Question about DeLonghi DH40P Dehumidifier

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Works well but

...I have a damp basement and need to leave it on.Some people say it is as expensive to run as an air conditioner.Please give a factual answer as to its'energy efficiency. Thanks, Tom

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  • nursetom Oct 07, 2008

    Very informative and knowledgable.I love an answers that you can take to the bank.For bank credit ratings go to www.bankrate.com.Thanks ever so much for your time and effort.nursetom

  • nursetom Oct 07, 2008

    Very informative and knowledgable.I love an answers that you can take to the bank.For bank credit ratings go to www.bankrate.com.Thanks ever so much for your time and effort.nursetom

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Yup, they eat energy.

An electric dehumidifier includes a refrigeration cycle that is very similar to a window AC units and refrigerators. They cool the air in the basement to condense and collect water and remove humidity, heat the air as a required consequence of the refrigeration cycle and dump it back to your basement.

Two sources of humidity in basements include warm outside air that naturally cools due to below grade earth contact and water passing from the ground though the floors and walls and evaporating into the basement. Dehumidifiers do most of the work in the summer when higher temperatures outside enable air to hold more water content.

In the winter, cooler outside air contains less moisture by weight eventhough it may be raining and the relative humidity in basement will be less because the air is warmed relative to the outside. The lower moisture content in the winter also absorbs the water passing through the walls and floor.

From an energy perspective, you may want the humidity set NOT below 50%. This will keep humidity below the level mold desires, but prevents the dehumidifier from doing more work and eating more energy than needed. A cheap battery powered temp/humidy meter left in your basement will help. Sources that include the "mold triangle" (temperature, water & food) often separate fact from expensive hype.

If the dehumidifier doesn't keep up, consider adding a moisture barrier to the basement walls and floors such as Dry-lock and floor paints to ****** moisture entry. Moisture barriers act very similar with water as insulation does with heat. They don't eliminate the need for a dehumidifier, but they reduce the work they do and energy they eat.

Posted on Oct 07, 2008

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2 Answers

How to change coolant in dehumidifier


Improve the FixYa experience for everyone by voting. I want you to let me know if the solution(s) suggested were of any value. Constructive criticism is welcomed.

Hi,

Since you didn't provide a model, the suggestions are not model specific. So bear with me since I have no idea of your tech level and will have to include a lot of detail.

I have no personal interest or association with any product that I may suggest.

How to Recharge a Dehumidifier


Do you need to recharge your dehumidifier? Here's what you need to know.

Dehumidifiers use cooling coils, similar to air conditioners. Those cooling coils use refrigerants, the same as air conditioners do.

If your dehumidifier stops removing moisture from the air but the motor and fan seem to be working fine, your dehumidifier may need to be recharged.

Let's repeat that a different way.

  • Is your dehumidifier's motor running?
  • Is the fan also working?
  • Is your air still too damp?

If so, you may need to recharge your dehumidifier.

That's where this gets interesting.

Legal, illegal and obsolete coolants

Older dehumidifiers use a coolant called R-22. That's being phased out and its use is strictly regulated, around the world.

In the old days, you could by an air conditioner recharging kit. Hook the hoses to the air conditioner or dehumidifier (or refrigerator) and follow the instructions. Easy!

Today, your dehumidifier may still use R-22. If so, due to strict environmental regulations, you'll need to check with an air conditioner repair service.

They may be able to help you, but they may not. It depends on whether they have any R-22, and whether they're authorized to recharge dehumidifiers with it. (Yes, they need a permit for this. Be sure they have one.)

Check your dehumidifier

A panel or sticker on it may tell you which coolant your dehumidifier uses. Or, the manufacturer's date may give you an idea. If the dehumidifier was made before 1995, it's likely to require R-22.

If you own a newer dehumidifier, it may use a more environmentally-friendly coolant. (If you bought your dehumidifier after January 2010, it's almost certain to use something other than R-22.)

New dehumidifiers usually run on R-410A. That's often called Puron.

Puron is one of the best alternatives to R-22. It's inexpensive. So far, it has fewer problems that some other "green" coolants. Puron still causes some ozone problems, because it's methane base. However, it's better than anything else you can buy now.

Puron (or R-410A) runs at a much higher pressure than R-22 did.

So...

You can't just replace your R-22 coolant with R-410A. The valves and gaskets may not hold, and - if your coolant leaks out - you're back to square one.

Generally, it's safer and cheaper to replace your dehumidifier with a new one that's already set up to use R-410A (Puron).

Frigidaire 70-Pint Dehumidifier.
I recommend only one dehumidifier, no matter what your needs. It can handle damp basements. It runs economically. You can set the humidity level you want, and it'll turn itself off when it reaches that level... no wasted electricity!

It's also one of the quietest dehumidifiers and it has top ratings and customer reviews at Amazon. (It's regularly on Amazon's "best sellers" list.)

May 22, 2012 | Whirlpool Dehumidifiers

1 Answer

My husband saids run the dehumifier on low setting to take out dampness in the basement? I said no, run the dehumifier on higher setting like 50 or 60 to take more water out of he basement? What should...


Actually, your husband is correct. The settings reflect the amount of humidity you want to remain in the house. I really don't think you want to leave 50 to 60% humidity in the house.

35% removes the greatest amount of humidity.

Hope this helped answer your question and thanks for choosing FixYa.

Sep 16, 2011 | Haier HDN655E Dehumidifier

1 Answer

My dehumidifier runs but no water will collect in the bucket. I ahve tried increasing the percentage. My basement is plenty damp!! Model504EL


Mine had the same problem: ran, sounded great, no water. Feel the coils. Mine never cooled down - stayed at room temp. No refridgerant left in the coils. It's a gas and can leak out. Expensive to recharge. Get a new one.

Jun 19, 2011 | Goldstar DH504EL Dehumidifier

1 Answer

My D40 runs OK but I am getting absolutely zero moisture removal. I hear it runing but when I smelled dampness in my basement for a few days I looked at it and discovered that is bone dry. Is it shot? ...


No, it's probably not shot. Just may need some adjustments. Below are the common causes of the problem you're having.

1. The humidity extraction level is set to HIGH. Lower it to 32 - 35%

2. Air intake filter is dirty or clogged and needs to be removed and cleaned.

3. Clear air obstruction. Maintain at least 12" of clear air space around the entire unit, while in operation.

4. The ambient air temperature at floor level is between 40 - 60 degrees F. This is particularly true in basement applications. Raise the unit up off the floor, onto a sturdy table, cabinet, etc, that will hold the weight of the unit, plus a full tank of water. The air temp at chest level is warmer than floor level in a basement. Unless, your dehumidifier is what's called a Low Temperature Model (designed for basements) it may be contributing to the problem. Although, based on all the odds, numbers 1 & 2 above, are going to be the culprit.

Hope this helped you to troubleshoot and solve the problem. Please let me know. Thanks.

Jun 12, 2011 | Friedrich D40 Dehumidifier

1 Answer

The dehumidifier is running but no water is being eliminated from my damp basement


Florence, the air intake filter on the humidifier probably needs to be removed and cleaned. When they're dirty, the unit has to strain to take in the damp air. Turn the Master ON/OFF Switch to OFF and unplug the unit, before attempting to remove the filter. Once the filter has been cleaned and dried (if necessary), plug the dehumidifier back in, turn the Master ON/OFF Switch to ON and set the controls as you normally would. After about an hour or more, you should notice water collecting in the bucket.

Hope this helped you solve the problem.

Apr 27, 2011 | Fedders Dehumidifiers

1 Answer

My LG LHD45EL all of a sudden


Short on refrigerant... or a failed compressor. are most likely or a system problem, causing it to trip off.

There may also be a failed electrical component, you need to check for voltage at the compressor.

cheers

Jul 02, 2010 | LG LHD45EL Dehumidifier

1 Answer

Kenmore dehumidifier M/N 580.53650200 only runs for about 1 minute, then stops. Dehumidifying level is set to minimum (40) and it's damp in the basement so I know the air is not too dry. The fan works, the...


Well to knowledge the problem 40 percent is dry. means your basement is great. humidity should be 30/50 percent 50 grows mold. also if it runs for a min the auot shut off is activating. check this first.

Manifestr

Oct 06, 2009 | Kenmore 5365 Dehumidifier

1 Answer

The unit turns on and sounds like it is running,


Your coil temperature has to be below the dewpoint of the air in the basement to remove the moisture. If you can set the temperature lower or the fan speed lower it will help.

Aug 08, 2009 | Whirlpool AD40DSL Dehumidifier

2 Answers

Kenmore 54501 turns on but nothing happens in my damp basement


A dehumidifier heats and cools the air to remove moisture. Most are like a small air cond. The Condenser coil is right in front of the evap.coil. So the compressor may not be coming on. Does it sound the same as before? It may be low on freon. You will have to get in there and listen and feel the lines at or near the compressor, Learn how to get down in there to the compressor. Run it for 10 Mins. unplug it, open it up, and feel the lines. Some lines should be or can be HOT to the touch. Some should be cool. The smaller the line the hotter it should be, and the compressor should be warm (to hot) to the touch. repost for more info.

Jul 08, 2009 | Kenmore 54501 Dehumidifier

1 Answer

Question on temperature range


Most dehumidifiers run between 42 degrees and up. If you need one for lower temperatures you can buy special ones. If you have cold temperatures in your location the air is usually dryer in the winter so the dehumidifier is not really neaded during that season. The average humidity setting you would want to run it at is 60 Percent. It will keep your basement from becomming damp and also keep it from running nonstop. Good luck and if you found this solution helpful please rate it when you get a chance. Thanks - Tech101

Jun 04, 2008 | Kenmore 54701 Dehumidifier

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