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How to Install Leviton’s Humidity Sensor

Today you’ll learn how to install the Levition humidity sensor.

Does your bathroom get humid?

Nobody likes feeling sticky first thing in the morning.

Not even that kid from Willy Wonka.

What was his name? Oh yah, Augustus Gloop.

Today we’ll show you how to end the madness in your bathroom using one device.

You’ll see how to install it in less than 5 minutes,

Getting Started

My buddy Bill White, who’s a registered electrician, walks you step-by-step through this process.

His charge for something like this is roughly $120.

So this is a great tutorial. Plus, we’re giving away a few humidity sensors.

Holy mackerel!! This is gonna be a good tutorial.

The best way to stop humidity is to have a bathroom fan.

But who turns it off?

If you’re like me and have kids, nobody turns it off until you do.


Here are the supplies you need

Leviton’s humidity sensor and fan control solves this problem.

Leviton Humidity Sensor and Fan Control

It senses the humidity level in the bathroom and automatically turns off after the moisture dissipates.

The sensor saves electricity and keeps your bathroom mold free.

We’re gonna show you how to install Leviton’s humidity sensor.

You’ll be surprised with the easiness of this project.

How to Wire the Leviton Humidity Sensor (see an electrician in action)

The first step is to turn off the electricity.

Turn off electricity

Do this at your panel or fuse box.

Then remove the existing bathroom fan switch.

Before you remove any wires take a picture.

It’s nice to have a reference, especially if you mess up…which I’ve done plenty of times.

Also, the humidity sensor NEEDS a neutral wire to work.

If you don’t have a neutral wire (which is typically white) you can’t use the humidity sensor.

It’s a good idea to check this before buying the sensor.

The back of the humidity sensor has 4 screws.

  • Black connects to the power source
  • Silver connects to the neutral wire.
  • Purple connects to the load that carries electricity to the fan
  • Green connects to the bare copper ground wire

Bill shows you step-by-step how to wire the humidity sensor in our video.

The sensor has pressure plates for installing the wires.

Thus, there’s no need to wrap wires around terminal screws.

You strip the insulation off the wire (about 1/2″) and slide it behind the pressure plate.

Then tighten the screw.

Yep, it’s easy.

Pressure Plates

Your wire is tight when it twists with the device.

Again, another great tip from Bill.

Also, make sure the humidity sensor faces the right direction.

“Top” is on the top of the device to indicate the proper installation.

Direction of Sensor

After the sensor is wired you have to program it.

Don’t worry, this is simple to do.

Setting Up the Humidity Sensor (easier than programming your DVR)

Where can you use a humidity sensor?

Anywhere you have a humidity problem.

Bathrooms, basements, garages, you name it.

If you have an exhaust fan with a neutral wire you can use the sensor.

There are 3 dials on the Leviton humidity sensor/fan control.

Each one has its own function.

3 Dials 3 Functions

The first dial controls time.

When you press the sensor it will run based on this dial setting.

When the sensor is set to automatic mode it runs until all the humidity is removed.

Dial 1 Controls Time

Dial 2 controls humidity sensitivity.

The more sensitive the setting the more the sensor will sense humidity.

Kinda self explanatory, lol.

You can set this to Lo, Medium, or High.

Dial 2 Controls Humidity

Dial 3 controls both humidity and air cycling.

What is air cycling?

No, it’s not you imitating Lance Armstrong while sitting on your couch.

Although I’d love to see that.

Air cycling allows the air to mix in the room to reduce humidity levels.

You can set the sensor to do this automatically once every hour.

Dial 3 Controls Air Cycling

For a complete detailed explanation of the Leviton humidity sensor watch Bill.

He also reveals how to save money if you have to hire an electrician.

Bill has Jedi electrical skills.

And he’s one of the nicest and smartest contractors I know.

If you’re in Pittsburgh lookup Bill White and Live Wire Service Group.

BUT he’s one of those guys that’s always busy — so good luck.

Plus I’m kidnapping him to do videos, haha.

What’s Next

We hope this tutorial helps you with your bathroom.

Don’t forget, bathrooms also require GFCI outlets by code. If you need a new one our step-by-step tutorial is super helpful.

If you’re doing a bathroom remodel and need help, join one of our online courses – they’ll make your bathroom renovation much easier!

Let me know if you have any questions and I’ll do my best to help.

Thanks as always for reading, watching, and leaving your comment.



Leviton Humidity Sensor

  1. Sondra says:

    This sounds awesome. We have a walk-in closet that this would be perfect in. There are some clothes that I don’t put in the dryer. I hang them up wet. Then I have to leave the closet door open until they are dry. I have been wanting to get a fan installed in there but I didn’t want to leave it running all the time. I think this would be a perfect solution.

    1. This would work for your clothes Sondra. Yah, you’d have to install a bath fan inside the closet and vent it outside. But it would work similar to a bathroom in that it pulls the moisture from the air. Not sure though how long it will run πŸ˜€

  2. Stephen Savarimuthu says:

    Hey Jeff! Thanks for the great videos.

    Because of your videos, I’ve become much more confidant in myself to perform DIY projects throughout my home. Being a new homeowner, your website, videos, and podcast have provided me with so much knowledge to do anything I would want to do.

    I would love a humidity sensor for our master bathroom! Since there is no door on our bathroom, the steam from the shower has caused our whole bedroom to be super muggy (my wife loves her hot showers). While we have a fan in our shower, we tend to forget to turn it on as we rush to get ready for work in the morning. This would be a great way to know that the humidity would be controlled at all times.

    Thanks again for all you do!

    1. My wife likes her warm showers, too πŸ˜€

      Sometimes we both forget to turn off the fan or set the timer to 60 minutes. So having a humidity sensor helps in both cases.

      Super stoked you feel more comfortable Stephen doing DIY.

      How’d you garage door fix go?

  3. Carlos says:

    Hi Jeff. First off, I didn’t even know a humidity sensor like this even existed. Had I known, we may have gotten one years ago. I say this because my wife and I constantly battle about turning the bathroom fan on and off. I try to turn it on whenever I remember while taking a shower, and keep it running for about 5 minutes afterwards, while my wife never turns on the fan, mostly because she doesn’t remember to do so.

    The Leviton humidity sensor would go a long way to adding some peace and a (hopefully) mold-free future to our bathroom. πŸ™‚ Thanks!

    1. Ah the bathroom battles! Yes, this is a point of angst with all couples Carlos, haha.

      Well if a $30 humidity sensor can help I think you should install one buddy πŸ˜€

  4. Andies says:

    Thank you for this post! We recently moved into our new home and have been battling bathroom humidity fiercely. We need the humidity sensor because I am the only person in our home who turns the bathroom fans both on and then off. I’m hoping with this little device I’ll put an end to walking into muggy just-showered bathrooms or into bathrooms where the fan has been whirring for hours with no need. Thank you!

    1. Same thing happens in our house Andies, our kids never remember to turn off the fan. So you bring up a great point, this little device saves electricity while fighting humidity πŸ˜€

  5. Chandy Krenn says:

    Oh this is perfect! The house is moved into has a humidity problem in the downstairs bathroom (no window). I’m going to look into these.

    Thanks for sharing!

    1. Glad to help Chandy :d

  6. Snowman says:

    I didn’t know that something like this existed. You would think it would be a common device. I’m going to have to look into getting one for my bathrooms and atrium. Currently I have a humidity meter in the atrium and open and close the window to control humidity. Hooking up an exhaust fan to a sensor so I don’t have to do that will be awesome.

    1. This would be great for an atrium Snowman. Never even crossed my mind to use it there.

  7. Sean says:

    Great tutorial! The Leviton humidity sensor and fan control would be perfect for my bathroom. Currently, nobody uses the fan when showering and getting it all steamy. This sensor could be our “enforcer.”

    1. Haha, the enforcer.

      I like that name better than the humidity sensor Sean.

      Good point about it being able to monitor the bathroom situation without you being there.

  8. Paul says:

    Takes a little practice, especially in the summer, to get settings right, but having done so, this puppy is a worry free economical way of clearing damp air. Need more!

    1. Sound like you installed one Paul.

      Glad to know it’s working for you buddy πŸ˜€

  9. Suzann says:

    Oh my goodness!!!! I had no idea that there was such a sensor!! I have COPD and taking a shower is extremely difficult because of the humidity. I’ve tried cooler and cooler water…no help ……I still find myself gasping and needing to put on my oxygen during the shower, all because of the humidity….then the hose, nose cannula and everything else get drenched….I’m telling you….it’s quite the process for me….Thank you so much for this information….I’m excited about this “new” find!!!

    1. Oh my Suzann, sorry to hear you have trouble breathing. COPD is very hard to live with, especially in the humid shower.

      This will work with your bathroom fan to pull out the humidity. If for some reason the sensor doesn’t work well with the fan you could also upgrade the fan.

      We like Panasonic, they make fantastic fans.

      Hopefully this helps your Suzann πŸ˜€

  10. Mary Lou says:

    Your DIY video’s and advise have been so helpful to me since I am a female living alone who tries to be very independent. I would love to have a Leviton humidity sensor for my hallway bathroom. There is no window for ventilation and the existing fan just doesn’t seem to completely remove the dampness in the room. Hence, I am constantly having to scrub things clean, which also keep dampness in the room. Never-ending circle! Being on my own, cost is extremely important to me with my limited and tight budget. Receiving one of these would be a God-send and having your video to back me gives me the confidence that I could handle this install myself
    ! Thanks for your consideration! And keep the DIY info coming, I couldn’t do it without you!

    1. Super happy to help out Mary Lou.

      I have no doubt you can do this project.

      It will also help to reduce your cleanup πŸ˜€

  11. Rick Stuart says:

    Great tutorial video on how to install the Leviton humidity sensor as are all your DIY tutorials. I could really use one in my master bedroom. It doesn’t have a window so has a fan but it never gets turned on and as a result, the paint eventually starts to peel from the humidity. With the sensor, we wouldn’t need to remember to turn the fan on or off. A great solution.

    1. Humidity does all sorts of bad stuff in the bathroom Rick.

      It’s bad when the paint starts to peel.

      Definitely worth the $30 for this device πŸ˜€

  12. Matt palazola says:

    Longer term project to renovate our entire hall bath.

    1. This is a good small project to help you get started Matt.

      And stay posted. We’re gonna have more videos on bathroom remodeling.

      You can also check out Bathroom Repair Tutor and see if it’ll help you

  13. joe says:

    If I leave the bathroom door open and take a shower and forget to turn on the fan, the smoke detector in the hallways goes off. No fun jumping out naked and wet to fix things. It is not a good memory for the kids.

    1. LOL.

      Now that’s an image.

      Don’t worry this will help solve the naked happy dance Joe

  14. Ang says:

    This is exactly what I need. I can’t stand a wet bathroom and I end up leaving the exhaust fan for too long.

    1. We are in the same boat Ang.

      Nice to have a device that can do the work for you πŸ˜€

  15. Dan S says:

    Looks like a great device. We always have to leave the fan running after a shower then check back later to turn it off. Looks like this would save us time every day.

    1. It would be one less thing to remember Dan.

      And now you know how to install it.

      I’d say go for it and make this one of your next projects πŸ˜€

  16. Paul Someson says:

    I have my son, wife and 3 children living with my wife and I. Our guest bathroom is always being used. There is a lot of washing hands and taking showers and a lot of humidity. We have a exhaust fan but sometimes people don’t turn it on so a humidity sensor would help a lot to control mold.

    1. Whoa, a lot of people use your bathroom Paul.

      The humidity sensor will help with the humidity.

      Plus, the kids don’t have to remember to turn it on or off πŸ˜€

  17. Joyce says:

    Thanks Jeff and Bill. Timely I’d say! My tiny bathroom which has 2 tall closest In it have been a tough one to keep clean for it never had an exhaust fan installed. I just bought a fan but am glad to see this sensor. would love to try it out ! Best wishes and keep up the great DIY support you are offering

    1. Once you get the fan installed you’ll be able to use the humidity sensor Joyce.

      Just make sure you have a neutral wire in the electrical box so the fan will work with the sensor.

      Thanks for your kind words πŸ˜€

  18. Lori B says:

    I have an old farmhouse that has a very small bathroom. And I hate to add that I am at that age that my humidity level is quite high! So bathroom humidity and me have a problem. I can’t dry my hair in there, I can’t put on makeup, clothes stick…etc…I am also a sole supporter that has to pick and choose what gets done around the farm. No sympathy requested. I LOVE my house and farm. It’s just so old that the maintanence is non stop. I would love to win this and then be able to start my days off a little drier! Thanks for all you share too!

    1. Old farmhouses are beautiful Lori.

      They do get humid.

      This little device will certainly make a HUGE difference in the morning for you πŸ˜€

  19. Ryan says:

    This is a great upgrade for also reducing energy usage. My wife can tend to leave items on when she is not in the room. I would like to install the sensors in my bathrooms so they only run when needed to reduce our energy use.

    1. The settings are easy to adjust Ryan.

      So you could install and adjust the humidity sensor to meet your needs buddy πŸ˜€

  20. Char says:

    Ok Jeff, let’s not blame the kids here—the adults forget as well! Especially visitors who use the 2nd bathroom—fan could run for 24 hours plus if not checked. And yes, do see it in the electric bill. Has everyone’s power increased as much as it has here in the west? As well he master bath shower is killer humidity in the bedroom. Did not know this existed and is definitely a need! Thinking a fan needed there for sure—with one of these definitely -no window….I believe this is the solution.
    Love the videos—breed confidence for sure, thank you so much.

    1. Haha, yah the adults are just as forgetful Char.

      Glad you liked the video and hope this helps you πŸ˜€

  21. char says:

    Congratulations to Bill and his wife and his new SON–now the fun begins. Best wishes!

  22. Ingrid says:

    Such a sensible product. My daughter remembers to turn on the fan (which doesn’t really remove the steam, ha). However, she never returns to turn it off.

    1. Hmm, maybe a new fan would help you Ingrid. That plus a humidity sensor would be a one two punch πŸ˜€

  23. Andrea says:

    We are building a new house (footings just went in this morning), and this would be perfect for the master bath. We were just talking yesterday about how we never remember to turn off our fan, and that it gets more use than anything else in the house.

    1. New house!!! Super excited for your Andrea.

      This plus a powerful bathroom fan would be great in your bathroom.

      What plans do you have for the new bathroom? Walk-in shower?

  24. Jeff says:

    This product serves multiple purposes! The first is that it eliminates the chatter between my wife and kids and I about who forgot to turn the fan on and off! The second purpose is the elimination of an environment that would promote the growth of mold and mildew. Another benefit is the enerergy savings from leaving the fan on which could also remove excessive conditioned air. I’m sure there are other benefits that will be discovered with use. The tutorial was excellent and should make installation and programming easy for a novice.

    1. Lol, chatter is right.

      In my house it’s just me reminding my kids.

      Great points Jeff πŸ˜€

  25. Rosh says:

    We definitely need those for our bathrooms, the exhaust fans from the builders doesn’t cut it. We’ll use these for humidity control and to save on electricity.
    Thanks for posting, didn’t know they existed.

    1. Those builder grade fans do suck Rosh.

      Which ironically is the problem.

      Anything that saves electricity is great πŸ˜€

  26. Kim says:

    We have a problem with mold accumulation in the master bathroom. A sensor would help, I think.

    1. Mold stinks.

      Sorry to hear you have that problem Kim.

      Do you have a vented bathroom fan?

  27. Myrna says:

    This would be such a nice thing in our home. Even though we are grandparents the grandkids just walk out and leave the fan on till we turn it off.

    1. Installing a humidity sensor will save money Myrna.

      And the grandkids don’t have to remember to turn it on or off πŸ˜€

  28. Kurt says:

    We recently remodeled our bathrooms and installed quiet fans….only they are too quiet so often times they’re left on long after the humidity from the shower has dissipated.

    Oh the flip side, we sometimes forget to turn the fan on (doh!) before getting in the hot, steamy shower.

    1. See I knew it!!

      Loud fans are better (for multiple reasons!), haha

      Any device that works on its on is good πŸ˜€

  29. Theresa Wynne says:

    The humidity sensor is a great idea! My boys are always leaving the fan on after their showers. I am constantly turning it off. Thanks Jeff!

    1. Those boys!!!

      Although my Mom says she liked raising boys.

      Either way this works for boys and girls, ha πŸ˜€

  30. Hank Wolgast says:

    Jeff, the new humidity sensor sounds like it will fill the bill for our new bathroom fan to be installed in place of the light fixture in the ceiling. The fan also has a light plus a heater for my wife who is always cold in the bath.Hopefully this will solve our problem. Thanks for the timely post. You have saved the day as usual. Thanks for all the informative videos that you post. You have helped this old man immensely.

    1. Well Hank you’ve been a great help to me.

      Thanks for always being there for our members.

      Your tips are great.

  31. Teresa says:

    Wow! That is so cool. I would love to have this in my bathroom.

    1. It is cool Teresa.

      New electrical devices are becoming super smart.

      It’s an exciting time to be a home owner

  32. Terri Hughes says:

    This would be great. My bathroom is humid, it does have a fan. The fan doesn’t help that much. And no windows makes it worse. Thanks!

    1. This could help Terri.

      Turn your fan on and place a tissue close to it.

      If the tissue sticks to the fan grill it has good power.

      But if you want to upgrade to a new fan we like Panasonic and Broan.

  33. Maxine says:

    I never knew this existed! I live in a townhome with 2 bathrooms, neither of which has a window so humidity builds up quickly. I try to turn on the fan before showering and keep it running a few minutes afterward — unless I am in a hurry and forget which is most days. I’d love to win one of these and if I don’t — I will shop for one anyway. Thank you for this great tutorial.

    1. You’re doing a good job trying to get rid of the humidity Maxine.

      20 minutes is a good timeframe for the fan.

      But you’re right, this device could do that automatically for you πŸ˜€

  34. Len says:

    Thanks for letting me know this exists! I’m adding one to the kid’s bathroom. Thanks for the videos!

    1. Super happy to help any time Len πŸ˜€

      Keep us posted on your project buddy

  35. There is a high incedents of fires in bathroom exhaust fans,when as quite often they are foregotten and left on.We live in southern oregon and have issues with mold/midew. I would love to win one,and i could get my ex to install it for me! HOPING TO WIN THIS ONE! Thanks

    1. Boy that’s not good to have a fire started by the bathroom fan.

      Good point about the motor creating heat Lynda.

      Let me know if you have any questions about the installation πŸ˜€

  36. dan says:

    Thanks for info. I have 3gang box ready to go. I hope 3 decorator cover will fit over the humidity control. Or should I put this in a different box?

    1. As long as you have enough space in the box you should be okay Dan.

      Check that you have a neutral before you get the sensor πŸ˜€

  37. Jim says:

    I have a steam shower in my master bath and I can’t seem to remember to always turn on the fan. And most of the time when I do I will walk away without turning it off.. this seem like the perfect solution.

    1. Don’t worry Jim I forget, too.

      Having automation is good, especially in the bathroom.

  38. Debbie C says:

    Had no idea this existed! I turn the a/c on high to,help alleviate the sticky feeling I have while dressing after a shower. In the winter I keep the bathroom window open to draw the steam out, this will be so much better! Always great info from you, thanks!

    1. Windows are great Debbie, a bit cold in the winter though πŸ˜€

      This could help for sure with the humidity

  39. Mason Leskowitz says:

    Yes! Just what my family needs. I had no idea that such a thing existed. Thanks for bringing it to my attention.

    1. Glad to help any time Mason.

      Yah, it could totally be a solution πŸ˜€

  40. Gilda says:

    This is awesome. The tutorial was simply explained and easy to follow. We have a fan in our bathroom but still have a problem with mold. I read where the fan needs to run at least 20 minutes to take care of the problem after the shower stops. With a busy life style,,,, this is not always feasible. So this would be perfect.

  41. Shawn says:

    I have a similar DewStop in the main bathroom and it’s great. We rarely use the other bathroom, but it would be a nice add for when it is needed.

  42. dennis allen says:

    hi jeff, I can really use this. my wife either doesn’t turn on the fan or turns it off too soon.

  43. Bill Logue says:

    My wife and I are renting while saving to build our own house. The house we rent is an older structure and has moisture issues. A former co-worker/friend of mine died as a result of complications after being exposed to black mold in his home. His home was comparable in age with the house we rent. I would be very grateful to be able to install this device in my ongoing efforts to prevent mold growth and keep my family healthy.
    Bill Logue

  44. Sridhar says:

    Jeff: Great video on a very useful item. I am planning to remodel my bath room and this will come in very handy. How about a video that shows how to install an exhaust fan in a bathroom without any overhead lights? Thanks.

  45. Lincoln says:

    KIDS! Seriously, do all the lights and fans need to be on all the time?? Send me one of these and I’ll have them help with the installation as punishment….I mean a teaching experience.

  46. liz says:

    This is a great idea! I always forget to turn on the fan before my shower!

  47. AL says:

    About 3 or 4 years ago my son had his home built by a contractor but they forgot to install a bathroom fan. Well they didn’t forget they just did not want to make the expense-cheap bastards. Now my son keeps asking me what chemicals he needs to pour in his shower to kill the smell. He needs the fan and the sensor. Thanks. AL.

  48. Bob Blubaugh says:

    This device can help with foggy mirrorsin the bathroom, but for me/us it will be most helpful in our basement which is always humid. We have used dehumidifiers, but they are not effective on a full bassement.

    Would really like to try one of these in our basement.


  49. Cris says:

    This would be awesome since my current bathroom has to be completely renovated since the humidity got so bad it caused mold in the walls which is not good. There is a fan, but it gets turned off with the light so that doesn’t help much. This system beats the regular fan by miles.

  50. David Nippoldt says:

    This is a great idea. Who remembers to turn on the the fan before getting on the shower? Now the fan will come on when it’s needed AND turn off when it’s not. I need to get one of these!

  51. Rob Bland says:

    I saw a fan at Costco once with a humidity sensor built into it, but I didn’t buy it and I’ve never seen it again. This would be a great alternative to that and as an extra plus would use the current fan I’ve got. Thanks for the great idea and with or without winning one I’ll probably get this done.

  52. John Wilimczyk says:

    I could use one in the downstairs bathroom my son likes to take long showers and he occasionally forgets to turn fan on

  53. Noah Laws says:

    Now I wish I didn’t live in the desert with windows in both bathrooms. I’d love to do this, unfortunately:
    1. Swamp cooler.
    2. Windows.
    3. Humidity doesn’t last long here.
    Great article! Now to find one that helps me figure out what I did wrong with wiring in a GCFI switch that now no longer turns on the second light in the strand!

    1. Thanks Noah for your comment. Good to hear you don’t have a humidity problem.

      By the way, you might get help with your GFCI with this tutorial we made. It sounds like you just need to swap out the Load and Line wires

    2. Karolane Lapointe Champagne says:

      Hi Jeff!
      I have a question about the LED indicator:
      When should it be ON and when should it be OFF?
      For now, when the AUTO mode is on, the green light still light up.
      Is it normal?
      Thanks you !

  54. Lisa Kiefer says:

    I need one of these. The last time I turned my bathroom fan on, it ran for 12 hours because I forgot it was on. Needless to say, I don’t turn the bathroom fan on very often.

    1. You do need one, lol. This will help a lot with that problem Lisa. And if you run into any problems Leviton’s technical support is great.

  55. Joe says:

    This product is a great solution for many high-moisture area problems. My forgetfulness, my wife’s inattention, and our grandchildren often transiting the area combine to make the exhaust fan work more than necessary as well as operating when it should be turned-on. This switch should solve most of those instances.

  56. Josh Barter says:

    This is perfect! I have wired many of Levitons smart switches in my home to connect my lights to Alexa and Samsung Smartthings. (building the backbone of my smart home) I was completely unaware Leviton made these! I would love to give one a try as my kids and I are always forgetting to turn off the fan, or even turn it on for that matter!

  57. Steve says:

    Are there any easy options if you don’t have a neutral wire?

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