Dehumidifier calculation or Dehumidifier Sizing for home.

This article explain how to do dehumidifier calculation with help of method proposed by AHAM without calculating actual moisture load.

Right Dehumidifier calculation become important to decide right size dehumidifier. Once you noticed symptoms of high humidity at your home and you decided to purchase a dehumidifier then first question comes into mind is what dehumidifier capacity do I need? There are many methods of moisture load calculation available. For home generally dehumidifier design calculation method proposed by Home Association of Home Appliance Manufacturers (AHAM) is most widely used one. It offers dehumidifier calculation sheet from which one can select right size of dehumidifier. Many dehumidifier supplier companies provides online dehumidifier calculator which directly proposes their right size model for you. In this article we will try to understand dehumidifier sizing for home based on AHAM method.

Dehumidifier calculation by AHAM method.

Dehumidifier calculation by AHAM proposed method is easy and simple. Even though it is not very accurate one but for home application we can use this method. Whole method is based one two factors; size of room which need to be dehumidified and humidity condition in that room. Size of room is defined in square feed area. while based one humidity level it areas are divided into four type of area as follow:

  • Moderately damped room with musty odor and uncomfortable environment.
  • Very damp areas in which we can observe spot on floor, spot on wall and bad smell.
  •  Very Wet area where humidity is so high that due to condensation sweating on wall or seepage on wall is observed.
  • Extremely Wet area where humidity too high such that water accumulates on floor.

For easy understanding for all consumer above humidity level classification has been associated with symptoms like musty odor, spot of wall and floor, sweating wall and wet floor so that consumer can easily understand.

Let’s size Dehumidifier for your home.

To select right capacity of dehumidifier just you need to follow this chart. And simply follow following steps:

Dehumidifier design calculation with dehumidifier calculator.

Step 1: Major size of room which you want to dehumidified. For this you can use approximate measurement also. Only thing you need to take into consideration that room which you are considering has separate air conditioner. If air conditioner is common for room which need to dehumidified and other room then you need to consider area of both room.

Step 2: Depending on symptoms of high humidity (bad smell, spot on wall, wet floor etc.) you need to decide if your room is  moderately damped or very damped or very wet or extremely wet.

Based on above two data from chart you can decide dehumidifier capacity.


Let’s consider that you have room of area 1000 sq. feet which you want to dehumidified. Also Air conditioner is common between this room and other room of having area of around 500 sq feet. Also you are observing spot on wall and floor due to high humidity.  Hence your total area to be dehumidified will be 1000 + 500 = 1500 sq. feet and your room condition is “Very Damp”. So based on chart you need dehumidifier having capacity of 12.5 liter/day.

Dehumidifier supplier in UAE.

Once you decide capacity of dehumidifier, second important selection is dehumidifier supplier selection. In UAE CtrlTech is oldest dehumidifier company offering wide range of dehumidifier. Their product portfolio includes home dehumidifier, industrial dehumidifier, dehumidifier for swimming pool, warehouse dehumidifier and dehumidifier for cold room. For home application CtrlTech offers CD-25L dehumidifier having capacity of 25 liter/day. According to AHAM chart it can dehumidify extremely wet are up to 2500 sq feet, moderately damp area  up to 3500 sq feet. Other than capacity of dehumidifier you need to pay attention of some of the important features that home dehumidifier should have. Home dehumidifier should be quite in operation, it should have full automatic operation, it should be safe for children, it should be portable, should have large tank etc.

To Know more about dehumidifier calculation, please contact us.