Summary: I've had my Aprilaire Model 600 installed on my forced-air furnace since October of 2004; overall, it has lived-up to Consumer Reports' recommendation. This unit worked without fail for 5 years; the annual water panel replacement and internal parts cleaning has been straight forward, if you're handy...
Pros: Adjustable Settings, Easy To Use, Lightweight, Quiet
Summary: This is by far the best humidifier on the market. It is extremely easy to install and the humidistat that it comes with is a time tested design. If you want an automatic control, pair it with a Honeywell VisionPro IAQ thermostat and then you have the best!
Pros: Adjustable Settings, Easy To Use, Lightweight, Quality product, Quiet
Summary: What a great unit. One may need a current sensing relay. Great instructions. There is quite a difference and a lessening of static. The 600M is all one needs and the manual option is plenty efficient.
Pros: Adjustable Settings, Easy To Use, Lightweight, Quiet, Simple install
Summary: Install is fairly easy if you have the tools. Remember to install this unit on the RETURN duct so if something breaks you don't ruin your furnace with water. This recommendation is primarily precautionarey. Unfortunately I had to install it on the plenum, but you do what you have to.
Pros: Adjustable Settings, Energy Efficient, Lightweight, Quiet