Why Your Dehumidifier and Shipshape App Show Different Humidity Numbers
The Short Answer
A 2% difference between your dehumidifier display and the Shipshape app is completely normal. Both readings are correct for where each sensor sits in the room, and anything within a 5% spread means your home is operating exactly the same either way.
Here is why the numbers do not match, and when a gap is actually worth a closer look.
Two Sensors, Two Spots in the Room
Your dehumidifier reads the air right next to itself, usually within a few inches of where it pulls air in. That spot tends to run a little drier because the unit is actively removing moisture from the air closest to it.
The Shipshape sensor lives somewhere else in the room, often on a wall or shelf. It reads the average humidity of the wider space, which is what actually affects your comfort, your wood floors, and your air quality.
Both numbers are true. They just measure slightly different pockets of air.
Consumer Sensors Drift a Little
Every humidity sensor on the market has a tolerance, and consumer-grade humidistats (the kind inside most dehumidifiers, thermostats, and small monitors) are typically accurate within plus or minus 3 to 5%. Lab-grade meters run plus or minus 1%, but you would not put one in your living room.
That tolerance is normal, expected by the manufacturer, and built into how these devices are designed to work. A 2% gap between two consumer sensors is well inside the margin both devices advertise.
What Counts as a Healthy Range
For most homes, 30 to 55% relative humidity is the year-round comfort and health zone:
- Below 30%: dry skin, static, hardwood gaps, irritated sinuses
- 30 to 55%: the sweet spot for comfort, sleep, and protecting your home
- Above 60%: mold risk, dust mites thrive, that "sticky" summer feeling
If both your dehumidifier and the Shipshape app are showing numbers inside that 30 to 55% band, your home is doing exactly what it should, regardless of which device you check.
How Shipshape Uses the Reading
Shipshape watches humidity for trends and alerts, not for absolute precision. The app cares whether your humidity is rising over a week, dropping suddenly, or climbing past a level that signals a leak or a failing dehumidifier. A 2% offset in the absolute number has zero effect on any of that.
Think of it like a weight scale that reads two pounds high. It still tells you, accurately, whether you are gaining or losing.
When the Gap Actually Matters
A real signal looks different from a 2% offset. If you see all three of these at once, it is worth a service request:
- The gap between your dehumidifier and the app is consistently over 10%
- It shows up in multiple rooms, not just one
- It persists across multiple days, not just one afternoon
That pattern can mean a sensor has drifted out of spec, your dehumidifier is struggling to keep up, or there is a hidden moisture source somewhere in the home.
When to call your contractor
Reach out to your home service provider if your indoor humidity sits above 60% for more than a day, drops below 25% during heating season, or if you notice the gap between devices growing wider over several weeks. They can check sensor calibration, dehumidifier performance, and look for hidden moisture sources before any of it becomes a bigger problem.
Still have questions? Open the Shipshape app and ask Sal, or reach out at support@shipshape.ai.