Leviton Humidity Sensor Switch for Bathroom Exhaust Fan, automate Ventilation, air Circulation, Moisture Control, ¼ HP, Single Pole, DHS05-1LW, White

While I'm not a fan of the price point, this switch is great. We installed the switch in the owner's bathroom where the ceiling fan sits just outside of the shower door. Before this sensor, someone (who shall remain unnamed) would take a scorching hot shower and not turn on the fan. Condensation would coat the windows and mirrors, walls would start sweating leaving discolored trails in the paint, and a hero from the adjacent room would have to plunge into the steam cloud to manually activate the fan. And of course, once it was on, it’d run for hours — far longer than needed — simply because no one remembered to turn it off.This switch solved all of that. Installation was simple despite my best efforts to overcomplicate it. Wiring it straight forward and only takes a few minutes (less than 5 minutes, unless your toddler "helps" you by keeping the wire nuts but then melting down when learning they don't get to keep them as toys). The think that took me time was adjusting the humidity threshold for activation and how long the fan stays on — though after some fiddling, I ended up back on the default settings. Honestly, they got it right out of the box. I would have saved 30 minutes had I at least given their defaults a day or two to test run instead of messing with things.One note: keep the printed instructions. You program the unit using button presses and then decode its status via a series of color-coded LED flashes. It’s not difficult, but trying to pull up a support PDF on your phone - the printed instructions are just easier.Still not wild about the price, but I'd begrudgingly pay it again because I feel like the quality is. It consistently fires up before any condensation gathers and I don't have to gasp through any more steam plumes caused by my wif... er... that unnamed culprit's lava showers.

I just installed 2 of these in our 2nd floor full baths, and both are working well! They turn on within 30 seconds or so of the showers being turned on in both bathrooms. Both bathrooms have 7.5 ft ceilings, and the fan switches are located no more than a few feet from the tub and shower enclosure.I programmed ours to turn on at the lowest relative humidity (35%) with a 30 minute timeout. Note that after the timeout period shuts the fan off, if the relative humidity (RH) still exceeds the preset percentage limit, the device will reactivate the fan for 50% of the programmed time - so if the timeout is 30 minute and the RH is still too high, the fan will reactivate and run for an additional 15 minutes, which is half the 30 minute timeout I programmed - it will do this 2X if needed, so in that case, the fan will potentially run for a total of 60 minutes if a 30 minute timeout is programmed - programmed time values are 10,20,30 and 45 minutes.Installation is straightforward - I wire nutted the line and load leads on this switch to existing pigtails for the mechanical timer that I replaced with this switch. I added the neutral lead wire from this switch to the existing wire nutted neutral bundle, and the ground lead to the ground bundle.Note that this switch DOES NOT require a neutral, but if no neutral is present, the white sleeve on the neutral lead is removed to re-identify it as a ground wire, and both that wire and the explicit ground lead are both connected to the ground wiring in the box - so while a neutral wire is not required, a ground is required in the box to make this switch work - note that in older homes without an explicit ground wire, sometimes the steel box itself is grounded, so a ground lead could be attached to the box and wire nutted to the re-identified ground lead and explicit ground lead on this switch.There are an impressive number of programmable operating modes and settings within those modes on this switch. Out of the box, the switch is defaulted to operate in bath fan mode, with a 20 minute timeout period and a 50% relative humidity setting, which likely will work fine for many folks.As mentioned, I overrode the default timeout from 20 minutes to 30 minutes, and the relative humidity from 50% to 35% - the programming is a bit tricky and may take a couple passes - best bet if you mess up is to let the programming period timeout so that the settings aren't saved, and then re-enter programming mode after your "practice run" after you have the hang of programming it.Keep in mind too that the switch can be operated manually, and will run for the programmed time when turned on; the automatic operation can be disabled by pressing the bottom of the switch for 5 seconds, and re-enabled by pressing the top of the button.

I love this switch more than someone should love a switch. I know, that sounds like hyperbole. Let me explain.Prior to installing this, my bathroom fan switch was on the opposite side of the room from my shower and at an angle where it wasn't in line of sight; as such, I often would remember I needed to turn on the fan only after I had started showering, which either meant a cold, wet walk across the room or skipping the fan altogether. For the times I remembered to start the fan ahead of time, I'd have to either remember to turn it off after the steam had cleared, which could take a while after finishing my shower... Not great.Now, the fan turns on automatically within about a minute of starting my shower, and turns off when the humidity drops below the setpoint. No more having to remember to turn the fan on and off. Installation was not much different than installing a regular light switch.

Works as expected! I've installed 6 now and no issues. They automatically turn on and off based on humidity levels just like I wanted. Missing a star because they do not come with wire nuts, which are required to install.