Latest Discussions : Basement & Foundation


06:07AM | 11/03/05
Member Since: 05/20/01
5 lifetime posts
I am renovating and re-finishing my basement, which I had to demo because of mold caused by humidity and a high water table underneath our slab. After we removed the mold we brought in three residential dehumidifers which have greatly reduced the humidity in the basement, but our electricity bills have gone sky high. A waterproofer I spoke to (and trust) recommended installing the Humidex system. He said that while the cost to install is expensive (over $1000), my electric bills will go back down because it is inexpensive to run. I did some research and the Humidex just seems to be a fan that blows air out of the basement and forces air circulation in the house. Does anyone have any experience with the Humidex? Does it really work? Will it do the job of several dehumidifiers in a relatively large (1000 sq. ft.) basement?


08:34PM | 11/03/05
Member Since: 04/25/05
1915 lifetime posts
First of all you did not indicate how you have solved the high water problem or where the humidity is coming from.

There can be multiple reasons for humidity in a basement and need different solutions.

Also you did not indicate the climate or construction detials.

Tht said as far as I can tell the humidex is basically a very expensive bathroom fan.

What is does is exhaust the relatively high humidity air for the basment. And cause it to be replaced with relatively dryer air from up stairs. That is true.

However, what they don't tell you is that in turn cause the UNCONDITIONED AIR to be drawn in from outside.

If it is hot/humid outside then that means that the AC needs to run that much more to cool and dehumidify the air.

If it cold the the furnace needs to reheat the air. That is the part that they don't discuss.

Now if the RH in the basement is high because it is relatively cool then heating the area and/or circulating warmer air from other parts of the house can help.

if the cause is excess moisture coming through the walls then aht needs to be address.

Start here.

Read the article on Mold, Relative Humidity, ventalation and Basement Insulation Systems.


07:46AM | 11/04/05
Member Since: 05/20/01
5 lifetime posts
Thanks for taking an interest in my situation. We didn't really solve the high water problem as much as we are dealing with it. We have a sump pump that keeps the water below the floor, but there is always water in the pit about 6 inches below floor level. We installed a 1/2 horsepower Zoeller pump, a 1/3 hp backup pump, and a double-marine battery backup system.

Until recently we did not realize that the clothes dryer fan was shooting air into the basement instead of through the vent to the outside. We've corrected that problem. Otherwise, I'm not sure why it's humid in our basement keeping the dehumidifiers on in the summer and spring.


09:01AM | 11/04/05
Member Since: 05/20/01
5 lifetime posts
I should also mention that we are putting 2 coats of DRY-LOK on our cinder block basement walls and also working on better grading our property, keeping our gutters clean, and putting in some downspout extensions so that water from the gutters is pushed away from the house.


08:23AM | 03/24/15

We used to be a dealer for Humidex. According to Humidex, the unit is supposed to replace a dehumidifier. In reality, it does not because it can't.

The theory is interesting, but the reality is these machines simply do not work 90% of the time. They are just a very expensive fresh air exchanger doing the job a $75 bathroom vent fan would do if one were to install it in the basement.

We ended up removing most of the units we installed and eating the cost. Having to adjust the fan according to outside RH did not sit well with our customers. And, pulling in the wrong air from outside also displeased our otherwise happy clients.

I would NOT recommend these units to anyone. Make the investment in an energy efficient dehumidifier. In most cases people who had the Humidex had to run their dehumidifier as well.

Needless to say, we do not ever talk about Humidex to our clients...they simply do not work.


10:58PM | 05/16/15
You are 100% wrong. Period.
I have a customer that has run hers for 20 years nonstop 24 hours a day. She lives right on the river and her basement is bone dry.
Believe me people, the Humidex is the best thing ever invented for giving you a dry basement by removing humid air from the basement.


11:00PM | 05/16/15
You are 100% wrong. Period.
I have a customer that has run hers for 20 years nonstop 24 hours a day. She lives right on the river and her basement is bone dry.
Believe me people, the Humidex is the best thing ever invented for giving you a dry basement by removing humid air from the basement.


08:05PM | 06/16/15
We have had a Humidex running for 17 years in our crawlspace on a low setting. Which doesn't do much. On higher settings it sucks the heat right out of the house. Its a somewhat efficient way to heat the flower beds through the winter. If you like heating the outdoors...


07:31PM | 04/18/16
I have installed 100's of Humidex units and every house has a different level of success. in my own building it did more than i expected it to lowering my heating and cooling cost because it was removing the heaviest air to cool and heat and The musty odor was gone. the most moister filled air continually gets removed. In my Mothers house it does a great job also. Before her Humidex was installed using a dehumidifier she always had condensation in one area of her basement and had to empty the dehumidifier. it cost about the same as an air condition to run.. since installing her Humidex there was no dehumidifier needed and no condensation on the basement floor ever. Running the Humidex uses about 34 watts, less than a 60 watt light bulb. It has worked well for many people i have installed for. Some noticing a difference before i leave the house. there are some houses it will not work in. It is a good product for the houses it works in. One of my customers had me uninstall it because they were not happy with it. 2 weeks later they had me reinstall it because the husbands allergies had never been better in the house. they were running a dehumidifier and Humidex because they had an extreme situation in their basement.


10:01AM | 08/29/16
I took a 4" X 6' piece of PVC and a 4" 90 degree PVC elbow, Notched the end, installed a 3 speed fan inside the PVC approximately 8" from the notched end. I secured the PVC against the basement wall notched end on the floor facing away from the wall, installed the elbow on the other end with a short length of Dryer vent hose, vented it out through a newly cut vent hole in my wall, and installed a vent cap outside. Plugged the fan in, turned it on medium and was done! 4 years later and no musty smell, dampness and best of all, no mold or mildew! Total cost to build, $67.74. Approximately $16.75 monthly in added electricity cost. I do however have to turn the fan on high in the hotter months! No worries.....


09:25AM | 10/16/18
I have a 1500 sq. foot basement and I put in the largest humidex that you could get at the time. Without any dehumidification running and in the middle of the wettest part of summer, my RH is typically around 75-80%. With the humidex running full out at best it lowers it to 70%. I don't have water table issues just normal humidity you get in a below grade space. My conclusion is that while the humidex does vent out stale air it doesn't lower the humidity enough for it to get my basement to an RH that is comfortable and healthy. So, I'm investing in a larger dehumidifier that can handle the entire space and I may stop using the humidex.


12:31PM | 06/27/19
Member Since: 06/27/19
1 lifetime posts
Yeap: you can buy here:


12:01AM | 08/12/19
BV17696 must be getting a kick back. Had one installed in my home several years ago. The humidity went up. Honestly a waste of money


04:16PM | 01/09/20
Another point to make...if your humidex isn't working as some of you's an installation issue. You have to not only know how to install but WHERE in your home to install. A lot of do-it-yourselfers deem themselves experts at anything to do with their own home...and often times others homes as well...claiming it doesn't make it reality nor does it make it a fact because "you said so". If Humidex can stop a homes walls from literally sweating...and dry them so paint not only sticks but is dry with full coverage. It protects him and his family from the terrible allergies he was suffering because of the unhealthy mold his home as well as others whose homes have been plagued with black mold, in homes in Nova Scotia Canada, practically ocean front to a fishing town...then trust me when I tell you...your installation was improperly done. It's a do over.


01:15PM | 02/21/22
is there a certian model thats better in Nova Scotia?


01:16PM | 02/21/22
is there a certian model thats better in Nova Scotia?


04:28PM | 05/22/22
I have a humidex and it is not working for me either. I still have to use a dehumidifier. I had light radon issues as well and that is why I went with that unit. I'm sure it helps for the radon, but not the humidity. Also, when humidity gets high (spring, summer, rain...) it says that I have insane amounts of co2(over 2 billion ppm) and I have a detector right next to it and it shows 0. Wish I never bought it. Waste of time and money.

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