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Humidity Sensor Switch and 70/90 CFM Bath Fan Combo

  • Optimize humidity with sensor and auto exhaust fan
  • Select 70/90 CFM fan speed for custom ventilation
  • Prevent mold and mildew with smart humidity control
  • View More Details

Items in this bundle (2)

  • XactSense Humidity Sensor Switch for Bathroom Exhaust Fans, 3 Amp, Single-Pole, White (MS-HS3-WH)
    $41.95

  • Whisper Mighty Pick-A-Flow 70/90 CFM Ceiling/Wall Bathroom Exhaust Fan, Energy Star with 9 in. x 9 in. Grille Footprint
    $97.98

Product Details

XactSense Humidity Sensor Switch for Bathroom Exhaust Fans, 3 Amp, Single-Pole, White (MS-HS3-WH)

About This Product

Reduce moisture, mold and mildew in your bathroom with Lutron's XactSense Humidity Sensor Switch. The precision of the sensor allows for accuracy in responding to changes to humidity, automatically turning fans on and off to ensure your bathroom maintains optimal air quality and comfort. Say goodbye to mold, mildew, and excessive steam as Lutron's XactSense Humidity Sensor Switch helps maintain ideal humidity levels. Enjoy a more comfortable and pleasant bathroom experience by reducing dampness, stuffiness, and humidity. Additionally, save on energy costs with smart humidity control that optimizes your bathroom fan usage, ensuring it runs only when necessary. Compliment other Lutron devices, adding a touch of elegance to your bathroom. Rest assured knowing this sensor meets Title 24 and IECC 2021 standards, helping to meet energy and indoor air quality codes. This humidity sensor seamlessly integrates into any bathroom design. Plus, benefit from Lutron's 24/7 technical support ready to assist you with any questions or concerns. Upgrade your bathroom with Lutron's Humidity Sensor and experience the ultimate in comfort, efficiency, and style. Trust in Lutron's time tested performance and quality to enhance your living space.

Highlights

  • PRECISE HUMIDITY CONTROL: Lutron's XactSense Humidity Sensor Switch accurately responds to changes in humidity, automatically turning fans on and off to reduce moisture, mold and mildew
  • ADVANCED AND ELEGANT: Blend state-of-the-art technology with sleek, elegant design with Lutron's XactSense Humidity Sensor Switch
  • CLEANER AIR: Prevent mold, mildew, and excess steam by maintaining ideal humidity levels, promoting a healthier bathroom environment
  • ENHANCED COMFORT: Improved airflow reduces dampness, stuffiness, and humidity for a more comfortable bathroom
  • ENERGY EFFICIENT: Save on energy bills by making sure your bathroom fan only runs when needed
  • ENERGY CODE COMPLIANT: Meets title 24 and IECC 2021 standards, ensuring it adheres to the latest building codes
  • EASY INSTALLATION: Simple, straightforward installation process that fits into decorator-style wall plates upgrade your bathroom fan control in as little as 15 minutes, with no neutral wire required
  • VERSATILE DECORATOR DESIGN: Lutron's XactSense Humidity Sensor Switch matches other Lutron devices, allowing for limitless configurations
  • SUPPORT YOUR WAY: Lutron provides 24/7 technical support, as well as a step-by-step wiring wizard, installation videos, video assistance, and more
  • TECHNICAL DETAILS: Compatible with 3 amp fans, neutral wire is optional
  • INCLUDES: 1 XactSense Humidity Sensor Switch, wallplate sold separately
  • Lutron wiring wizard for installation help for dimmer switches, fan switches, 3 way switches
  • Click here to learn more about Eco Options and Energy Efficiency
  • Click here for more information on Electronic Recycling Programs

Product Information

Internet # 334623491

Model # MS-HS3-WH

Store SKU # 1013678489

Specifications

XactSense Humidity Sensor Switch for Bathroom Exhaust Fans, 3 Amp, Single-Pole, White (MS-HS3-WH)

Details

Returnable

90-Day

Warranty / Certifications

Manufacturer Warranty

10 Years with Product Registration

Questions & Answers

Can I install this with a 4” to 3” reducer at the wall opening?
ByApr 10, 2026
0 Answer | 
Answer This Question

Is this humidity sensing
ByApr 1, 2026
1 Answer | 
Answer This Question

Hi Keith! This model does not include humidity sensing. If you’re looking for a fan that turns on automatically when moisture is detected, check out Panasonic models like WhisperChoice Auto or WhisperGreen Select, which feature built‑in humidity/condensation sensing.

By|Apr 11, 2026
    0/0

    (1)

    Leviton Decora In-Wall What's the difference between Leviton Decora Humidity Sensor and Lutron XactSense? Which one is better?
    ByMar 26, 2026
    1 Answer | 
    Answer This Question

    Yaro, Thank you for your interest in Lutron and for your question! While I’m not able to speak in detail about the Leviton Decora Humidity Sensor, I can highlight what sets the Lutron XactSense apart so you can better compare: Automatically runs your exhaust fan as humidity rises and turns it off when levels return to normal Uses precise sensing technology to detect both gradual humidity changes and sudden spikes (like from a shower) Helps prevent mold and mildew by responding quickly and accurately Saves energy by only running the fan when needed Designed and tested to perform reliably across a wide range of environments Matches Lutron Diva-style controls for a clean, consistent look In general, the biggest differences between humidity sensors come down to how accurately and quickly they detect changes, and how reliably they avoid false triggers. XactSense is specifically engineered to deliver more precise, responsive control compared to typical humidity switches. If you’d like help deciding based on your specific bathroom setup, feel free to reach out to our 24/7 Technical Support Team at 1-888-Lutron1 (588-7661) or support@lutron.com Amy @ Lutron

    By|Apr 16, 2026
      0/0

      (1)

      Can this fan be used in a hair salon bathroom
      ByMar 22, 2026
      1 Answer | 
      Answer This Question

      Yes, this fan can be used in a hair salon bathroom. The Whisper Mighty is designed for small to medium‑sized rooms and is suitable for removing humidity and general air pollutants in bathroom environments. It provides 70 or 90 CFM ventilation and is ENERGY STAR® certified, offering efficient, quiet performance. For a hair salon bathroom, just make sure the chosen CFM level meets the room’s ventilation requirements. If the bathroom is larger or experiences heavier moisture or odor load, you may want to size up to a higher‑CFM model.

      By|Mar 24, 2026
        0/0


        Can you paint the cover?
        ByFeb 25, 2026
        1 Answer | 
        Answer This Question

        Yes, the grille cover can be painted as long as you remove it from the fan first and use a light coat of spray paint to avoid blocking the ventilation openings. Be sure to paint only the outer grille and allow it to fully dry before reinstalling it.

        By|Feb 26, 2026
          0/0


          Can this switch be used with a gfci circuit?
          ByFeb 14, 2026
          1 Answer | 
          Answer This Question

          Hello! The MS-HS3 can be installed on the load side of a GFCI. We do not recommend using the MS-HS3 to control the GFCI.

          By|Feb 17, 2026
            0/0


            How many amps does it pull?
            ByFeb 13, 2026
            1 Answer | 
            Answer This Question

            The WhisperMighty Pick‑A‑Flow 70/90 CFM fan draws 0.26 amps.

            By|Feb 17, 2026
              0/0


              Can you install this unit as a retrofit unit, or do I need to cut open the drywall and patch after it we install this?
              ByJan 19, 2026
              1 Answer | 
              Answer This Question

              The intention of this fan is for a new construction installation or a remodel down to the studs.

              By|Mar 29, 2026
                0/0

                (1)

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                Customer Reviews

                4.4 out of 5

                • 4.4 out of 390 reviews
                • 61% recommend this product
                Filter by:
                Showing 1-10 of 390 reviews
                Very simple to install, operate and works without even having to think about it ever again.
                by
                • Verified Purchase
                Highly recommend for mildew problems
                Very satisfied with this humidity sensing switch. We were replacing shower curtains every 4 months because of mildew build up. We would leave the bathroom and turn the fan off or not use it at all sometimes. I increased the sensitivity and now the fan turns on within a few minutes of a hot shower running, and its a good 10ft from the shower.
                by
                  It is build so poorly, and the sensor doesn't even pick humidity until the sensor itself is covered with shower vapors. Therefore replacing a switch with this is not a good solution, even at the highest sensitivity would not really deliver. I ended up returning it. Regular timer and done.
                  by
                  Response from lutronNov 10, 2025
                  Hello, and thank you for your feedback. We’re sorry to hear about the issues you experienced with the humidity sensor. Your input is valuable, and we’d love the opportunity to learn more and assist you further. If you have any questions or concerns, please don’t hesitate to reach out to us at customersatisfaction@lutron.com or give us a call at 1-844-LUTRON1. Our support team is available 24/7 and ready to help! lutron
                  • Verified Purchase
                  2 found this review helpful
                  This customer chose to rate the product and not provide text.
                  by
                  • Verified Purchase
                  Over pricing
                  I received this switch as a gift. It works properly and turns on when needed. However, the price is very, very high. This product should not be priced this way. It's simply a rip-off. There may be two of these switches available for this price. Even considering the 200% inflation. It's nothing special on this switch, such as a color screen and full adjustment. They just lost their conscience.
                  by
                  Response from lutronAug 5, 2025
                  Thank you for your feedback. Please know that Lutron takes pride in the quality of our products, from the components we use to the 100% end-of-line testing, to our dedicated 24/7 customer support team. Lutron is the #1 brand among lighting professionals whose reputations and businesses rely on quality products they can depend on to perform for years and years. If you have any questions about Lutron or our products, please reach out to our Customer Satisfaction team at customersatisfaction@lutron.com, or call us at 1-844-LUTRON1. We're here 24/7, so please call us anytime! lutron
                    5 found this review helpful
                    GREAT FOR CONTROLLING BATHROOM HUMIDITY!!!!
                    [This review was collected as part of a promotion.] This humidity sensor switch works great in my bathroom! My fiancé would occasionally forget to turn the exhaust fan on while showering, so this is super helpful!! It only took ten minutes to install. The sensor automatically turns the fan on when humidity levels rise. It also automatically shuts off once the humidity levels go back down. I worry about mold and mildew, especially in the bathroom. This sensor switch should help me avoid those issues!
                    by
                    This review is from Humidity Sensor Switch for Bathroom Exhaust Fans, 3 Amp, Single-Pole, White
                      Loved it
                      [This review was collected as part of a promotion.] Accuracy is great and the sensitivity is amazing in my opinion the instais fast and it durability so far o think the compatibility is good i think.
                      by
                      This review is from Humidity Sensor Switch for Bathroom Exhaust Fans, 3 Amp, Single-Pole, White
                        For the absent minded on humidity control
                        [This review was collected as part of a promotion.] We installed this Lutron Humidity switch in the guest bathroom primarily for the ones who forget to turn the exhaust fans on and off, and in the deep south, it can get hot and sticky extremely quickly and mold can thrive in the right situation . The switch itself seemed flimsy,not as solid as I would hope for, but I am hoping the functionality will override its cheap appearance and the solution to the occasional guest that forgets to turn the fan on and off.
                        by
                        This review is from Humidity Sensor Switch for Bathroom Exhaust Fans, 3 Amp, Single-Pole, White
                          Convenient to use, easy to install!
                          [This review was collected as part of a promotion.] This XactSense Humidity Sensor Switch from Lutron has been a useful addition to our main bathroom. Our exhaust fan is on it's own switch, and this XactSense humidity sensor is able to automatically control the ventilation based on humidity levels, making for a convenient solution for keeping moisture under control. Installation the switch was straightforward, but I recommend hiring a professional if you are uncomfortable with electrical work. This switch does not require a neutral wire, which is nice for those without one available. The humidity sensor quickly responds to rising humidity levels to turn on the exhaust fan, and turns if off after a user-selectable timeout setting. You are able to easily adjust the timeout period as well as manually override operation to turn on your exhaust fan. I like how this switch automatically turns the exhaust fan on and off, without any user input. Overall, I recommend this humidity sensor switch for anyone wanting to simplify operation of their bathroom exhaust fan. It has been extremely convenient, and has even saved energy as we no longer need to remember to turn the exhaust vent off.
                          by
                          This review is from Humidity Sensor Switch for Bathroom Exhaust Fans, 3 Amp, Single-Pole, White
                            Absolutely perfect humidity control
                            [This review was collected as part of a promotion.] I recently installed the Lutron Humidity Sensor Switch in my master bathroom, and I am genuinely blown away by how effective and convenient it is! This little device has completely transformed our post-shower routine. Installation was surprisingly straightforward, even for someone who isn't a seasoned DIYer. The instructions were clear, and I had it up and running in no time. But the real magic happens once it's in operation. The sensor is incredibly accurate, reliably detecting even small increases in humidity. Our old routine involved manually turning on the fan and often forgetting to turn it off, leading to wasted energy or lingering dampness. Not anymore! Now, the fan kicks on automatically as soon as the humidity rises, clearing out the steam and moisture efficiently. What's even better is that it turns off on its own once the humidity returns to normal, saving energy and giving me one less thing to worry about. The fan runs exactly as long as needed, and no longer. It's quiet, unobtrusive, and flawlessly integrated into our bathroom's functionality. If you're looking for a smart, reliable, and energy-efficient solution to manage humidity in your bathroom or any other damp area, look no further. The Lutron Humidity Sensor Switch is a game-changer and an absolute 5-star product in my book!
                            by
                            This review is from Humidity Sensor Switch for Bathroom Exhaust Fans, 3 Amp, Single-Pole, White
                              Showing 1-10 of 390 reviews