Comparison: Dehumidifier vs Heater

Dehumidifier vs heater

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In short, heater is an appliance that can blow out warm air. It has fast and good results, so it is common heating equipment in winter.

Many people will have this question: Since the heater blows hot air, does it also have a certain dehumidification function and can be used as a dehumidifier? Today we will discuss this issue.

The Effect of Humidity On People

Higher humidity makes people feel indoors warmer than they actually are. When the relative dry humidity is above 90%, 26℃ will make people feel 31℃, and the humidity will greatly affect health and comfort.

When the humidity is too high, the concentration of thyroxine and adrenaline in the body is relatively reduced, the cells will become “lazy”, and people will feel listless and sluggish. Working and living in places with high humidity (such as mountains, islands, basements) for a long time are also prone to rheumatism, rheumatoid arthritis and other wet paralysis.

Difference Between Heater and Dehumidifier

They have different purposes: heater used to increase the temperature, but dehumidifier used to adjust the humidity, so their principles and components are different.



Heater is usually heated by PTC, fan blows out heat to achieve the heating effect. Its components included: fans, PTC heaters, motors, etc; While dehumidifier uses the principle of air cooling to condense the water vapor into liquid and discharge it, and then exhaust to achieve a dehumidification effect. Its components included: compressors, evaporators, condensers, fans, etc., which is circulating system equipment.

Which Is The Best Choice For Dehumidification

Dehumidifier for anti-allergy


Dehumidifier is the best choice for your home dehumidification. It sucks in moist air through the fan, condenses the air moisture into water droplets through the heat exchange system, and then discharges the treated dry air out to reduce the relative humidity through air circulation.

Heater is actually equivalent to separating the heat function of the air conditioner. Because the hot air rises upward, when the air conditioner is heating, due to its high installation position, the hot air blown out is mainly concentrated in the upper part of the room, causing waste. The heater is different, its hot air can be sensed by the human body for the first time, so it is quite practical.

But heater can’t dehumidify. Air has a feature called “dew point temperature”. It means the temperature point at which condensation occurs in the air under the current air state and the temperature at which condensation begins to appear. Refrigeration can dehumidify because the air in the environment (in contact with the temperature of the refrigerant) is lower than its dew point temperature, so the water in the air condenses out and achieves dehumidification. Heater can only heat the air but can’t condense the moisture in the air, so heater can’t dehumidify.

Air Conditioner Dehumidification is Not Good

Most air conditioners have a dehumidification function. In addition, air conditioners are already essential electric appliances in the home, so air conditioners are the most convenient dehumidification equipment. Whether cooling or heating, air conditioners can adjust the relative humidity in the room. For some air conditioners with independent dehumidification functions, the dehumidification effect will be better than ordinary air conditioners.

However, do you ensure needn’t a dehumidifier if you own an air conditioner?

Compared with dehumidifier, the dehumidification capacity of air conditioners is very small, not only the dehumidification speed is slow, but also the dehumidification effect is far away from a dehumidifier.

What’s more, the air conditioner is relatively fixed, which means one air conditioner can’t dehumidify all rooms in the house. Therefore, its function is very limited, only suitable for indoor relative humidity is not large, and dehumidification work in a small range.

AC working no good

Air conditioner

If the room temperature is not so high but the humidity is high, it’s not a good choice to dehumidify this room by air conditioner, because people will feel colder and colder, extremely uncomfortable.

Even if the air conditioner has an independent function of dehumidification, the compressor will still be running at high speed for a long time. This virtually increases the load on the air-conditioning compressor. The power consumption of air conditioners is relatively large, and long-term work not only wastes power but also easily causes compressor failures. Long-term use in this way will shorten compressor’s lifespan.

Therefore,  better to use a dehumidifier for room dehumidification.


We know what is the best choice for room dehumidification, is dehumidifier. Heater is better for heating the room, matching dehumidifier and heater can bring you a comfortable winter, isn’t it?

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About Author

Vic Cheung
Vic Cheung

Hi, I'm Vic! Start working in HVACR field since 2008, our main products included: air conditioning, cold room refrigeration system, water chiller, ice machine, commercial dehydrator, dehumidifier, heat pump, electric motor, and all accessories. Since joined China Speedway Group in 2012, I worked in here more than 10 years, as the general manager of export department, we have established 50+ agent in different countries and areas.
As our experience and strong technical support, we can solve your issue once you have, and our chief engineer has worked in HVACR field since 1997. I am so proud of our knowlege is more and more popular not only for engineer, and for HVACR business new comer, DIY lovers. Hope you are enjoying our articles, if any question or comments just welcome to send me marketing at

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China Speedway Group is a professional HVACR products’ manufacturer and wholesaler, we customize different HVACR products and spare parts, especially refrigeration products and parts. Such as air conditioning, refrigeration equipment, cold room solution, ice machine, dehumidifier, electric motor, heat exchanger,copper coil, etc.

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