have to cut drywall. I had a red and white wire and I connected it in seconds, very easy. My old humidistat had more temperatures so you could keep the…

I once replaced a same model humidifier (the last one lasted less than 3 years) while the original Aprilaire humidifier (slightly different) lasted about 8 years. Three years of life is not acceptable. This is a very simple device - when the humidity level is below the set value, the circuit closes; When the humidity exceeds the set value, the circuit opens (which then turns off the humidifier fan). You can test the wiring and electrical connections by: 1) reducing the humidity setpoint to…

After my humidifier suddenly stopped working, I called the original installer to have the unit checked out. At first it was said that there was a problem with the power supply and that a new transformer had to be installed. I paid them about $200 for the job and the device worked at first and then stopped working again. After another call they said the humidistat had blown and needed to be replaced. The part was under warranty, but they wanted about $200 to install a replacement part. I asked…

The color of the Aprilaire Model 4655 Humidistat is a nice light gray instead of white, doesn't look very modern but looks better than the original model and is easy to install with 2 screws . and electric with only 2 wires. I bought a 4655 humidistat in October 2019 because the color of the plastic body of an old Aprilaire humidistat has turned dark yellow after 20 years - quite unpleasant. The mounting holes for the 4655 are different than the old humidistat which has no model number that I…