A base­ment dehu­mid­i­fi­er is need­ed to reduce the humid­i­ty lev­el to the opti­mum lev­el. The entire area becomes dri­er, the struc­tures are not exposed to the destruc­tive action of excess mois­ture. A prop­er­ly select­ed unit works effi­cient­ly and does not require third-par­ty costs. More on this below in the arti­cle.

Purpose and principle of operation

A dehu­mid­i­fi­er is nec­es­sary in those base­ments where it is nec­es­sary to main­tain the lev­el of mois­ture in the air at a spe­cif­ic lev­el. In gen­er­al, the prin­ci­ple of oper­a­tion is based on such a phys­i­cal phe­nom­e­non as the con­den­sa­tion of water vapor when the tem­per­a­ture drops below the “dew point”.

The fol­low­ing stages of the dry­er oper­a­tion can be dis­tin­guished:

  1. From the humid atmos­phere, air enters the dry­er, where it comes into con­tact with the cold mat­ter of the heat exchang­er.
  2. The removal of heat leads to cool­ing and, con­se­quent­ly, to the for­ma­tion of con­den­sate from the water vapor that was pre­vi­ous­ly con­tained in the air.
  3. Water in its nor­mal state flows into a spe­cial con­tain­er, from where it enters the pan or drain pipe.
  4. Mean­while, cold and dried air, pass­ing through the con­denser, increas­es the tem­per­a­ture and enters the base­ment.

Basement dehumidifier

Work fea­tures:

  • when the unit is oper­at­ing, the humid­i­ty changes, and the tem­per­a­ture remains the same;
  • the device helps to pre­vent the for­ma­tion of con­den­sate, mold, fun­gus, cor­ro­sion of met­al struc­tures;
  • it cleans the air to a great extent.

Types of dehumidifiers

There are three main types of equip­ment on the mar­ket:

  1. Assim­i­la­tion. The oper­a­tion of the device is based on forced ven­ti­la­tion, that is, the wet mass is removed from the base­ment by suc­tion, con­vert­ing it into dehu­mid­i­fied air at the out­let. Such a dehu­mid­i­fi­er is applic­a­ble to large-scale facil­i­ties. If we talk about prof­itabil­i­ty, then it is worth men­tion­ing the decrease in the lev­el of effi­cien­cy due to the con­stant con­sump­tion of elec­tric­i­ty.

Note that the assim­i­la­tion unit is not able to dry the air in rain and snow, as well as in areas where a humid cli­mate pre­vails.

  1. Con­dens­ing. The method of action is sim­i­lar to a refrig­er­a­tion unit: the wet stream enters the tubes with inert gas cool­ing, the con­den­sate leaves in the form of water, fill­ing the tray, and the air returns to the room.

The dis­ad­van­tage of a dehu­mid­i­fi­er is the need to peri­od­i­cal­ly drain the liq­uid, oth­er­wise the device turns off.

  1. Func­tion­ing on the prin­ci­ple of adsorp­tion. It is used to dry the base­ment at tem­per­a­tures of +10 and below. Air mass­es are inject­ed into the sys­tem, pass through adsor­bents, where mois­ture is neu­tral­ized. Then the absorbent mate­r­i­al must be dried or changed accord­ing to the prin­ci­ple of car­tridges.

A sig­nif­i­cant dis­ad­van­tage of this type of aggre­gates is the fre­quen­cy of chang­ing the adsor­bent.

The type of dehu­mid­i­fi­er device has a direct impact on the fea­tures of its oper­a­tion.

Main technical characteristics

Before buy­ing, you should take a clos­er look at the tech­ni­cal char­ac­ter­is­tics:

mois­ture removal

First, refine the per­for­mance of the mod­el. An indis­pens­able para­me­ter is mois­ture removal. It shows the amount of mois­ture that the device is able to “squeeze” out of the air. It is very impor­tant to choose the right mod­el for a spe­cif­ic design.

Dehumidifier and dehumidifier

Con­sult a com­pe­tent man­ag­er who can sug­gest a dehu­mid­i­fi­er based on the esti­mat­ed amount of mois­ture released in your base­ment.

Please note that the instruc­tions indi­cate the para­me­ters that are valid at a humid­i­ty of 80% and a tem­per­a­ture of +30. In fact, most of the objects where air dry­ing is nec­es­sary are warmed up, on aver­age, to +22 degrees, and the required humid­i­ty lev­el reach­es 60%. Such para­me­ters reduce the per­for­mance of the mod­el by 20–25%.

Tem­per­a­ture regime

The sec­ond para­me­ter to which you need to pay atten­tion. At the same time, con­sid­er whether there is heat­ing in the base­ment in win­ter. As a rule, con­dens­ing type dehu­mid­i­fiers func­tion effec­tive­ly at tem­per­a­tures from +15. High rates will lead to an increase in the abil­i­ty of mois­ture removal.

If the ther­mome­ter drops below +10, then the dehu­mid­i­fi­er goes into defrost mode and can­not dry with the same inten­si­ty.

When the mark on the ther­mome­ter is below +15, then experts call for the com­mis­sion­ing of an adsorp­tion dry­er.

Air exchange

An impor­tant para­me­ter that is often over­looked. It shows how much air mass the device can process in an hour. It is opti­mal if the val­ue of this para­me­ter is 2–3 times the vol­ume of your room. Oth­er­wise, the humid­i­ty will not reach the required val­ue.

Poten­tial ener­gy costs

This indi­ca­tor may vary depend­ing on the brand of the man­u­fac­tur­er. Clar­i­fy­ing ques­tions should be asked to the con­sul­tant in the process of select­ing a dehu­mid­i­fi­er.

Con­den­sate tank capac­i­ty

When you do not have the oppor­tu­ni­ty to vis­it the base­ment dur­ing the day and drain the liq­uid, take care of the capa­cious vol­ume of the tank. Many direct drainage to the sew­er, and the prob­lem dis­ap­pears by itself.

7 popular models

The list is com­piled accord­ing to the inten­si­ty of sales and con­sumer reviews:

  • Hisense DH-25K4HDL. Equip­ment from a Chi­nese man­u­fac­tur­er. Able to drain 25 liters in 24 hours. Equipped with a humid­i­ty lev­el con­trol sys­tem and a capa­cious con­den­sate tank of 6.5 liters. It has a built-in air fil­ter that does not require replace­ment. The dehu­mid­i­fi­er is equipped with an auto­mat­ic mode, two dry­ing speeds, a timer. Quite light and com­pact. Suit­able for rooms up to 50 sq. m.

Hisense DH-25K4HDL

  • Stadler Form Albert Lit­tle A‑050E. Capa­ble of serv­ing a base­ment up to 30 sq. m. Can work in night mode. Con­sid­ered to be quite effi­cient. Auto­mat­i­cal­ly turns off when the tank is full.

Stadler Form Albert Little A-050E

  • Neo­cli­ma ND-40AH. Pret­ty com­pact mod­el. Works in rooms with a tem­per­a­ture of 5 to 35 degrees. It is char­ac­ter­ized by a reduced noise lev­el, equipped with a dis­play. It has an auto-defrost func­tion.

Neoclima ND-40AH

  • Tim­berk DH TIM 20 E7. Man­age­ment and con­trollers are dis­played on a mod­ern LED dis­play. Reach­ing a cer­tain per­cent­age of mois­ture con­tent, it turns off. Con­den­sate can be col­lect­ed in a con­tain­er or drained through a tube into a drain.

Timberk DH TIM 20 E7

  • BONECO 2055D. Equipped with patent­ed sil­ver hon­ey­comb fil­ters that puri­fy the air from bac­te­ria. The fil­ter is changed once a year. You can add fra­grance. Suit­able for areas up to 50 sq. m.


  • Smart­Mi Air 2 ORIGINAL. With­in 10–15 min­utes it cleans the air in base­ments up to 24 sq. m. Equipped with remov­able fil­ters with antibac­te­r­i­al prop­er­ties, which has a pos­i­tive effect on pre­vent­ing the devel­op­ment of fun­gus.

SmartMi Air 2 ORIGINAL

  • MASTER DH 710. Refers to the con­dens­ing type. It is com­plet­ed with the coal fil­ter for elim­i­na­tion of unpleas­ant smells. Man­age­ment is car­ried out on the touch pan­el. Suit­able for rooms with an area of ​​​​35–40 square meters. m. It has sev­er­al modes of oper­a­tion.


When choos­ing a mod­el, many ini­tial fac­tors should be tak­en into account, since only if the ini­tial data match­es the mod­els avail­able for sale, it is pos­si­ble to pur­chase a unit that will dry the humid base­ment air for many years.

Vik­tor Datsky

Con­sul­tant in the field of house­hold appli­ances. I help guests of the SovetExpert.ru project to choose the right prod­uct and save mon­ey when buy­ing. I have an unbi­ased opin­ion. Ready for dia­logue.

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