Crawl Space and Whole Home Dehumidifiers

 

 

NXT60 Crawl Space and Whole Home Dehumidifier

The WatchDog NXT60 is the smallest dehumidifier in the NXT series, yet it is still capable of maintaining most crawl spaces with a coverage area of 11,000 cubic feet. The effecient NXT60 can produce 60 pints per day at 2.45 L/kWh. Even more impressive, the NXT60 is only 12 inches tall, making it easy to fit in the smallest of spaces.

The WatchDog NXT60 is a gravity drain dehumidifier with a simple to use digital display plus side panels for easy access. It also features auto restart, electronic defrost, and low-temperature operation. In addition, the NXT60 can be used with optional upgrades such as a remote control, an environmental monitor, or duct kits.

 

NXT85 Crawl Space and Whole Home Dehumidifier

The WatchDog NXT85 is the same compact size as the NXT60 but it produces a powerful 85 pints per day. This is perfect for extra large crawl spaces as it can maintain up to 15,000 cubic feet. The efficient dehumidifier only uses 5.3 amps and produces 59 dBa.

The NXT85 features a gravity drain system and comes standard with a MERV-10 filter. Other features of the NXT85 include a digital display for quick set up and side panels for easy access. Plus, the unit comes standard with upgrades like auto restart, and electronic defrost. The NXT85 can also be customized to your needs with options such as an environmental monitor, duct collar kit, or a remote control.

NXT85c Crawl Space and Whole Home Dehumidifier

The WatchDog NXT85c is identical to the NXT85 except for one feature. The NXT85c includes an integrated HVAC quality condensate pump with a 15’ lift. This makes installation a breeze and allows you to use the dehumidifier in spaces where a gravity drain is not an option.

The compact NXT85c includes features such as temperature controlled defrost, auto restart, and a digital display. It also features side panels to make maintenance as easy as possible. Just like the other dehumidifiers in the NXT series, the 85c can be used with many optional upgrades such as an environmental monitor, wired remote control, or duct collar kits.

 

NXT120 Crawl Space and Whole Home Dehumidifier

The WatchDog NXT120 is one of the largest models in the NXT Series. With an impressive 120 pints per day capacity, the NXT120 is perfect for spaces up to 21,000 cubic feet. Despite its powerful capacity, the 120 maintains 2.8 L/kWh and is only 16 inches tall.

The WatchDog NXT120 dehumidifier features a gravity drain plus an easy to use digital display. Simply use the display to choose your desired set point and the built-in humidistat will maintain the area. The unit also includes auto restart, low-temperature operation, and can be easily ducted on both the inlet and outlet sides.


 

NXT120c Crawl Space and Whole Home Dehumidifier

The WatchDog NXT120c has the same 120 pints per day capacity as the NXT120. What sets the unit apart, is its built-in heavy-duty condensate pump. The pump is capable of 15 feet of lift, giving you more options when setting up your drain line. The pump combined with an intuitive digital display and compact size makes installation ultra simple.

With its large capacity, the WatchDog NXT120c can easily maintain spaces up to 21,000 cubic feet. This makes it the perfect unit for a variety of situations including crawl spaces, basements, or HVAC tie in. In addition, the NXT120c can be used with optional accessories such as our wired remote control or wireless environmental monitor.


 


Why Do I Need a Dehumidifier?

When the humidity level gets too high, it leads to increased moisture and dampness throughout your home. If left unattended, this creates the perfect environment for rapid mold growth. While mold may be a natural part of the outside environment, it is not something you want infesting your home or crawl space.

Mold consists of microscopic spores that spread by floating through the air in search of organic materials to feed on. These materials, such as dirt or dust, are most commonly found in dark, damp, and humid spaces, like your crawl space. As the mold spores feed, they continue to grow and spread.

The best way to limit the rapid growth of mold is to control the humidity in your living space. By installing a crawl space dehumidifier in your crawl space, you can reduce the overall humidity of your home. This, in turn, will create a well-maintained environment and discourage mold growth.

One problem with not controlling the humidity in your home is that the excess humidity creates a damp environment that's perfect for pests. Bugs need moisture to survive so they’re always looking for sources of water. If your crawl space has a couple of puddles or a few leaking pipes, it’s going to be attractive to all sorts of pests from mosquitoes to centipedes. Once pests have invaded your home, it can lead to countless problems. For instance, the termites exploring your home are going to start eating any wood they can find, such as floorboards or ceiling joists. You could have a similar problem if wood boring beetles start making themselves at home. As their name suggests, wood-boring beetles make tunnels in wood. If ignored, this type of destruction can lead to severe structural damage in your home as the floors, walls, and foundations are compromised.

Obviously, pests can become quite the nuisance in your home so the question is how to get rid of them? There are a few things you need to do to prevent excess moisture and therefore, discourage pests from making themselves at home. One of the most important factors for a pest-free home is to maintain a controlled humidity level. A crawl space dehumidifier can easily accomplish this task for you.

Prior to the installation of your crawl space dehumidifier, there are a couple of other steps you should take. First, make sure to take care of any lingering issues in the crawl space, such as leaking pipes or standing water. In addition, your dehumidifier can only be effective if installed in a completely sealed crawl space. Not only does this help your dehumidifier, but it also limits the number of entry points for bugs. Another helpful way to get your crawl space ready for a dehumidifier is to encapsulate the space. The encapsulation process involves covering the ground of the crawl space in a polyurethane, plastic coating. This serves to keep out pests and moisture from the ground and makes your crawl space dehumidifier even more efficient.

One of the most obvious reasons for buying a crawl space dehumidifier is to improve the air quality of your home. Without a dehumidifier to maintain the environment, you may be forced to deal with high humidity and all of its issues. When your home is too humid, it often feels clammy and stuffy, which can create an uncomfortable living situation. In addition, poor air quality can aggravate medical issues, like asthma or allergies. Furthermore, if the humidity persists and leads to mold or mildew, this creates severe health problems for the occupants.

If you’re not quite sure if your home is experiencing high humidity, look for signs such as condensation in windows, peeling paint, or warped floors. Too much humidity also makes it difficult for your HVAC to maintain its desired temperature so if you start to notice higher utility bills, excess humidity could be the problem.

One of the best ways to prevent these issues is to control your crawl space environment. Believe it or not, the air quality of your crawl space affects your entire home thanks to the stack effect. The stack effect is an air movement principle that explains the movement of air in and out of buildings. It states that warm air will be drawn into the crawl space and rise upwards. As the warm air rises, the moist, humid air lingering in your crawl space will be pulled with it and spread throughout the home. The good news is that by installing a crawl space dehumidifier, you can take care of that humid air and prevent the stack effect.

Not only can high humidity be harmful to people but, it also has a negative effect on the condition of your home. Excessive moisture from humidity can create a multitude of problems for the structure of your home. These problems often start out small such as condensation buildup in windows or doors that don’t align properly. Gradually, these problems will worsen and may turn into structural problems like wood rot, sagging floors, or subfloor damage.

All of these issues start with excess humidity so, in order to prevent them, it’s essential to maintain the proper moisture level in your home. The best thing to do is to install a crawl space dehumidifier. With the help of its built-in humidistat, the dehumidifier will be able to easily maintain your desired humidity level.


The Ultimate Guide to Buying a Dehumidifier




Here at Seaira Global we want to make buying a dehumidifier as easy as possible. It can be a complicated process with so many different models on the market. Because of that, we have created this guide to ensure that not only do you understand dehumidifiers, but that you can make an informed decision on which model will work best for you

WHY DO I NEED A DEHUMIDIFIER?

Dehumidifiers protect your home and family from unwanted problems

If the humidity gets too high in your home, it not only affects the people living in it but also the condition of home itself. In both cases, too much moist, humid air can cause serious issues.

Excess humidity can make your home quite uncomfortable for you and your family. You may start to notice that it always feels clammy inside or that there’s a musty odor in the area. In addition to discomfort, high humidity can exacerbate medical conditions, such as asthma or allergies. Over time, excess humidity can lead to mold or mildew problems, which can pose serious health problems, as well.

Besides affecting the people in it, high humidity also has a harmful effect on the condition of your home, especially the structural integrity. For example, you may start to notice that doors don’t align properly or that that there’s always condensation in the windows. If ignored, excess humidity can cause larger problems, such as wood rot or sagging floors.

The structural issues can be worsened by external factors like mold and pests, that are attracted to the damp, moist areas of your home. For instance, mold spores are most often found in wet, humid spaces. As the mold feeds and grows, it can weaken the structure of the home. This is also true for pests such as termites, centipedes, silverfish, and mites. Insects need water to survive and are always looking for moist areas. Once inside, pests can severely damage the wood throughout your house.

High humidity compromises the longevity of your home and the health of the people living there. The good news is that installing a Seaira Global dehumidifier can help maintain a consistent humidity and help prevent these issues.



UNDERSTANDING HUMIDITY

Understand the difference between absolute and relative humidity

Before buying a dehumidifier, it’s helpful to understand a little bit about humidity. If you’ve ever been to an area with high humidity then you’re familiar with going outside and experiencing the heavy, muggy feeling that lingers in the air. Unfortunately, humidity doesn’t just stay outside since high humidity and all of it’s problems can spread throughout your home, too.

Most of the time humidity is referred to as either a relative or an absolute humidity. Absolute humidity is the mass of water vapor in the air divided by the mass of dry air that is in a volume of air at a specified temperature. The result of this is that the hotter the air, the more water it can contain. On the other hand, relative humidity refers to the ratio of the highest possible humidity in the air compared to the current absolute humidity. For example, if an area has a relative humidity of 100 percent then the air currently contains as much water as possible. Since the air can no longer hold water at 100% humidity, rain is created.

There is a reason that humans are particularly susceptible to high humidity. The way our skin works, it relies on the air to get rid of excess moisture. When we sweat, that is our bodies way of trying to keep cool and maintain the appropriate temperature. Because of this, when there is a high humidity level, you will feel warmer than when there is a low humidity level. This is because at lower humidity, sweat can evaporate more easily off of our skin. For instance, according to NOAA if there is a temperature of 86°F and a relative humidity of 50% ,then the real feel will be 88°F. On the other hand, if there is a relative humidity of 95 percent, then that same 85°F will feel like 100°F.

In regards to a dehumidifier, the more relevant term is relative humidity. This is what is monitored by the built-in humidistat in your machine. When the humidistat senses the relative humidity getting too high, it will activate to maintain your desired set point.



USEFUL TERMS FOR DEHUMIDIFIERS

Common terms when talking about dehumidifier

Pints Per Day (PPD):

Pints Per Day is the volume (in pints) of moisture extracted from the air daily by your dehumidifier.


Vapor Barrier:

A vapor barrier is a thin layer of impermeable material, typically polyethylene sheeting, included in building construction to prevent moisture from damaging the foundation of the building. Vapor barriers are used in crawl spaces to prevent moisture in the ground from seeping back into the space once the dehumidifier has removed it.


Gravity Drain:

A dehumidifier with a gravity drain uses gravity to move water through the drain line to an acceptable area for drainage out of the crawl space. In order for a gravity drain to work effectively, the drain tube must be set up properly on a downward slope with no kinks or twists.


Condensate Pump:

A dehumidifier with a built-in condensate pump pumps the condensate (water) from the dehumidifier to an acceptable area for drainage outside of the crawl space. Condensate pumps turn on intermittently depending on the water level in the pump reservoir. As the water rises in the reservoir, it raises a float switch which energizes the pump. The pump will then run until the level of water in the reservoir is substantially lowered. It is important to note that a condensate pump is a mechanical device and will require yearly maintenance to ensure it is functioning properly.


Condensate Pump Lift:

Condensate Pump Lift describes how high the condensate pump is capable of moving water. For instance, the Watchdog 85c has a 15-foot condensate pump lift.


Set Point:

Set point is the desired value in a closed-loop feedback system. When using a dehumidifier, you choose humidity set point, which is the desired humidity level you wish to maintain in the area.


Stack Effect:

Stack Effect describes the the process of humid air entering your crawl space and rising up throughout your home. As the warm air rises and escapes through your roof, it creates a vacuum. The warm air is then replaced with cool air. This is considered the natural airflow pattern of your home. As the air from the crawl space is drawn up into your home it brings moisture and all of it’s harmful side effects with it.


Coils (Evaporator and Condenser):

The condenser coil condenses the refrigerant from a hot gas to a cold liquid by the use of the metering device. This then moves into the evaporator coil where the refrigerant evaporates as it absorbs heat from the indoor air passing over it. The evaporator coil is the one you can see on your dehumidifier that is cool and wet to the touch.


Inlet Filter:

The inlet protects the evaporator coil from dirt and debris as the air is being pulled into the dehumidifier to be conditioned. All Seaira Global dehumidifiers have a filter that protects the coils. All dehumidifiers in the NXT Series come with both a pre-filter and a MERV-10 filter.


Relative Humidity (RH) Sensor:

The RH sensor reads the relative humidity of the space within +/- 5% to determine when your dehumidifier needs to run.


Drain Line:

The drain line is how the water is moved out of the unit and into the drain system. The NXT60, NXT85, and NXT120 all have 12” of drain line for the water to flow from the drain tray to the system you or your installer has put in place to move the water out of your crawl space. All pump models (NXT85c and NXT120c) have 20 feet of drain line to move the water away from the dehumidifier using the condensate pump.


MERV:

MERV stands for Minimum Efficiency Reporting Value. A MERV rating varies from 1-20. The higher the value, the more efficient the filter will be in trapping airborne particles.


HEPA Filter:

HEPA filters are also also known as high-efficiency particulate air filter. To qualify as a HEPA filter, it must remove 99.97% of particles that have a size of 0.3 micrometers. The filters are composed of a mat of randomly arranged fibers that are typically composed of fiberglass. HEPA filters are commonly marketed in HVAC systems for people with allergies.


Carbon Filter:

Carbon filters, also known as activated carbon filters, aid in odor removal. The activated carbon attracts and removes odor molecules by trapping the molecules in the pores of the activated carbon.



HOW DOES A DEHUMIDIFIER WORK?

How do dehumidifiers work

Dehumidifiers are essentially small air conditioners. The difference is that instead of cooling the air, dehumidifiers warm the air up. A built in fan pulls the air through a filter and into the unit. This air then passes over a set of coils that are filled with a refrigerant to keep them cold. Whenever humid air passes over these cold coils, the air is cooled down. This in turn causes the moisture in the air to condense and settle onto the cold coils. The water then drips down the coils into a drain tray. Depending on your exact model, the water is either drained through a gravity drain or into a reservoir to be pumped out.

Once the air has passed over the cooling coils and has had moisture pulled from it, it then goes over a second set of warmer coils where the air is reheated (usually to a few degrees higher than when it started). This dry, warmer air is then pushed back into the room, thus reducing the overall humidity in the air of the room.





CHOOSING THE RIGHT DEHUMIDIFIER

When purchasing a dehumidifier, there are a few key factors you will want to consider:


1. Coverage Area

The first thing to figure out is how much cubic footage you need to cover. The cubic footage is important to know, otherwise, you may end up with an underpowered machine that can’t maintain your desired humidity. If that happens, not only will you not see any improvement in air quality but, you will also waste time and money. To prevent this, simply calculate the cubic footage of your crawl space using this formula: Square Footage x Average Height= Cubic Footage. Keep in mind that this is NOT the square footage of every level in your home, but rather the outline of the structure or “footprint”. If you have a three story home, you do not calculate the square footage of each story, just the footprint.

Formula to calculate cubic footage

For instance, if a crawl space is 2,000 square feet and 4 feet high, the cubic footage would then be 8,000. Once you determine the cubic footage, you can pick which size will work for you.

An example of a formula to calculate cubic footage


2. Efficiency (L/kWh)

Another factor to consider is the efficiency of your dehumidifier. To determine how efficient your dehumidifier will be simply look at what is called L/KwH or Liters per Kilowatt Hour. This refers to the number of liters of water that can be removed from the air, per kilowatt of power, per hour. The higher this number, the more energy efficient the unit is. All of Seaira Global dehumidifiers are Energy Star Rated and provide a well above average L/kWh.


3. Fan Power (CFM)

A powerful fan is a crucial component of any dehumidifier. The fan draws the air from the space into the machine to begin the moisture removal process so you want a fan that’s effective. The amount of air the dehumidifier can process is measured by CFM or cubic feet per minute. Both the WatchDog 900 and 900c models have an impressive CFM of 370. The WatchDog 550 has a CFM of 250, making it quite powerful for it’s size.

Help choosing the right dehumidifier


4. Drainage System

All dehumidifiers need some method for draining water. There are two options for draining- a gravity drain system or a built in pump system. As the name implies, in a gravity drain system, the dehumidifier uses gravity to drain the water. For the system to work, you need a setup that will allow the drain line to run at a decline the entire time, since water cannot flow uphill. As long as you have a suitable area, gravity drains are quite simple to set up. They do require annual maintenance, but it only takes a few minutes. There are 3 models in the NXT series that feature a gravity drain, including the NXT60, NXT85, and NXT120.

If you need your dehumidifier to drain uphill, then a built in pump will be a better option. With the a built in condensate pump, the drain line can be set up to run up to 15 feet uphill. Just like the gravity drain, condensate pumps also require annual cleaning to prevent problems. Both the NXT85c and NXT120x come standard with an internal condensate pump.


5. Digital Controls

One important feature to consider is what type of controls are on the dehumidifier. Some dehumidifiers use a simple dial while others have a digital display. A digital display screen makes a dehumidifier much easier to program. It will give you the capability to set the dehumidifier to your exact desired humidity level. All Seaira models have a digital readout that not only allows you to set your preferred humidity level but also shows you the current relative humidity. Another electronic control to look for is an on/off switch. While all Seaira models include a power button, some lower end models do not come with a simple power switch. This means that you may have to unplug the unit or adjust the humidistat just to get the unit to power off.


6. Digital Humidistat

In addition to digital controls, it’s quite useful to have a digital humidistat. Having a built in humidistat makes it easy to set and maintain your desired humidity level. For instance, you can use the digital screen to set your humidity level to 50% and the dehumidifier will run until the humidity is within 5% of the set point. At that point, the dehumidifier will automatically shut down. The humidistat will continue to monitor the humidity levels and turn the machine on and off, as needed. All Seaira Global dehumidifiers come standard with this feature.


7. Auto Defrost

The Auto defrost feature is highly useful to keep your dehumidifier running in colder temperatures. When temperatures drop below 65°F, the coils can accumulate frost as the condensation on the coils freezes. The built in defrost mechanism monitors the temperatures on the coils and when a predetermined temperature is reached the defrost function will activate. Once the defrost cycle has completed the dehumidifier will continue its normal operation.


9. Noise Level

Noise level might not be your first thought when searching for a dehumidifier, however, it is an important consideration. For example, if your dehumidifier is directly under a living area, you’re going to notice if it’s unusually loud. The last thing you want is a noisy dehumidifier to keep you awake at night. An average dehumidifier will have a decibel level that ranges from 65 to 75 decibels at a distance of 4 feet. A sound level of 65 could be compared to a loud conversation while 75 decibels is similar to the sound of street traffic. The WatchDog 900 and 900c models are rated at 58 decibels, while the WatchDog 550 is rated at an ultra-quiet 52 decibels.


10. Low Operating Temperature

To prevent problems in cold weather, be sure to check what the operating temperature range is when looking at dehumidifiers. Most crawl space dehumidifier will work in temperatures higher than 41°F. This is fine for many situations, however, if use your dehumidifier year round in a unheated basement or crawl space, that might not be enough. To ensure that your dehumidifier continues to work through winter, choose one with a low operating temperature in the thirties. All three models of WatchDog dehumidifiers are able to run in temperatures as low as 33°F.


11. Filter

Filters are an important component in the operation of a dehumidifier as they help preserve your unit. Using a filter helps to prevent dust and dirt build up inside the unit. Keep in mind that filters typically need to be cleaned or replaced at least once a year (depending on the environment). If you’re looking for the more cost effective option, choose a filter that can be washed and replaced. The WatchDog 900 and 900c are equipped with a prefilter that can be easily cleaned and reused. Simply slide the prefilter out of the machine and rinse with water. This will ensure that the prefilter does not get clogged so your dehumidifier can continue to run effectively. There is also the option to upgrade your dehumidifier with a MERV-8, HEPA, or carbon filter. The WatchDog 550 comes standard with a highly efficient MERV-8 filter.


12. Auto Reset

Another convenient feature to have on a dehumidifier is automatic reset. Having a dehumidifier with automatic reset means that in the event of a power loss, the machine will turn back on by itself and continue maintaining the last humidity level that was set. This useful feature means you won’t have to crawl under your house every time you lose power. Instead, simply let the machine turn back on by itself once the power is restored. You don’t even have to worry about settings, the machine will automatically maintain the same settings it had when the power was lost.


13. Duct Adapters

Depending on your desired set up, you may want the option to duct your dehumidifier. Ducting allows you to control where the airflow will be directed or connect the dehumidifier to an HVAC system. It can also be great for placing the dehumidifier in a separate space than what’s being dehumidified. If you think ducting will be a good option for your home, be sure to look for a dehumidifier that comes with the option to be ducted.



Seaira Global NXT Dehumidifiers

NXT Dehumidifiers by Seaira Global

•WatchDog NXT60 (up to 11,000 cubic feet)
At 60 pints per day, the NXT60 is the smallest crawl space dehumidifier offered by Seaira Global. When you need a dehumidifier for a compact area, the NXT60 is the ideal solution. At only 12 inches tall, it’s easily maneuverable in practically any space.

While it may be the smallest dehumidifier in our lineup, the WatchDog NXT60 can easily maintain areas up to 11,000 cubic feet. The unit produces 155CFM airflow at an efficient 2.45 L/kWh.

The WatchDog NXT60 also includes several convenient upgrades that make using the machine quite simple. For instance, when you need to set your desired humidity level, simply use the digital display. Once the set point is in place, the NXT60 requires very little input from you, thanks to features like an automatic humidistat, and auto restart. The NXT60 can also be used with optional accessories such as the wired remote control, or duct kit.

•WatchDog NXT85 (up to 15,000 cubic feet)
The WatchDog NXT85 is the same compact design as the NXT60 but with a larger capacity. With an 85 pint per day capacity, the NXT85 is perfect for bigger areas that need moisture control.

The WatchDog NXT85 can maintain areas up to 15,000 cubic feet. The machine produces 185CFM airflow at 2.71 L/kWh and only 59 dBa. Not to mention that it is the same compact size as the NXT60.

The WatchDog NXT85 includes several features that make using the dehumidifier simple. For instance, when setting the humidity set point, simply use the digital display. After the initial setup, the dehumidifier requires minimal attention with features such as, temperature controlled defrost, auto restart, and an automatic humidistat.

•WatchDog NXT85c (up to 15,000 cubic feet)
The WatchDog NXT85c is the same space-saving size as the NXT85 with same 85 pint per day capacity. The only difference is that the NXT85c features an integrated pump which makes it ideal for spaces where a gravity drain system is not an option.

With a powerful capacity, the NXT85c can maintain areas up to 15,000 cubic feet. The dehumidifier produces 185 CFM at 2.71 L/kWh and 5.3 amps.

The WatchDog NXT85c also includes multiple features to make it easy and efficient to use. First of all, the digital display makes it easy to choose your desired set point. Then, the automatic humidistat, temperature controlled defrost, and auto restart features make the machine quite low maintenance while it is running.

•WatchDog NXT120 (up to 21,000 cubic feet)
The WatchDog NXT120 is one of the largest models in the NXT Series. With an impressive 120 pints per day capacity, the NXT120 is perfect for spaces up to 21,000 cubic feet. Despite its powerful capacity, the 120 maintains 2.8 L/kWh and is only 16 inches tall.

The WatchDog NXT120 dehumidifier features a gravity drain plus an easy to use digital display. Simply use the display to choose your desired set point and the built-in humidistat will maintain the area. The unit also includes auto restart, low-temperature operation, and can be easily ducted on both the inlet and outlet.

•WatchDog NXT120c (up to 21,000 cubic feet)
The WatchDog NXT120c has the same 120 pints per day capacity as the NXT120. What sets the unit apart, is its built-in heavy-duty condensate pump. The pump is capable of 15 feet of lift, giving you more options when setting up your drain line. The pump combined with an intuitive digital display and compact size make installation ultra simple.

With its large capacity, the WatchDog NXT120c can easily maintain spaces up to 21,000 cubic feet. This makes it the perfect unit for a variety of situations including crawl spaces, basements, or HVAC tie in. In addition, the NXT120c can be used with optional accessories such as our wired remote control or wireless environmental monitor.