Crawl Space Dehumidifier: Benefits and Considerations

Are you worried about moisture damaging your home and its contents? A crawl space dehumidifier is the perfect solution to protect your property from high humidity and even mold.

Learn more about the benefits and considerations of investing in a dehumidifier for your crawl space.


Crawl spaces can be a source of revitalizing fresh air to your home, but if neglected, they can become extremely damp and prone to mold growth. Investing in a dehumidifier is the best way of controlling moisture in your crawl space. It will help lower humidity levels and reduce the chances of developing mold and other undesirable elements.

In this guide, we’ll take a look at the benefits of installing a crawl space dehumidifier, as well as any considerations you need to keep in mind before investing in one. We’ll also provide some tips on how best to use it effectively. By the end of this guide, you should have a good understanding of how dehumidifiers work and their advantages when installed in your crawl space.

Explanation of what a crawl space dehumidifier is

A “crawl space dehumidifier” is a device specifically designed to help reduce moisture levels in a crawl space. It works by removing moisture from the air, typically through evaporative or refrigerant-based cycles, and pushes it into an internal tank. This helps to decrease humidity levels in the crawl space and protect your home from mold and mildew growth. It can also help to reduce musty odors, which can be caused by damp and uncontrolled humidity levels. Installing a dehumidifier in your crawl space will allow you to maintain a healthier living atmosphere inside of your home, while also eliminating pest infestations that are commonly associated with high moisture levels.

Crawl space dehumidifiers come in many different shapes and sizes, but all have the same purpose—to maintain safe humidity levels in your crawl space area. Dehumidifiers for crawl spaces should be designed to provide effective air circulation around the units themselves without exhausting warm air back into the environment. Many devices can also include sensors that monitor both temperature and relative humidity levels; helping you ensure your device is working correctly without having to manually check on it all the time!

Importance of controlling humidity in crawl spaces

Maintaining a healthy, properly-ventilated crawl space is essential to keeping your home comfortable and reducing energy bills. High levels of humidity in a crawl space can cause a number of problems, including wood rot, mold growth, pest infestation, and other structural damage. The presence of high humidity in the crawl space is difficult to detect as it is not visible to the human eye; however indicators such as dampness, musty odors, or condensation on water pipes may indicate excessive moisture present in the area.

Installing a crawl space dehumidifier can provide multiple benefits. It prevents mold growth by removing excess moisture and helps keep pests away due to drier air. A dehumidifier also reduces energy costs by eliminating air leaks through improved insulation caused by reducing the presence of moisture. Furthermore, it helps protect wood structure and prevents odors from entering into living spaces such as bedrooms. Before choosing a dehumidifier for your specific needs, it is important to consider factors such as size and maintenance requirements along with humidity level reduction capabilities.

Benefits of Using a Crawl Space Dehumidifier

A crawl space dehumidifier has many advantages for both your home and family. Reducing the humidity levels in your crawl space helps to keep out harmful mold, dust mites, mildew, and other allergens that can cause health problems for you and your family.

A dehumidifier can also help to reduce odors by removing excess moisture from the air which helps to keep your home smelling fresher. Additionally, a dehumidifier can help to protect structural components from the damaging effects of moisture and humidity, including mold growth on insulation and wood decay due to fungus.

By reducing the amount of moisture in your home, a dehumidifier creates an ideal environment for maintaining temperatures more consistent with outside conditions. This means that during warmer seasons of the year, air conditioning runs more efficiently since there is less humidity inside the house.

Finally, a crawl space dehumidifier helps to reduce energy costs since it is able to reduce the need for heating or cooling since it’s already helping to create a healthier living environment with fewer allergens in circulation.

Prevention of mold and mildew growth

Preventing the growth of mold and mildew is essential for protecting the health of any home. If left unchecked, mold and mildew can cause a wide range of health issues from respiratory problems, allergic reactions, and even opportunistic infections.

Crawl space dehumidifiers work to reduce the humidity in this enclosed space to reduce the risk of moisture-driven growth. In addition to keeping humidity levels at or below 60%, they can also help by filtering harmful dust particles that can lead to mold and mildew buildup.

Additionally, some models come with control panels that allow you to easily adjust and monitor real-time humidity levels in your crawl space.

Protection of structural integrity of home

A crawling space dehumidifier is an effective way of protecting the structural integrity of your home from the damaging effects of moisture. In a crawlspace, excessive moisture can cause wood rot, mold growth, and even pest infestations. These effects can be particularly damaging if left unchecked and can result in large repair bills and other costly damage to your home’s structure.

By installing a crawl space dehumidifier, you can help prevent this damage from occurring. The unit will pull in moisture from the air and then pass it through an internal filter that removes contaminants before releasing it to the outside atmosphere. This will help keep the humidity levels in your crawlspace comfortable and dry, ensuring that no damage is done to your home’s structure as a result.

Additionally, having a crawl space dehumidifier may also help to reduce allergies that may be caused by excess moisture in the air.

Improvement of indoor air quality

Crawling spaces are often dark and damp, the perfect environment for mold and mildew. Crawl space dehumidification units help to ensure that the air in this part of your home is dry and clear. This reduces the risk of mold and mildew forming, and helps minimize the effects of airborne allergens that can cause coughing, sneezing, and other respiratory infections.

A crawl space dehumidifier is a small appliance designed specifically for this purpose. It draws air from the crawl space into its internal chamber where a set of coils absorb moisture from the air. The moisture is condensed into a collection pan which is emptied periodically by hand or through a hose connection to an outdoor drain system. By maintaining an appropriate relative humidity level (typically between 40%-50%), this device helps to prevent lingering water build up in crawl spaces, which increases potential hazards such as rot, pests, or even mildew infestations.

Installing a crawl space dehumidifier also helps you reduce overall energy costs as well. Because increasing indoor air temperatures requires more energy than reducing relative humidity levels, operating one of these devices will effectively reduce the amount of baseline cooling load required on your heating and cooling system during periods of high external temperatures or humidity levels. It will also ensure adequate circulation in small spaces by helping to remove excess heat buildup or condensation accumulations that could damage stored items or create moldy conditions inside walls or enclosed areas.

III. Considerations When Choosing a Crawl Space Dehumidifier

When choosing a crawl space dehumidifier, it is important to consider the size and design of your particular space. A good rule of thumb is that larger spaces need larger dehumidifiers, but different configurations may require different models. Following are some considerations when selecting the right dehumidifier for your crawl space:

  1. Size of the space: Consider how much air you need to remove per hour and factor in the size of the area in question. This will help you determine which size unit would be most appropriate for your space.
  2. The amount of moisture in the air: Some areas may have higher concentrations of moisture than others so it’s important to know what you’re dealing with before making a purchase decision. If possible, take a relative humidity reading inside the crawling space with a hygrometer and use that information to help choose an appropriately sized unit.
  3. Ventilation requirements: Proper ventilation is essential when considering a crawl space dehumidifier as all heat, moisture and exhaust must be expelled out of the home properly and efficiently in order to ensure long term performance. Be sure to double check any state or local regulations regarding proper ventilation standards prior to installation as this can have an effect on your purchase decision as well as any potential additional costs associated with installation (i.e., ductwork).
  4. Energy efficiency rating: The majority of modern day appliances are designed or configured with energy-saving features such as timers and multi-speed fans for improved energy efficiency rating (EER), which saves money on utility bills over time compared with units without these features. In addition, look for ratings from Energy Star or other third party organizations who measure energy efficiency ratings yearly; these are typically included on labels when purchasing products online or in store locations for greater product comparison visibility during shopping trips or online searches.

Size and capacity

A crawl space dehumidifier is intended to reduce the humidity levels within the space and control mold, mildew, and possibly even pests. To properly regulate humidity in a crawl space, it’s important to assess the size and capacity of your dehumidifier. The size of a crawl space humidifier is based on factors like location, atmospheric conditions, number of occupants, and other variables herein discussed.

As far as determining size goes, the larger the area you’re trying to manage humidity for, the bigger your humidifier must be in order to do its job effectively. Generally speaking, calculate between 9 to 12 liters per square meter (to be more precise). A unit with a sensing device that can monitor temperature and moisture fluctuations within 0.2°C will often have enough intelligence to adjust its own settings as needed.

When it comes to capacity, dehumidifiers are often capable of holding anywhere from 1-3 gallons of water in one tank before needing emptying — this varies depending on make/model/capacity of unit you buy but most have a water removal system that allows it to be connected to a drain. In order to ensure that you are buying an adequate unit for your situation take cognizance of its dampness extracting rate (DER) which indicated how quickly it can reduce relative humidity levels – this should typically measure between 45-70 litres per day for an average-sized room or basement space with normal climate conditions respectively).

Type of dehumidifier

When choosing the right dehumidifier, one of the most important considerations is to choose one that is suitable for use in a crawl space environment. There are several types of dehumidifiers, including:

-Refrigerant dehumidifiers – This type of dehumidifier relies on a refrigeration system to cool the air and condense moisture out of it. This type is usually quite energy efficient, but it may not be suitable in some damp crawl spaces as the moisture will freeze and form an ice barrier on the cooling coils, impeding its ability to function efficiently.

-Desiccant dehumidifiers – These units use a desiccant material that absorbs moisture from the air. They are best suited for crawl space environments as they work well in cooler temperatures and have fewer issues with freezing temperatures than refrigerant units.

-Hybrid systems – As their name implies, hybrid systems incorporate components from both refrigerant and desiccant systems to create a more effective moisture removal process. They are generally more expensive than other models but may be worth it if you’re looking for superior performance in your crawl space.

Installation requirements

Installing a crawl space dehumidifier requires careful consideration in order to ensure that it performs correctly and efficiently. It is important to determine the size of the unit that is appropriate for the space, as an undersized unit will not be able to properly address the humidity issues. A larger unit, on the other hand, can increase energy costs.

In order to properly install a dehumidifier in your crawl space, you should first measure the area to get a general idea of its size and use this information to select the right model. After selecting a model, you should check with local codes and regulations to see if there are any specific requirements for installing a dehumidifier in your particular region or local area.

It is also important to take note of any potential obstructions when planning out where you would like to install your unit, such as overhanging beams or low ceiling heights. In addition, there should be adequate airflow between any nearby obstacles so that air can move freely around them and into the dehumidifier unit’s intake area. Finally, you will need an electrical outlet nearby in order for your dehumidifier to actually operate.

Maintenance and upkeep

To ensure that your crawl space dehumidifier runs optimally, it is important to keep up with regular maintenance and upkeep. Your dehumidifier will require very little regular maintenance, but you should be sure to clean filters, lubricate fans and motors, check for lost insulation and inspect the drainage line on a periodic basis.

One of the most important things to consider when maintaining a crawl space dehumidifier is to make sure that the unit is properly vented. If the unit cannot breathe, mold may become an issue or dust mites may congregate in areas where air re-circulation is not possible. Proper venting can also help ensure that moisture levels are kept under control as well.

Another factor in maintaining your dehumidifier is to monitor how often it needs to run. An overly active compressor can be extremely costly in terms of energy bills and should be monitored regularly for signs of overuse. If you have a tank-style dehumidifier, then you should check routinely for clogs or changes in efficiency that are due largely to age and wear on the unit itself – this will help prevent breakdowns in the future if remedied ahead of time.

Finally, if your unit uses disposable filter media such as paper units then these will need regularly replacing (approximately every six months). It is important to keep an eye on when it needs replacing because a clogged filter will impact performance and force your dehumidifier’s motor to work harder than normal.

Cost and budget considerations

When making decisions about the type of dehumidifier that is best for your property and budget, there are some important factors to consider.

The first factor is the size of the space where you will be using a dehumidifier. A larger space will require a more powerful unit, which means that it may cost more upfront. In general, portable units are cheaper than their built-in counterparts. However, they may need more frequent maintenance and can take up more space in an already-crowded home or basement.

The second factor involves installation costs and labor. Installing a built-in dehumidification system in an unfinished crawlspace can be expensive because of the need to hire a licensed electrician and follow local building codes for wiring and ductwork installation. Portable units are less expensive to install but do require ongoing filter replacements or treatment with salt or silica gel over time to ensure long-term efficiency and effectiveness, along with regular cleaning and upkeep.

Lastly, there are additional utilities costs tied to operating a dehumidifier such as electricity Usage Cost (EUC). EUC refers to both the energy used by the unit itself as well as any energy needed for water discharge or other waste removal associated with managing air moisture levels in your crawl space. It’s important to compare different manufacturers’ models carefully when choosing your system so you know exactly how much EUC you’ll need to cover in order to keep your environment clean and comfortable over time.


Overall, installing a crawl space dehumidifier can be beneficial for homeowners as it can help protect their home from dampness and mold. A dehumidifier can also help improve indoor air quality, reduce energy costs and decrease the chances of mildew and other allergens forming. Additionally, it can help reduce the overall humidity level in the home which leads to improved overall comfort.

When shopping for a crawl space or basement dehumidifier, there are many important considerations to take into account including, size and capacity of the unit, efficiency ratings, and price. Consideration should also be given to airflow requirements, noise levels and installation considerations such as ductwork access. Lastly, when selecting your unit you should make sure it is appropriate for use in a damp indoor environment.

Installing a crawl space or basement dehumidifier is not without its drawbacks to consider including increasing your energy bill if you choose an inefficient model that requires more energy to run than necessary and having to periodically drain water out of your dehumidifying condensate tank or plumb the unit directly into a drainage system if your basement doesn’t have appropriate waterproofing measures in place.

In conclusion, with adequate research you should be able to determine whether or not installing a crawl space or basement dehumidifier is right for you based on weighing the benefits against what it might cost you in terms of additional bills for electricity and potential maintenance needs down the line.

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