You’ve had a whole-home humidifier installed — great decision for an Edmonton winter. Now comes the practical question: what humidity level should you actually set it to? Too low and you’re not getting the benefits. Too high and you risk condensation on windows and walls, which can lead to moisture damage and mould.
Here’s how to find the right balance for your home through the season.
The Recommended Range
Health Canada and most HVAC professionals recommend maintaining indoor relative humidity between 35% and 50% for comfort and health. Within that range, your mucous membranes stay moist, static electricity is minimized, and your home’s wood and finishes are protected.
In the dead of an Edmonton winter, staying at the lower end of that range — around 35% — is often more practical, as extremely cold outdoor temperatures make it harder to maintain higher indoor humidity without condensation forming on windows.
Why Outdoor Temperature Matters
The colder it is outside, the lower you need to set your humidistat to avoid condensation on your windows and exterior walls. When warm, humid indoor air meets a cold surface (like a window in January), the moisture condenses — and over time, that can damage window frames, walls, and insulation.
A general guide for Edmonton homes:
- Outdoor temp above -10°C: Indoor humidity up to 40–45%
- Outdoor temp -10°C to -20°C: Indoor humidity 35–40%
- Outdoor temp below -20°C: Indoor humidity 30–35%
These are starting points — your home’s insulation, window quality, and construction all affect the right setting. Watch your windows: if you see condensation forming on the glass, dial back the humidity slightly.
How to Read Your Humidistat
Your humidistat works like a thermostat — you set a target relative humidity percentage, and the system maintains it. Most whole-home humidifiers installed with your furnace will have a simple dial or digital control. Some newer thermostats include humidity control built in.
If you’re not sure where your humidistat is located, it’s usually mounted on the return air duct near the furnace, or on the furnace itself.
Seasonal Adjustments
The right humidity setting changes through the year. In winter, you’ll be running the humidifier regularly and adjusting based on outdoor temperatures. In spring and fall, you may run it occasionally. In summer, most whole-home humidifiers are turned off or set to a bypass mode — Edmonton summers don’t typically require added humidity, and high summer humidity can cause its own problems.
Your technician will walk you through seasonal settings when your humidifier is installed. And if you have questions at any point, we’re always happy to help.
Signs Your Humidity Is Too Low
- Static shocks when touching metal surfaces
- Dry skin, chapped lips, or irritated sinuses
- Wood floors or furniture starting to crack or gap
- Increased allergy or asthma symptoms indoors
Signs Your Humidity Is Too High
- Condensation on windows, especially overnight
- Musty or damp smell in certain rooms
- Frost forming on window edges in very cold weather
Dialling in the right setting usually takes a couple of weeks of adjustment at the start of heating season. Once you find your home’s sweet spot, it’s easy to maintain.
Questions about your humidifier settings? Call Total Duct Cleaning at (780) 670-0400 or reach out online — we’re happy to help.
