HomeInOn – Humidifiers in your home or workshop
Humidity levels that are too high or too low can play havoc in your home or workshop. Ideally, you want the relative humidity level in your home or shop to be in the 30% to 50% range year-round, with a sweet spot of around 40%. As winter approaches and we begin turning up the heat and closing a lot of windows, humidity levels tend to drop. The air gets drier (think scratchy throat and dry skin), static shocks increase (particularly if you have carpeting) and it can seem colder even when you’ve set the thermostat higher. And if you have asthma or eczema, symptoms can start to escalate. Lumber in the shop and wooden furniture in the home can shrink, split or warp. To keep track of changing humidity levels in your home use a hygrometer. To increase humidity in your home or shop use a humidifier
A tabletop humidifier, like this Levoit Classic 300S, is a great middle ground when it comes to portability and function. Some models can be controlled via a smartphone app. (Photo by Levoit)
A console unit will give you a much longer run time than smaller humidifiers, though it isn’t as easy to move around the house and it takes up more space. (Photo by AIRCARE)
Installed for Good
Although the purchase and installation costs make this approach the most expensive, you’ll never need to worry about refilling or moving personal or tabletop units around the house. (Photo by Adobe Stock Images)
Types of humidifiers
Evaporative humidifiers are probably the most common and come in two types: cool mist and warm mist. They’re simple machines consisting of a box that contains a reservoir of water, a wick (or filter) and a fan. The wick absorbs water, the fan blows air across the wick and expels the moisture-laden air into the room. These are referred to as “cool mist” humidifiers.
A “warm mist” humidifier has an internal heating element that boils the water that disperses as steam. The boiling kills most waterborne bacteria and mould. And because the process creates steam they don’t use fans, making them quieter to run. However, you may want to avoid these if there are young children in the home as they can topple over and burn tender skin.
An ultrasonic humidifier uses ultrasonic vibration to create a super-fine cool mist. Like warm mist humidifiers they don’t use fans, but they do produce a fine white dust from the minerals present in your tap water. The dust settles around the room. Using distilled water can substantially reduce the dust.
If you can’t decide between a warm and cool mist humidifier you’re in luck; some models feature both warm and cool mist capabilities in one unit.
Formats to choose from
Evaporative and ultrasonic humidifiers are available in personal, tabletop (a.k.a. desktop) and console (a.k.a. floor) sizes. All three are essentially portable humidifiers and can be carried or rolled around the home. While they all perform the same basic function of humidifying the air, they can have a range of additional features, including an empty-tank indicator, wick replacement indicator (for cool air evaporative models), automatic shutoff, remote control, night light, diffuser (which emit essential oils into the air), UV light (which destroys microbes and bacteria and can also de-chlorinate and de-ozonate the water), and built-in humidistat (which monitors the room’s humidity level and shuts the unit off at a pre-chosen humidity level).
Whole house (furnace-mount) humidifiers are available in evaporative and steam formats.
The personal model is best when used up close and personal. They have the smallest tank sizes, generally under a litre. Some have multiple speed settings. Higher speeds deliver more humidity but can significantly decrease the run time before you need to add more water to the unit. The Evapolar, for example, which I use at my desk, needs refilling every three hours or so on its high-speed setting, and every seven or eight hours on its lowest speed setting. Some personal models can be powered from a USB port on your desktop computer or smart device.
Desktop models are suitable for small rooms up to a few hundred square feet. Most are in the two- to four-litre tank size and can run for up to 15 hours at the slowest speed setting without needing to refill the tank. They’re available in an astounding range of shapes and colours to suit your decor.
A console model is better suited for large rooms. They’re available in a wide range of tank sizes and are a good choice if you live in an apartment, condo or house with an open-floor plan. If you live in a multi-storey house you’d want one for each floor, or at least a model with casters or handles so you could easily move it around the house. Choose a model rated for the square footage of the largest room you’ll use it in.
If you don’t relish moving a console humidifier from room to room and you have a house with a heating duct system, consider installing a furnace-mount humidifier. They connect to your home’s heating and air-conditioning system, which is usually mounted to a return air duct. Evaporative (flow-through and rotating drum) models are the most popular types, while steam models are less common. A water supply is connected to the humidifier. The water is dispensed over an absorbent evaporator pad. Warm dry air from the furnace passes over the pad, absorbs moisture and then circulates the warm moisture through the duct work. A humidistat (similar to a thermostat that you use to set the heat level) enables you to control the humidity level. Unless you have experience with electrical wiring, water lines and ductwork, installation is best done by a plumber or HVAC technician.
Also known as swamp coolers, evaporative coolers are somewhat similar to humidifiers. They’re either located outside the home or window-mounted. A fan draws in warm outside air and passes the air through a wet evaporator pad. The moistened air loses heat and cooled air is blown into the home. They work best in hot, dry areas where the relative humidity is around 30%. Similar to humidifiers, they do add some moisture to the air.
Moisture breeds bacteria
Regardless of what you hear or read about any of these models, they all need rigorous scheduled maintenance, even ultrasonic humidifiers and those with UV light technology. At the minimum, you should rinse out the tank daily and clean it with a mild bleach solution weekly. Change the wick and any other filters according to the manufacturer’s recommended schedule.
Carl Duguay - [email protected]
Carl is a Victoria-based furniture maker and the web editor at Canadian Woodworking & Home Improvement.