Are you tired of turning on your bathroom fan only to hear a loud, annoying buzz? Or worse—forgetting to turn it on and ending up with a fogged-up mirror and musty smell? I totally get it. I used to deal with the same thing until I switched to a quiet exhaust fan with a smart humidity sensor. Let’s just say, it’s a game-changer!
In this guide, I’ll walk you through the quietest bathroom exhaust fans with humidity sensor ratings that are available right now. These fans don’t just keep your bathroom air fresh—they do it quietly and automatically when moisture levels rise.
Table of Contents
🔄 Quick Comparison Table
| Product Name | Noise Level | CFM | Best For | Amazon Link |
|---|---|---|---|---|
| Broan-NuTone QTXE110S | 0.7 Sones | 110 | Medium bathrooms | View on Amazon |
| Homewerks 7136-02HW | 1.0 Sone | 140 | Large bathrooms | View on Amazon |
| Aero Pure ABF110DH G6 W | Variable | 50–110 | Custom airflow | View on Amazon |
| Delta BreezSlim SLM70H | 2.0 Sones | 70 | Small spaces | View on Amazon |
| Tech Drive Super Quiet | 1.2 Sones | 110 | Medium bathrooms | View on Amazon |
✅ Top 5 Quietest Bathroom Exhaust Fans with Humidity Sensor Rating
1. Broan-NuTone QTXE110S Ultra Silent Fan
- VERSATILE FAN: Ventilation fan helps eliminate , tobacco smoke, and cooking odors in a near-silent performance in rooms up to 105 sq. ft. to keep your house smelling fresh and clean
- EFFICIENT: Operates at 110 CFM and 0.7 Sones and is motor engineered for continuous operation to provide the best performance
- EASY INSTALLATION: Includes 6" ducting for high-quality performance and hanger bars to provide a fast installation in 2" x 8" construction spaces
Last update on 2025-06-03 / Affiliate links / Images from Amazon Product Advertising API
If you want super quiet with smart moisture control, this fan is a winner. I’ve personally used Broan fans before, and this one is practically whisper-silent at just 0.7 sones.
Why you’ll love it:
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110 CFM airflow handles up to 105 sq ft.
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Sensaire™ humidity sensing tech turns the fan on/off automatically.
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Comes with a timer that’s adjustable between 5–60 mins.
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ENERGY STAR certified = lower energy bills.
Perfect for: Medium-sized bathrooms where you want power without the noise.
2. Homewerks 7136-02HW Bathroom Vent Fan
- Sensor detects humidity level in the room to turn bath fan on/off
- 140 CFM is perfect for rooms up to 140 sq. ft. and provides powerful airflow
- Exhaust fan operates quietly at only 1.0 sone
Last update on 2025-06-03 / Affiliate links / Images from Amazon Product Advertising API
Need serious airflow for a bigger bathroom? This Homewerks fan packs a punch at 140 CFM but still stays whisper-quiet at just 1.0 sone.
What stands out:
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Built-in humidity sensor activates at 60% humidity.
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Designed for larger bathrooms.
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Sleek, low-profile design fits modern spaces.
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Super easy to install and use.
Perfect for: Larger bathrooms and anyone dealing with excess moisture or mold.
3. Aero Pure ABF110DH G6 W Fan with Humidity Sensor
- Quiet ENERGY STAR qualified 1. 0 Sons adjustable speed bathroom fan with integrated Humidity Sensor engineered for continuous run
- Choice of three airflow settings- 50, 80, 110 CFM; set with adjustable switch located on fan body
- Quick mounting adjustable installation brackets and 4”, 5”, and 6” duct adaptor included
Last update on 2025-06-03 / Affiliate links / Images from Amazon Product Advertising API
This one’s great if you like control. You can toggle between 50, 80, and 110 CFM based on your needs. It’s quiet, sleek, and comes with a built-in humidity sensor.
Why it’s unique:
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Adjustable CFM levels = tailored airflow.
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Automatically turns on at preset humidity.
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Modern grille blends with any decor.
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ENERGY STAR rated.
Perfect for: Households that want more control over fan speed and airflow.
4. Delta BreezSlim SLM70H Bathroom Fan
- Energy Star qualified with innovative brushless DC motor technology
- In humidity sensing mode, the Fan will start when humidity is above 60%, and will stop when humidity is below 60% automatically
- UL approved for Ceiling or wall mount installation, the only 7.5 inch x 7.25 inch small size bath Fan in the market
Last update on 2025-06-03 / Affiliate links / Images from Amazon Product Advertising API
Got a small bathroom? This compact fan gets the job done with 70 CFM airflow. While it’s a bit louder at 2.0 sones, it’s still quieter than many standard fans.
Why it’s worth it:
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Humidity sensor for automatic on/off.
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Space-saving design—great for tight ceilings.
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Budget-friendly without skimping on features.
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ENERGY STAR certified.
Perfect for: Small bathrooms and powder rooms where space is tight.
5. Tech Drive Super Quiet 110 CFM Ventilation Fan
- Very quiet bathroom fan (1.2 sones) and Strong air movement (110CFM) for bathroom up to 110 Sq. Ft. Recommened for use in large room
- Two installation options:1. For New Construction: It can attaching the fan housing mounts to the ceiling joists,if spacing between is 12in. ( if spacing between16 in.- 24 in, It can using suspension brackets.Mounting bracket included ) 2. For Existing Construction : With No attic access installation and replaces most existing bathroom fans. it can be done entirely from the room-ceiling side – no attic access needed installation
- Two operation options: 1. Manual mode-The RED LED indicator lights, the fan will run continuously in this mode. 2. Humidity sensing mode- The LED indicator light will be green. In this mode the fan will automatically turn on when the humidity level in the room is above 60%
Last update on 2025-06-03 / Affiliate links / Images from Amazon Product Advertising API
If you like versatility, this fan offers multiple modes, including timer and humidity settings. At 1.2 sones, it’s quiet but powerful with 110 CFM airflow.
Why it’s solid:
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Smart humidity sensor + timer options.
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Great coverage up to 110 sq ft.
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Modern design with excellent air movement.
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Quiet operation compared to similar fans.
Perfect for: Busy households wanting a “set it and forget it” solution.
Buying Guide: How to Choose the Best Quiet Bathroom Exhaust Fan with Humidity Sensor
Let’s be honest—choosing the right bathroom exhaust fan isn’t as straightforward as it seems. I learned that the hard way after buying one that sounded like a jet engine. 🙄 Don’t make the same mistake! Here’s everything you need to know to find the perfect quiet fan that kicks in automatically when humidity spikes.
🔊 1. Noise Level (Sones Rating)
Let’s start with what brought you here—quiet operation.
Fans are rated in sones (not decibels).
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1.5 sones or lower = quiet
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Under 1.0 sone = whisper-quiet (you’ll barely notice it’s on)
If you’re like me and hate noisy fans that sound like a hair dryer, look for models around 0.3 to 1.0 sones.
Pro Tip: The Broan-NuTone QTXE110S is one of the quietest at 0.7 sones. It’s like ninja-level quiet!
💨 2. Airflow Power (CFM Rating)
CFM stands for Cubic Feet per Minute, which measures how much air the fan can move. It’s directly tied to how big your bathroom is.
Here’s a quick rule of thumb:
| Bathroom Size | Recommended CFM |
|---|---|
| Small (under 50 sq ft) | 50 CFM |
| Medium (50–100 sq ft) | 80–110 CFM |
| Large (100–150+ sq ft) | 110–140+ CFM |
If your bathroom has a tub, shower, or gets super steamy—go higher on the CFM.
🌫️ 3. Humidity Sensor – Set It and Forget It
This is the game-changer. The best fans today come with a built-in humidity sensor that automatically turns the fan on when moisture levels get too high—and off when things are dry.
Why it matters:
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No more forgetting to turn the fan on/off.
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Reduces mold, mildew, and paint damage.
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Saves energy and keeps the bathroom fresher.
Look for sensors that kick in around 60% humidity. That’s the sweet spot for comfort and mold prevention.
⚡ 4. Energy Efficiency (Look for ENERGY STAR®)
A fan that runs often shouldn’t run up your electric bill.
ENERGY STAR certified fans use less electricity but still deliver powerful performance.
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Saves $$$ long term
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Usually comes with quieter, more efficient motors
🔧 5. Ease of Installation
Some fans are made for new builds, while others are designed for retrofits (aka swapping out your old noisy fan).
What to look for:
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Retrofit kits (ideal if you’re replacing an older unit)
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Mounting brackets and clear instructions
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4 or 6-inch duct compatibility
If you’re handy, you can install it yourself in a couple of hours. If not, it’s worth hiring a pro—especially when wiring humidity sensors.
📐 6. Size & Fit (Don’t Skip This!)
Not all fans fit all ceilings. Before buying:
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Measure your existing housing (cut-out size).
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Check for attic access—some models require it.
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Confirm duct size—most use 4-inch or 6-inch ducts.
Heads up: Installing a high-powered fan on a small duct can lead to loud operation or reduced performance.
💡 7. Bonus Features to Consider
Want to go the extra mile? Look for:
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Timers: Automatically shuts off after 15–60 mins.
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Adjustable Speed Settings: Custom control over airflow.
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Integrated LED Lighting: Great for small bathrooms or powder rooms.
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Night Lights: For late-night trips without the blinding glow.
🛑 Watch Out For…
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Fans with no humidity sensor – These require manual control (which defeats the point).
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Noisy budget fans – You might save $20 but regret it daily.
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Non-ENERGY STAR units – These cost more to run and are less efficient.
🧼 Why a Good Bathroom Fan Really Matters
Here’s the thing—bathrooms are moisture magnets. Without proper ventilation, you risk:
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Mold & mildew growth
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Peeling paint and wallpaper
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Musty odors
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Even structural damage over time
And let’s be real—nobody likes showering in a foggy, stuffy space.
A quiet exhaust fan with a humidity sensor keeps things fresh, dry, and damage-free automatically.
✌️ Final Words
If you’re done dealing with noisy, ineffective bathroom fans, a quiet one with a smart humidity sensor is the upgrade you didn’t know you needed.
👉 Want whisper-quiet? Go with the Broan-NuTone QTXE110S.
👉 Need power? Check out the Homewerks 7136-02HW.
👉 Tight on space? The Delta BreezSlim is made for you.
No more foggy mirrors or moldy walls—just quiet, clean air done the smart way.
