The Edit — Health & Wellness
The Right Indoor Humidity in Winter, and How to Check It
Hold a home between 30 and 50% relative humidity, by the EPA's and Mayo Clinic's figures. How to measure it, what too much looks like, and 2 hygrometers and a humidifier to get there.
This guide is research-led: we have not handled these units ourselves. If you buy through our links we may earn a commission — it never changes a pick.Research-led, nothing handled. We may earn from links; it never changes a pick. How we choose
This page sets out the indoor humidity range the EPA and Mayo Clinic give, how to measure it, and the meters and humidifier that follow from it, chosen as How we choose describes. Nothing here was handled or tested.
TempPro TP50 Digital Hygrometer Indoor Thermometer
Good fit One reading per room, at a glance
Not for A unit that fails early, which some owners report
Govee Indoor Hygrometer Thermometer H5075
Good fit Seeing how humidity changes overnight
Not for Bluetooth range and accuracy, which split owners
Levoit Top Fill Humidifier, 2.5L Tank
Good fit A bedroom that reads below 30% in January
Not for Hard tap water, which leaves white dust
Indoor humidity belongs between 30 and 50%
The EPA advises keeping indoor relative humidity below 60%, and ideally between 30 and 50%. Mayo Clinic gives the same 30 to 50% range, and notes that humidity tends to fall in winter. Below the range, dry air can irritate sinuses and crack lips. Above it, mold and bacteria get the moisture they need.
A hygrometer is the only way to know the number
Nobody can feel the difference between 35 and 55%, so measure it. The EPA describes a humidity meter as a small, inexpensive instrument sold at many hardware stores. The TempPro TP50 shows humidity and temperature in large figures and rates 4.6 across 155,932 ratings. Owners call it accurate, compact and easy to read. Some report a unit that failed within a month.
TempPro TP50 Digital Hygrometer Indoor Thermometer
A small digital display of room humidity and temperature, with large figures.
Current price shown on Amazon. We may earn a commission.
| Shows | Humidity and temperature |
|---|---|
| Connection | None, display only |
Owners praise the large, readable figures and the small size. A minority had one stop working early.
Buy it if
- One reading per room, at a glance
Don't buy it if
- A unit that fails early, which some owners report
The Govee H5075 adds a Bluetooth app to its display, so humidity can be seen across a night or a week. It rates 4.5 across 48,567 ratings. Owners find it easy to set up and good value. Bluetooth range and accuracy draw mixed reports.
Govee Indoor Hygrometer Thermometer H5075
A hygrometer with a display and a Bluetooth app that keeps a history.
Current price shown on Amazon. We may earn a commission.
| Shows | Humidity and temperature |
|---|---|
| Connection | Bluetooth app |
Owners like the easy setup and readable screen. Bluetooth and accuracy split them.
Buy it if
- Seeing how humidity changes overnight
Don't buy it if
- Bluetooth range and accuracy, which split owners
Wet windows are the EPA’s sign of too much humidity
Condensation on windows, walls or pipes is a sign of high humidity, per the EPA, whose indoor ceiling is 60%. In a cold snap, water beads first on the coldest surface in the room, which is usually the glass. Treat wet windows as an instruction to turn the humidifier down, vent the bathroom and kitchen, and dry the frame.
Raise a dry room with a humidifier, and keep it clean
A humidifier is the fix for a room that reads below 30% for weeks. The Levoit Top Fill 2.5L suits a bedroom: listed at 25 dB, filled from the top, at 4.4 across 64,149 ratings. Owners praise how quiet and easy to clean it is. Mayo Clinic’s advice applies to every humidifier: use distilled or demineralized water, change the water daily if possible, and clean it every 3 days.
Levoit Top Fill Humidifier, 2.5L Tank
A 2.5-litre top-fill ultrasonic humidifier listed at 25 dB.
Current price shown on Amazon. We may earn a commission.
| Tank | 2.5 L |
|---|---|
| Type | Ultrasonic, cool mist |
Owners call it quiet and easy to fill and clean. Distilled water keeps white dust off the furniture.
Buy it if
- A bedroom that reads below 30% in January
Don't buy it if
- Hard tap water, which leaves white dust
Humidifiers compared sets 7 machines side by side, and humidifier white dust explains why tap water leaves a film on the furniture.
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Keep reading
Compared
Humidifiers Compared: Bedroom, Large Room, No White DustThe quietest humidifiers leave white dust on the furniture. The ones that don't need filters. Which trade suits you?
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Explainer
Humidifier White Dust: What Causes It and How to Stop ItWhite dust is an ultrasonic problem and distilled water is the only complete fix.
Head to head
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