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Is it worth using a dehumidifier to help cool house? #5190715 08/18/19 08:47 PM
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gregk24 Offline OP
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Our A/C seems to struggle to cool off our house, especially in the summer. I am not sure what size the unit is, but I do know the condenser was replaced after 2013. I am looking into purchasing a dehumidifier to remove excess moisture from the house. I am borrowing my mother in law's unit for a week or so to see if it helps. Do any of you use one of these to help remove excess moisture and make your house more comfortable? Also, I will be checking my energy use to see if it will reduce our bill.


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Re: Is it worth using a dehumidifier to help cool house? [Re: gregk24] #5190719 08/18/19 08:50 PM
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eljefino Offline
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Get your house AC tuned up better. Dehumidifiers leave you with warm air and a bucket of water.

Re: Is it worth using a dehumidifier to help cool house? [Re: eljefino] #5190731 08/18/19 09:03 PM
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Rmay635703 Offline
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Originally Posted by eljefino
Get your house AC tuned up better. Dehumidifiers leave you with warm air and a bucket of water.


Some of the older less efficient AC units are just as capable of dehumidifying as an actual dehumidifier.

A dehumidifier makes about 300-500% more heat than it uses in Watts so expect things to get toasty,
Dehumidifiers are great in the winter and perfect if you have a floor drain and lots of vacation to stay out of the house.

Re: Is it worth using a dehumidifier to help cool house? [Re: gregk24] #5190741 08/18/19 09:18 PM
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dishdude Offline
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How's the duct work and insulation?

In a humid environment like FL, a dehumidifier isn't a bad idea. Do you have a hygrometer to see if it's needed?


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Re: Is it worth using a dehumidifier to help cool house? [Re: dishdude] #5190758 08/18/19 09:35 PM
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gregk24 Offline OP
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Originally Posted by dishdude
How's the duct work and insulation?

In a humid environment like FL, a dehumidifier isn't a bad idea. Do you have a hygrometer to see if it's needed?


We live in a 1959 home, ductwork is original as far as I know and insulation is only blown in in the attic.


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Re: Is it worth using a dehumidifier to help cool house? [Re: gregk24] #5190760 08/18/19 09:38 PM
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dishdude Offline
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Originally Posted by gregk24
Originally Posted by dishdude
How's the duct work and insulation?

In a humid environment like FL, a dehumidifier isn't a bad idea. Do you have a hygrometer to see if it's needed?


We live in a 1959 home, ductwork is original as far as I know and insulation is only blown in in the attic.


For the duct work you can see, is it sealed with mastic? is the insulation deep enough? How's ventilation in the attic? A fan up there might be a consideration.


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Re: Is it worth using a dehumidifier to help cool house? [Re: gregk24] #5190785 08/18/19 10:08 PM
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Alfred_B Offline
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I would use a portable AC for additional cooling. Some have a dry function as well.

Re: Is it worth using a dehumidifier to help cool house? [Re: gregk24] #5190812 08/18/19 10:42 PM
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Nick1994 Offline
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Try to gather some numbers.

Outside temp, inside temp set to, actual temp inside house at hottest part of day, humidity *(in and out), etc. Then put your thermometer for an hour or so in each room, any rooms warmer than others?


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Re: Is it worth using a dehumidifier to help cool house? [Re: Alfred_B] #5190833 08/18/19 11:18 PM
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Originally Posted by Alfred_B
I would use a portable AC for additional cooling. Some have a dry function as well.

Portables in my opinion won't help. All that hot air that the portables blow outside is replaced with outside air being drawn back into the house or you would wind up with a vacuum. They in my situation raise the humidity in the house, and I verify that with a hygrometer. If the condenser is too big, it may short cycle, and not run long enough to remove the humidity. If too small, it can't remove enough humidity no matter how long it cycles. I'm no HVAC pro, but maybe someone with more know-how can chime in.


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Re: Is it worth using a dehumidifier to help cool house? [Re: gregk24] #5190846 08/18/19 11:41 PM
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Re: Is it worth using a dehumidifier to help cool house? [Re: gregk24] #5190849 08/18/19 11:44 PM
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mcrn Offline
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I use damp rid around my older house in Florida during summer.

Last edited by mcrn; 08/18/19 11:45 PM.

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Re: Is it worth using a dehumidifier to help cool house? [Re: gregk24] #5190976 08/19/19 06:25 AM
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We have a vacation condo up in the mountains and externally visible AC units are not allowed, so on the occasional warm day we just run a dehumidifier in the place and it helps a lot.
The place was just a little toasty and close last time we went up there and it was quite comfortable after the dehumidifier had run for about an hour.


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Re: Is it worth using a dehumidifier to help cool house? [Re: gregk24] #5190980 08/19/19 06:28 AM
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A dehumidifier will never cool a house. It will always add heat. But it will make it more comfortable by reducing humidity.

Re: Is it worth using a dehumidifier to help cool house? [Re: gregk24] #5191003 08/19/19 06:56 AM
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I would see if your gas or electric provider offers a free energy audit Many offer a free one.
Your home was built in 1959 when builders didn't care much about insulating as utilities were cheap.
There might be a tax credit if you have any work done.

You can rent a machine to blow it in from Home Depot... Make sure it's done correctly as you don't wanna cutoff air flow from any soffit vents.


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Re: Is it worth using a dehumidifier to help cool house? [Re: gregk24] #5191007 08/19/19 06:58 AM
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AZjeff Offline
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I think Greg's question is will lower humidity air cool better? Another question is will the old AC overcome the added heat from the dehumidifier when it's struggling already?


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