You can find many uses for a shed in your backyard or garden, from storing tools and furniture to converting it into a home office or a guest room. Whichever way you choose to use your outdoor shed, it’s essential to keep proper humidity levels to protect your items from excessive moisture and its damaging effects. High humidity attracts mold, mildew, and pests and leads to wood rotting and metal rusting. To avoid these problems, you need to reduce humidity with a dehumidifier.
To find the best dehumidifier for your storage shed, garage, or workshop, there are some considerations you must first make. Some factors you need to look for when choosing a dehumidifier include the size and condition of the space and the climate in your area. We’ve listed below the five best options you can choose from as well as the important features for each unit. Keep reading to find out which dehumidifier fits your specific needs.
Dehumidifier for Outdoor Shed Comparison
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Editor's Choice  |
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Best Dehumidifiers for Sheds
Frigidaire FFAD3533W1
Frigidaire offers a wide range of high-quality appliances trusted by homeowners and experts. Our top choice dehumidifier is this 35-pint Energy Star dehumidifier. Frigidaire particularly excels in low-temperature operation down to 41°F without the need for auto defrost control. This dehumidifier removes up to 35 pints of moisture from medium to large size rooms. All Frigidaire units are Energy Star rated to help save money on your bills.
With custom humidity control and a 24-hour timer, you can select your desired humidity level from 35% to 85% and set the dehumidifier to automatically stop or start operation after 0.5 to 24 hours. For maximum moisture removal, it offers three fan speeds: Low, Med, and High, working quietly and efficiently. It has an easy-to-use control and auto shut-off feature that automatically turns off the unit when the large 2-gallon tank is full.
Frigidaire’s SpaceWise design includes a front-loading bucket with a handle and splash guard, four caster wheels, and a handle on top for portability and easy movement. For more convenience, use the continuous draining option by attaching a standard garden hose to the drain outlet and directing it to a low-level drain or sink. The unit also comes with a washable filter that helps reduce dust and bacteria in the air.
If you get cold winters in your place and need a powerful and reliable dehumidifier for your shed, Frigidaire might be the wisest choice for you. Although, note that it’s not the most affordable for its size. It’s also available in a smaller 22-pint unit and larger capacities up to 60 pints.
Pros
• Works in low temperatures
• Energy Star certified
• High tank capacity
• SpaceWise design
• Continuous draining option
Cons
• Higher price
• 1-year warranty
hOmeLabs HME020006N
The 35-pint hOmeLabs dehumidifier (previously 50-pint) offers all the features you may need in a residential dehumidifier at a budget-friendly price. It is ideal for medium to large damp rooms between 1,500 and 3,000 square feet. It’s also available in a smaller 22-pint unit or a bigger 50-pint. All hOmeLabs dehumidifiers are Energy Star certified so that you not only save money for your purchase but also when running the unit for a long time.
Operating this unit is made easy with its customizable setting that lets you adjust your desired humidity from 35% to 90% RH. On the control panel, you can set the timer to delay the start or stop operation for 0.5 to 24 hours. You can choose from Comfort, Turbo, and Continuous modes. The Turbo button increases fan speed, Comfort automatically sets humidity and fan speed based on the ambient temperature, while Continuous enables nonstop dehumidification.
hOmeLabs features a simple but functional design complete with wheels and handles that blends perfectly into any interior. This dehumidifier operates in temperatures not lower than 41°F. In case of freezing temperatures, it has auto defrost to protect the machine from frost buildup.
Once the 1.6-gallon tank is full, the unit automatically shuts off and the full tank alert will light up. You can use the continuous draining option with a standard garden hose purchased separately. While it’s a good dehumidifier overall, some may consider it low quality due to the lightweight plastic construction. But if this isn’t a problem for you, then this hOmeLabs dehumidifier is a solid choice.
PROS
• Energy Star certified
• Budget price
• Customizable settings
• Continuous drain option
CONS
• Has to purchase hose separately
• Lower quality build
Pro Breeze Mini Dehumidifier
For tiny spaces with moisture problems, a mini Peltier dehumidifier like this Pro Breeze model can go a long way at only a fraction of the costs for a regular dehumidifier. Pro Breeze uses the Peltier effect or thermoelectric cooling technology for low-energy and whisper-quiet operation. This small dehumidifier can remove up to 9 ounces (250 ml) of moisture per day in any space within 150 to 215 square feet. It has a tank capacity of 16 ounces (450 ml), which can hold at least two days of moisture. It’s perfect for small spaces, whether you’re using your shed as a simple storage space or a home studio.
This dehumidifier works by passing the moist air from the cold side of the Peltier module to the hot side, producing condensate and dryer air. It is easy to operate with only a single button to turn the unit on and off. Pro Breeze features the standard auto shut-off function and full tank indicator light to let you know when the tank is full. To drain the water, simply slide the tank out from the bottom part of the unit, pull the drain plug, and empty the content into your sink or drain.
Running on 23 Watts, you can leave it running all day on hot and humid summer days. On the downside, Pro Breeze, like all other Peltier dehumidifiers is not built for heavy-duty use. They are recommended at temperatures between 59℉ and 86℉. In any case, for most small rooms with minimal moisture, Pro Breeze is one of the most cost-efficient and best-selling mini dehumidifiers you can find.
Pros
• Small, lightweight, and portable
• Low energy consumption
• Whisper-quiet operation
• Simple one-button control
Cons
• Manual draining
• Only ideal for warmer climates
Gocheer Mini Dehumidifier
If you want a “mini” dehumidifier a little bigger than the Pro Breeze unit, this Gocheer mini dehumidifier is a good choice for you. This portable dehumidifier uses the same Peltier technology for efficiency and covers spaces up to 480 square feet. It can remove up to one liter (33 ounces) of moisture per day while the tank can hold two liters (64 ounces).
This unit has the auto shut-off function to prevent water overflow when the tank is full, with the indicator light to tell you when to empty the tank. To drain, simply pull the tank out, open the lid, and empty the water into the sink or drain. This Gocheer Peltier dehumidifier has the usual one-button control found at the back for the power switch along with the light indicators on the front.
It runs on 48 Watts so the unit only consumes a total of 1.15kW of electricity after 24 hours. Compared to other Peltier dehumidifiers, this is one of the larger units you can find for small spaces. However, note that its dehumidification performance still cannot compare to that of the regular compressor dehumidifiers. It’s only good for tiny rooms with moderate humidity issues.
Pros
• Small, lightweight, and portable
• Low energy consumption
• Whisper-quiet operation
• Higher capacity than most Peltier units
Cons
• Manual draining
• Limited operating temperature range
Ecor Pro EPD30 Desiccant Dehumidifier
If you have a garage workshop in your outdoor shed, you may want a professional-grade dehumidifier like the Ecor Pro DryFan desiccant dehumidifiers. This unit is built specifically for harsh environments and colder conditions in crawlspaces and basements. The smallest from this line of commercial and residential desiccant dehumidifiers is the EPD30 which can remove 13 to 17 pints of moisture in spaces up to 500 square feet, or equivalent to 30 pints per day in compressor dehumidifiers.
This desiccant dehumidifier operates efficiently from -4°F to 104°F with a maximum airflow of 53 CFM. Unlike the more common compressor units, this desiccant dehumidifier does not produce any condensate. It can be ducted to release the warm, moist air from the room directly to the outside.
This compact unit uses a three-hole system, which means there is only one fan inside or one inlet for the process air and two air outlets. It features a desiccant rotor that extracts moisture as the air passes through it. After the moisture is removed, some of the dried air is turned around and heated, becoming the reactivation air. Then, the moisture from the desiccant transfers to the warm and dry air which is then vented outside. This system provides better efficiency than the four-hole system in larger units since the second air stream has already been dried and heated.
Ecor Pro is built with a stainless steel interior and exterior resistant to the toughest conditions in crawl spaces and other spaces in homes and commercial areas. The unit self-regulates to ensure maximum efficiency. Furthermore, the unit can be mounted in any orientation, whether on the floor, wall, or ceiling. It also comes with a dust filter that can easily be shaken clean or replaced.
This compact and portable dehumidifier can be easily installed by one person. Additionally, there is an option to connect the Ecor Pro EPHUM24DF humidistat for remote operation. However, note that the costs of buying and operating this dehumidifier are at least twice that of an equivalent compressor dehumidifier.
Pros
• Wider operating temperature range down to -4°F
• Professional grade stainless steel construction
• Lightweight and compact
• Does not produce condensate
Cons
• Higher costs in buying and operating
• May be harder to install
How Humidity Affects Different Materials
Firstly, we define humidity as the amount of water vapor present in the air. As long as there’s water and air in the space, there’s always humidity. We measure the relative humidity or the actual amount of moisture present in the air compared to the maximum amount the air can hold at a given temperature. The ideal relative humidity range from 30% to 50% for indoor spaces. Beyond this and it can lead to a variety of issues in your health and the structure of your room.
How Humidity Affects Wood
Most sheds are built with wood and this is one of the most vulnerable to excess humidity. Wood is a porous organic material that easily absorbs and releases moisture from the air.
Over time, low humidity can cause wood beams and furniture to dry out and crack. Wood also loses moisture and shrinks in size. On the other hand, in high-humidity environments, wood absorbs moisture and expands. As temperatures and humidity fluctuate, moisture gets trapped in the wood fibers, causing the wood to warp.
Furthermore, mold and mildew thrive in humid environments, growing on wooden walls, ceilings, furniture, and any other moist surface, damaging furniture, equipment, and other belongings. Excess moisture can also result in rotting wood and termite infestation.
How Humidity Affects Metal
Metals are excellent heat conductors. They easily absorb heat from warm bodies and transfer it to cold objects. So when the temperature abruptly changes, the temperatures of metal surfaces also fluctuate along with it. As the cold metal cools down the moist air that comes into contact with it, condensation forms on the metal surface. When moisture collects on the surface, it oxidizes and turns to rust. Not only is it unpleasant to look at, but rusting can also affect the performance of equipment and tools made of metal.
What Humidity Level You Need for Outdoor Storage
Even if you only use your shed for the storage of seasonal appliances, tools, and other equipment, it is still important as any part of your house. Since it’s outside and probably not reached by your central air, it’s vulnerable to sudden changes in temperatures. When the warm air inside is cooled down and reaches dew point, moisture condenses,
High humidity promotes the growth of mold, mildew, and dust mites. It is not a pleasant sight or smell, and it is harmful to your health as well. These airborne allergens can trigger allergic reactions, asthma attacks, and other respiratory conditions. The good news is you can eliminate them from any space in your home if you maintain the humidity levels around 40% to 50% RH.
To do this, you need to find the best garage dehumidifier that can keep your space with proper humidity levels. In most cases, only a dehumidifier can solve your moisture problems right at the source and get rid of musty odors.
Types Of Dehumidifiers and How They Work
Dehumidifiers come in a wide range of sizes and use different moisture removal methods. The two main types of dehumidifiers are often classified between desiccant and refrigerant. Before choosing a dehumidifier, it’s important to understand how they work so you can choose the right type for your needs.
Refrigerant dehumidifiers are what most homeowners may be familiar with. This type uses a compressor to pump the refrigerant to and from the condenser and evaporator coils. As the air enters the unit, it passes through the cold coils where the moisture from the air condenses into water. This water is collected in the dehumidifier’s tank. Then, the air is warmed up before it’s exhausted into the room.
Refrigerant dehumidifiers typically work best in warm and humid climates. The standard capacity today ranges from 20 to 50 pints. In temperatures below 41°F, most units will stop running. When frost is detected on the coils, the compressor will stop while the fan melts the ice completely before resuming operation.
Another dehumidification method that is commonly used in mini dehumidifiers is called the Peltier effect or thermoelectric cooling. It consists of a Peltier module with one cold side and another hot. Moist air is drawn into the unit through a small fan and then passes the cold side of the Peltier. This is where the moisture condenses and then drips down into the tank. The cold, dry air goes to the hot side, and then warmer, dryer air is released into the room.
Like the common refrigerant dehumidifier, a Peltier dehumidifier works best in warm and humid climates, typically between 59°F and 86°F. However, compared to regular dehumidifiers, Peltier units have lower capacities, removing around 8 to 10 ounces of moisture daily for the smallest models or up to 25 ounces per day for the largest one.
The other type of dehumidifier, called desiccant, uses some kind of hygroscopic chemicals that absorb moisture from the air through absorption or adsorption. It comes in many different sizes depending on the type of desiccant used. For non-renewable or disposable dehumidifiers, more commonly called moisture absorbers, moisture is simply collected inside a container. When it’s full or the desiccant itself is used up, you just need to throw it out and replace it after one use.
Renewable desiccants may come in a mini rechargeable dehumidifier or a full-sized unit similar to regular compressor dehumidifiers. They use silica gel which extracts moisture from the air until it has reached full capacity. In which case, it simply needs a recharge by heating. Unlike moisture absorbers, renewable dehumidifiers produce no liquid and can be used for years. Full-size desiccant units have a smaller capacity and coverage area than the equivalent compressor dehumidifiers. They are also much cheaper to buy and operate. The main advantage of using a desiccant dehumidifier is its ability to work in lower temperatures since it doesn’t produce condensate.
How to Find the Best Shed Dehumidifier
Choosing the best dehumidifier for your specific needs may be overwhelming with all the models available today. Consider the following essential features when looking for a dehumidifier to make sure you get the most out of your investment.
Moisture Extraction Rate
This is the maximum amount of moisture that your dehumidifier can remove from the air in 24 hours, typically measured in pints or ounces per day. If the space is extremely damp, with humidity levels reaching above 70% on the regular, you may need a more powerful dehumidifier. This is usually the most important factor to consider and must be on your top priority. Getting the right dehumidifier size ensures it can accomplish its task efficiently. However, it doesn’t mean the highest capacity is always the best.
Coverage Area
Consider the dimensions of your shed and compare it with the manufacturer recommened coverage area for the dehumidifier. A standard 35-pint dehumidifier (previously 50-pint) is usually recommended for spaces around 1000 to 3000 square feet. Larger capacities (50-pint to 70-pint) can reach up to 4500 square feet. Mini Peltier dehumidifiers can cover anywhere from 150 to 500 square feet. Depending on the size and condition of your space, there is the best dehumidifier size for you.
Water Tank Capacity
Dehumidifiers collect moisture in the tank on the bottom half of the unit. The dehumidifier stops automatically when this tank is full of water. Then, you need to empty this water by hand before the unit resumes operation. If you don’t want to have to empty the tank frequently, choose a dehumidifier with a bigger tank capacity. Usually, a higher capacity dehumidifier has a larger water tank than a lower capacity unit within the same brand. However, the same size dehumidifiers from different brands can have varying tank capacities.
If you don’t want your dehumidifier to run continuously and not spill water in the process, you need to empty the tank multiple times a day. Unless you plan to hang out in your shed all day, this can be inconvenient. The best solution is to use a dehumidifier with continuous draining options so you can simply leave it running without any worries.
Drainage Options
Your default draining option for most portable dehumidifiers is through manual draining of the internal tank. The standard 50-pint unit has an average water tank capacity of 1.6 to 1.8 gallons or 13 to 15 pints so you need to empty the tank at least once or twice a day. When using a dehumidifier in a highly humid region, you may want to consider other drainage options.
Most compressor dehumidifiers give you an option to drain the moisture collected continuously through a drain hose so you won’t need to check the water tank and empty it by hand every few hours. Just attach a drain hose (which may not be included with the unit) to the outlet, place the dehumidifier above the drain, and let gravity do the work for you. The third option is continuous draining through a built-in pump so there is no need to rely on gravity. The pump will draw the water out and the drain hose may be positioned vertically up to a certain height to any suitable location.
Commercial-grade desiccant dehumidifiers like the Ecor Pro do not need drainage since they do not produce any condensate. Although, you may need ducting to release the moist air outside.
Low-Temperature Operation
You must also consider the temperature in your shed. Some dehumidifiers may work well at 80°F but shut off when temperatures near 56°F. This is to be expected in common dehumidifiers. However, they have an automatic defrost control to protect the internal components from frost and potential damage. If you live in a cold area or your shed gets cold all year round, you may want to invest in a desiccant dehumidifier specifically designed to operate at low temperatures.
Portability
This is especially important if you have a small shed and only need a dehumidifier seasonally or if you want to use your dehumidifier in multiple areas of your home. Most dehumidifiers are portable enough to be moved across rooms and even up and down the stairs. Larger units come with wheels and handle for easy movement.
Extra Features
Most dehumidifiers include the same standard features including auto shut-off, auto restart, and auto defrost functions, as well as the LED indicator lights necessary. They also feature a digital display that shows the current humidity and the set humidity. The built-in humidistat automatically adjusts the room humidity to your preferred setting. Peltier units and the Ecor Pro desiccant model above only have one function button to turn the dehumidifier on and off. Usually, larger dehumidifiers offer more advanced features but it varies per brand and model. All of the standard features you need in a residential dehumidifier are included in the models we picked. You can also look for solar-powered dehumidifier options available for you.
Conclusion
High humidity can cause discomfort at best, and cause health problems and structural damage at worst. Don’t forget to let in fresh air occasionally to promote good air circulation. If you want to maintain your best health and comfort when using your outdoor shed for whatever purpose, it’s essential to keep humidity levels within the ideal range. One effective way to do this is by using the right dehumidifier in your shed. There are many portable units you can choose from for every size and type of space. Look at the dehumidifier capacity, coverage, drainage options, and other useful features you need for your use. Consider all the important factors we discussed or simply take your pick from the best shed and garage dehumidifiers we listed above.
