Sum­mer is on the nose, and you have decid­ed to buy a mobile air con­di­tion­er. Hav­ing stud­ied all the offers on the mar­ket, you under­stand that this type of device is a bit noisy and has an air duct to remove warm air to the out­side.

And then sud­den­ly every­where on the Inter­net adver­tis­ing: “New! mobile air con­di­tion­er with­out duct for the home — a mini-air con­di­tion­er fre­on-free air cool­er! Qui­et in oper­a­tion and cheap! Buy quick­ly, oth­er­wise you will not have time!

The prin­ci­ple of oper­a­tion of a mobile air con­di­tion­er with­out an air duct is the evap­o­ra­tion of water on a porous fil­ter when an air flow pass­es through it. But after all, this is an ordi­nary humid­i­fi­er of the tra­di­tion­al type or an air cool­er with a fan, which is “sucked in” for 14–18 thou­sand rubles!

When water evap­o­rates, heat is indeed tak­en away, how­ev­er, water is not a high­ly volatile liq­uid, so the rate of heat removal is rel­a­tive­ly low. At the same time, dur­ing the oper­a­tion of such a device, the humid­i­ty in the room increas­es great­ly, which caus­es a sharp decrease in the rate of evap­o­ra­tion. To increase it, it is nec­es­sary to ven­ti­late the room, but this will lead to the flow of warm air from the street, which we are fight­ing against. As a result, we get increased humid­i­ty, the ces­sa­tion of water evap­o­ra­tion and heat extrac­tion. At the same time, the elec­tron­ic com­po­nents and the engine of the device emit it. Thus, this is an “air con­di­tion­er” that re-humid­i­fies the air and heats the room, rather than cools it. Local­ly, at the place of air out­let, the tem­per­a­ture will be some­what reduced, but in the apart­ment or office as a whole, the tem­per­a­ture will rise!

Mobile air conditioner with air duct
Impor­tant! Only mobile air con­di­tion­er, hav­ing a duct for the removal of warm air,
can per­form its main func­tion — cool­ing

If you tell the sell­ers about this, they will offer you cold con­densers — small con­tain­ers of water that must be frozen in the refrig­er­a­tor and put in the water tank of a mobile air con­di­tion­er with­out an air duct. This, of course, is rea­son­able, but … only if you freeze them at a neigh­bor’s: after all, the refrig­er­a­tor will release addi­tion­al heat dur­ing freez­ing. And even in this case, cold con­densers will not real­ly help.

This is akin to a ques­tion from a school physics course: “Will the tem­per­a­ture in the room drop if you open the refrig­er­a­tor door?” No, not that it will not go down, it will go up. The refrig­er­a­tor will release more heat from the back than it absorbs through the open door, because due to the effi­cien­cy of less than 100%, part of the elec­tri­cal ener­gy will be con­vert­ed into heat (the cur­rent over­comes the resis­tance of the con­duc­tors, part of the mechan­i­cal ener­gy in the com­pres­sor is spent on over­com­ing fric­tion).


A mobile air con­di­tion­er with­out an air duct is an “air con­di­tion­er” that re-humid­i­fies the air and heats the room, rather than cools it. This is con­firmed by numer­ous cus­tomer reviews on spe­cial­ized forums. Also, such humid­i­fiers can be found under the names “cli­ma­tiz­er”, “evap­o­ra­tor-cool­er”, “bio-con­di­tion­er”, “4 in 1 mini-air con­di­tion­er with­out fre­on”, “air con­di­tion­er on water”, “air cool­er on water” and oth­ers, no less stu­pid , terms.

Only a floor air con­di­tion­er with an air duct for remov­ing warm air from the room can per­form its main func­tion — cool­ing. “A mobile air con­di­tion­er with­out an air duct” sounds ridicu­lous and ridicu­lous.

You can choose and buy a mobile air con­di­tion­er that real­ly cools the air indoors at home, office, room, shop­ping pavil­ion or ware­house in our Mis­ter Cli­mate online store. You can get more detailed infor­ma­tion on avail­abil­i­ty, deliv­ery and pay­ment from our con­sul­tants by phone +7 (812) 648–22-49.

For those too lazy to read

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