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35 votes
Accepted

Does A/C encourage mold growth

Yeah, that advice was super wrong. Moisture encourages mold growth. After a water leak you need to go to extremes to dry the air to get wet things to evaporate into the air, which you then ...
Harper - Reinstate Monica's user avatar
29 votes
Accepted

What kind of unvented tumble dryer will reduce indoor humidity?

A more compact alternative worth a mention is a dehumidifer. I dry my washing indoors in UK winters, without a tumble drier. For efficient drying, shutting the damp washing and dehumidifer in a room ...
Chris H's user avatar
  • 6,721
28 votes

Any problem to build a house that covers a same-sized hole in the ground?

Look at it as a start on a foundation hole - but don't get hung up on "making the house the same size/shape as the existing hole" because you can alter the size/shape of the hole when ...
Ecnerwal's user avatar
  • 221k
25 votes

Does a portable fan work for drying the bathroom?

You need a dehumidifier. https://en.wikipedia.org/wiki/Dehumidifier If there is no way to blow the humid air out, run it thru a dehumidifier. You can keep it in the bathroom running on a timer or ...
Willk's user avatar
  • 6,623
22 votes

Does a portable fan work for drying the bathroom?

When the things in a bathroom dry the water is not simply disappearing, rather it is converting from liquid you can see and feel on the surfaces and towels into vapor in the air. In other words, ...
Greg Hill's user avatar
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20 votes
Accepted

Any problem to build a house that covers a same-sized hole in the ground?

You asked: Would there be any problem to build the wood house over the hole, so as to cover it? So I am going to make the following assumptions: You would like to personally build the house There ...
MonkeyZeus's user avatar
  • 16.8k
16 votes

Does A/C encourage mold growth

You are being sold. The evaporator coil in the AC condenses water vapor in the air. It does this by blowing the warm air from your home over the cool evaporator coil. The cool coil pulls the moisture ...
Micah Montoya's user avatar
16 votes

What kind of unvented tumble dryer will reduce indoor humidity?

Heat Pump or Condensing Dryers will not add meaningful moisture to your apartment. Both Heat Pump and Condensing Dryers are closed loop systems, recirculating air inside the unit. Both use a ...
DelphicOracle's user avatar
15 votes

Why doesn't AC equipment come with dehumidifier only option?

The coil on a good dehumidifier is SIGNIFICANTLY colder than the coil on a typical air conditioner. A typical central AC unit is configured so the air coming off the coil is approximately 20 degrees (...
Bitbang3r's user avatar
  • 674
13 votes

Does A/C encourage mold growth

It is possible for A/C to cause mold issues but it depends on a few factors. The problem is this: when choosing a A/C unit for a home, often people (even 'professionals') will assume that bigger is ...
JimmyJames's user avatar
  • 2,090
13 votes

Is it normal for relative humidity to increase when the attic fan turns on?

This is a function of what relative humidity means. The hotter air in the attic can hold more water than the cooler air outside, so for the same absolute amount of water-in-air, the warmer/hotter ...
Ecnerwal's user avatar
  • 221k
9 votes
Accepted

When trying to keep moisture in the house down, at what point would it be best to close the doors and windows, is there a calculation?

The calculations are not very straightforward. You want to look for a Hygrometric chart, that shows the relationship between absolute humidity (amount of moisture in the air), relative humidity, and ...
SteveSh's user avatar
  • 6,912
7 votes
Accepted

Fastest way to dry a vented dirt crawl space (no vapor barrier) in California (Bay Area)

Fastest, without tearing the house apart: 4 fans sized to your 4 vents - two blow in, two blow out. Less fans will probably work fast enough, but 4 would fit "fastest" as requested. If you ...
Ecnerwal's user avatar
  • 221k
5 votes

Is plastic paint a possible solution for a wall with humidity?

Trapping the water in the wall is no solution, it will only wreck the wall more quickly. Any paint you put on there will fall off the wall, as it will be pushed off by the water. I use a lot of ...
Harper - Reinstate Monica's user avatar
5 votes
Accepted

How to construct a time capsule bottle?

It's really hard to assure that they won't be under load anytime in the next 50 years. Obviously, the bottles only need to break once to be ruined. Also, depending on the type of bottle, it might be ...
mrog's user avatar
  • 830
5 votes

Any problem to build a house that covers a same-sized hole in the ground?

You don't say where you live but you will get things living down there. Rats, foxes, badgers for example. They will leave faeces and dead stuff. Make sure you have access steps and built-in lighting.
chasly - supports Monica's user avatar
5 votes

Confused about humidity levels in basement - a math problem

Your basement is not nearly as sealed as you think. Which is actually a good thing. You need to constantly have make up air. That is air to replace the air you breathe. Otherwise, while your H2O is ...
manassehkatz-Moving 2 Codidact's user avatar
4 votes

What is a reasonable air-conditioning schedule to prevent humidity issues?

This question has received a lot of answers and comments, but I suspect not from people familiar with Florida who have encountered the underlying issue. It is a frequent one in Florida because: ...
fixer1234's user avatar
  • 6,118
4 votes
Accepted

draining sauna into crawlspace

Yes, it could lead to wood rot and a severe mold problem. Don't do it.
mrog's user avatar
  • 830
4 votes
Accepted

To reduce damp: heat or dehumidifier?

With "damp", your enemy is humidity, or water which is dissolved in the air. Warm air can disolve a lot more water than cool air. When warm, water-saturated air moves to a cooler place, it cools the ...
Harper - Reinstate Monica's user avatar
4 votes
Accepted

Electric front load dryer making room extremely humid and wet

Most "traditional" electric dryers basically have a heating element, a fan, a motor and a control panel. The motor turns the drum, usually via a belt. The fan blows air past the heating ...
manassehkatz-Moving 2 Codidact's user avatar
4 votes
Accepted

Does the steam function on a dryer produce more humidity than a normal dry cycle?

This is one possibility from my history. Some vent systems don’t handle the extra moisture. yes at the start of a dry cycle the humidity is off the charts, however as the cloths dry and the same ...
Ed Beal's user avatar
  • 103k
4 votes

Fan Coil connected to Heat Pump raises humidity in cooling mode

Temperature and humidity are related. Humidity is more fully "relative humidity" - how much water is in the air now .vs. the maximum amount of water that air at this temperature could hold. ...
Ecnerwal's user avatar
  • 221k
4 votes

Should my humidifier be able to maintain 38% humidity in the winter?

Depends how badly the house leaks air, more than the square footage of the house, really. If the house is leaky, cold dry air comes in and warm moist air goes out and your humidifier has limits on how ...
Ecnerwal's user avatar
  • 221k
4 votes

Should my humidifier be able to maintain 38% humidity in the winter?

Yes one would expect that humidifier to do a pretty good job. "Time for a new pad" was the first thing that came to mind but you did mention having already replaced that. The 700 is a fan-...
Greg Hill's user avatar
  • 31.6k
4 votes

Fastest way to dry a vented dirt crawl space (no vapor barrier) in California (Bay Area)

For standing/very wet surfaces fans will be the best(besides mopping/sponging/pumping). You want a good breeze blowing in from one end and out the other. Amount of fans will depend on area.
crip659's user avatar
  • 26.3k
3 votes

What is a reasonable air-conditioning schedule to prevent humidity issues?

Humidity is relative. Air can hold so much water depending on its temperature. If fully saturated (100%) hot air is dramatically cooled, the water must condense out, which is how clouds and rain ...
Harper - Reinstate Monica's user avatar
3 votes

Bathroom ceiling absorbs moisture and falls apart

I think at this point it's safe to say the drywall above the shower is shot, and now you're going to need to replace it all. While you're in there, install a proper exhaust fan. Yes, I know that's ...
Harper - Reinstate Monica's user avatar

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