Humidity, the amount of moisture in the air around you, plays an extremely important role in controlling the number of
airborne allergens in your home. The two most common indoor allergens, dust mites and
mold, thrive in warm, humid conditions. Allergens, such as mold and fungus are present
though dormant in nearly all materials, but in the presence of a food source and moisture, they can rapidly proliferate.
By keeping your relative humidity in the air below 50 percent, you can control the dust mite and
mold spore populations in your home. The easiest and
simplest way to do this and to increase the overall comfort level in your home is to control
humidity levels with a dehumidifier. Dehumidifiers remove water
vapor from the air and lower the relative humidity in your home.
How Dehumidifiers Work
regulate humidity by removing moisture from the air and creating living conditions that are inhospitable to dust mites, mold and other allergenic organisms.
Room dehumidifiers, like
Danby or Soleus, work much like air conditioners--warmer, moist air enters the dehumidifier and then crosses refrigerant cooled coils, causing the moisture in the air to
condense on coils within the machine. The moisture then collects in a drip pan or bucket for disposal while the air is slightly
reheated before being discharged. The reheat process is done by capturing and using heat generated from the energy spent to
cool the air. By being slightly warmed, the air exiting the dehumidifier is dry and warm - which means it will attract
moisture like a magnet and maximize the dehumidifier's efficiency. Of our residential units, our line of
Aprilaire dehumidifiers are some of the largest units we offer. Aprilaire is the only
dehumidifier manufacturer that offers both excellent whole home as well as top notch basement/crawlspace dehumidifiers, including the very popular Aprilaire 1850F.
As the newest addition to our offering, Santa Fe crawlspace dehumidifiers
are a popular line for basements, attics, and crawlspaces. While some models can be worked to tie into HVAC systems, this isn't as easy as with
AprilAire whole home models. With steel construction, unmatched efficiency and a range of models to meet your size and drying needs,
Santa Fe dehumidifiers are a preferred choice for many homeowners with moisture controls problems.
Commercial and industrial units, like our Ebac dehumidifiers and Dri-Eaz dehumidifiers, work exactly
the same way, but they have features like internal pumps and powerful fans that make them ideal for
cleaning, water damage, and restoration projects. Another key feature to the Ebac
line is that most are constructed of steel. This makes them heavier, but also lends itself to increased durability and longevity.
Dri-Eaz dehumidifiers are constructed of a rugged plastic that is
extremely resistant to dings, dents and cracking.
If you are allergic to dust mites or mold--or if you smell a musty, mildew-like odor in your home, or see
condensation on windows, walls, or floors, then
you should seriously consider using a dehumidifier to improve your indoor air quality. Some allergens, such as mold,
can turn into a serious and difficult problem to solve if allowed to grow unchecked in your home. In addition to
health concerns, excess moisture speeds the natural process of oxidation. From metals to wood, every material found on
this planet is subject to the process of decay and deterioration through oxidation. In bedrooms and spaces where there are carpet,
indoor humidity levels under 55% or so can help to reduce dust mites. They, like mold, need a certain level of moisture in the
air to survive. Another common household problem that relies upon humidity to live is household pests, like roaches, spiders, and
other insects. By keeping relative humidity levels low you can make your home inhospitable to these common insects. While researching a dehumidifier,
there are some important factors to keep in mind before you make your purchase.
Moisture Removal Rate
|How much water does the dehumidifier remove from the
air in a given amount of time? Some Ebac industrial
dehumidifiers can remove a whopping 50 gallons
of water per day! One of our Dri-Eaz commercial models can remove
140 pints of water a day at 80° and 60% relative humidity, while the top end Santa Fe dehumidifier, the Max Dry, can
extract up to 155 pints per day from your crawlspace or basement. Because your particular situation may not call for a unit this powerful, a standard
room dehumidifier is the most common type of dehumidifier sold today. Depending on the
Soleus dehumidifiers, and the Santa Fe Rx are
all room-sized dehumidifiers that can remove between 30 and 74 pints of moisture per day.
the right size dehumidifier with the space you need to dry is key to getting the most from your
dehumidifier while keeping your home in the ideal, 40-50% relative humidity range. Many dehumidifier manufacturers rate their machines
by square footage, but this can sometimes be misleading considering the height of a space can vary from a crawlspace to basement or room in your
home to commercial warehouse space. Other manufacturers use cubic footage, but this is not universal.
Coverage of particularly large areas is also dependent on airflow within a given space and the current humidity levels. In large spaces, if
airflow is good, this can make the job of a dehumidifier easier. However, even if airflow is aided by things like ceiling fans or climate control/HVAC
systems, high levels of humidity may still warrant the use of more than one dehumidifier.
In most homes, 50-70 pint dehumidifiers typically have a powerful enough fan to adequately dry any single room. For open basements, Santa Fe and
AprilAire models are excellent options in the vast majority of homes. For crawlspaces, even the smallest Santa Fe
(the Compact2) and all of the
Ebac and Dri-Eaz models will dry sufficiently. You can do some tailoring when selecting your model by comparing CFM (cubic feet per minute) or air
moved by each dehumidifier to give you a better idea between models when one lists square footage while another may list cubic footage.
For areas of the country where humidity is a more persistent or severe problem, it may be worth considering the use of a whole house dehumdifier. These units tie directly into the
existing HVAC and can help to reduce moisture levels throughout the entire home. Not sure if a whole model is right for you? Check out our differences between
single room and whole home dehumidifiers page.
If your dehumidifier is for a basement, garage, crawlspace, or any
other area that might get cold during the winter, you will want to make sure that it can operate
at lower temperatures. Ebac dehumidifiers are
industrial strength and have different temperature ranges
depending on the model, but they all work well in low
temperatures--most, like the
Ebac CD35 Dehumidifier, work all the way down to 33°F!
The Ebac Desiccant Dehumidifiers work at even lower temperatures.
The Dri-Eaz line of low grade refrigerant (LGR) dehumidifiers
are engineered to work in temperatures from 33°F to 100°F.
Danby models work in temperatures down to 44°F, while
Santa Fe dehumidifiers have a temperature range down to 49°F.
Soleus units will typically function
in temperatures as low as 41°F. At this point, it is worth noting that below 50° or so, the efficacy of a refrigerant based dehumidifier
drops significantly. So while all models will actually run, starting from just above the freezing point, their efficiency is dramatically reduced until the
temperature gets up to around 50. For most of these basement/home/crawlspace models, low end temperature is not a major concern as these spaces typically
stay above 50° F.
On the high end of this scale are the
Dri-Eaz 2800i and 3500i dehumidifiers, which
can operate in temperatures ranging from
33°F to temperatures as high as 125°F.
Choose a dehumidifier keeping in mind not only the temperature
range, but also the overall climate of the region in which you live. For instance, in the Northeast a dehumidifier would
be particularly useful since humidity remains high from May to October, while the temperature may
remain mild. An air conditioner,
which also removes some moisture in the air, would not run enough (due to the lower temperatures) to adequately control the
moisture levels in your home. In this case, a dehumidifier would be an excellent fit.
Similar to a thermostat, a humidistat indicates the relative humidity and allows you to adjust it to the desired level. Most dehumidifiers
generally come with built-in, adjustable humidistat controls. Sometimes it may also include a digital readout, and in others it may simply
be a dial to adjust from wetter to drier. In the smaller, portable dehumidifiers and in many water damage restoration models, there is only
on/off functionality. If you need to monitor the relative
humidity in your home, we offer an affordable, high-quality humidity gauge, the Acu-Rite Digital
To Pump or Not To Pump
if not all, good dehumidifiers provide a small length of hose. This drain line allows condensate to flow directly out of the dehumidifier into a
nearby sink or floor drain. Using only gravity, this process of "porting" your dehumidifier, eliminates the need to empty a water reservoir. In some instances,
a gravity drain simply isn't plausible, and in crawlspaces, the supplied hose is rarely long enough to reach outside of that space. This is where a condensate pumps
comes in handy. This separate pump works much like a sump pump and collects condensate in a small reservoir. Once it reaches a certain point, it expels the water,
often pushing it up to 25 feet, horizontally. Larger dehumidifiers and restoration dehumidifiers often have pumps integrated into them and provide 20-25 feet of
hose, but even some smaller, room humidifiers have an integrated condensate pump, like the Sunpentown
dehumidifiers. Whether you need a pump largely depends on your specific circumstances, but almost anyone, the use of a pump that comes either as a
basement package (the case with Santa Fe dehumidifiers) or integrated (as with Sunpentown and many Ebac and Dri-Eaz models) can provide convenience.
Like all appliances, different dehumidifiers use different amounts of energy for operation. Typical dehumidifiers can use anywhere from 50 to
800 watts. (For comparison sake, a typical lamp uses about 60 watts, while a typical computer uses about 365 watts). Danby, Soleus, and Santa Fe dehumidifiers are
all Energy Star compliant for lower energy costs. Santa Fe dehumidifiers, in particular, are the most energy efficient dehumidifiers available, with
some exceeding Energy Star minimum requirements by as much as 50%. This can make a large impact on your yearly power bill. If you want a good comparison, particularly between larger
dehumidifiers, look for the Energy Factor. The higher this number the better as it tells how many pints or liters of water are extracted per kilowatt hour of electricity
All the room dehumidifiers we offer are
relatively quiet, with the Albert, by Stadler Form being the absolute quietest refrigerant-style
dehumidifier we offer. For those who have owned
older models of dehumidifiers, you will find
that these new models are much quieter than
their predecessors. Larger dehumidifiers (whole house or for
commercial use) like Ebac are louder
than room size units, but they are
generally installed near or around your HVAC unit, on job sites, or outdoors. Whole home dehumidifiers are generally
quiet, and if the noise
of your HVAC running is not an issue, Dri-Eaz, Aprilaire, or an Ebac dehumidifier will likely not cause you any problems.
Ease of Use
Most modern dehumidifiers were designed to be user friendly.
For example, both Danby dehumidifiers and the high end Stadler Form Albert room dehumidifier
feature electronic controls, fully adjustable humidity
settings, auto defrost, auto-restart
feature, removable and easy-to-clean air
filters, and direct drain options for
continuous operation. Look for these options
that will make your life easier:
- Water level control to prevent overflow (typically a float)
- Full Tank Light that lets you know when it is time to empty the tank
- Drainage/Porting option so that you do
not have to worry about repeatedly emptying the tank
- The easiest option would be an integrated condensate pump
- Anti-Frost Sensor (or Auto De-icer/auto defrost that keeps the dehumidifier from freezing up)
- Mobility--most of our room dehumidifiers
come with wheels or casters for easy
transport and nearly all come with built in handles. Even some of the basement/crawlspace models, like the
Santa Fe Classic and most of the restoration
models come with casters.
A manufacturer's reputation and the experiences of past customers deserve consideration in your decision. Certain manufacturers and products are highly respected
in the industry for a reason--and the same goes for products which have garnered less respect. So whether it is a review or award issued by a nationally
recognized magazine or simply an excellent review from someone just like you, it pays to do your research before buying.
A one-year warranty is the industry standard. A two-year warranty is even better! Take into
account what the warranty covers--motor, fan, electrical components, the refrigeration system? Also, find out if certain customer actions will void the warranty. Warranties
are your insurance policy against defect and malfunction, so it is prudent to take these into account when choosing a dehumidifier for your home.