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
  • 6,651
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
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
  • 214k
6 votes

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

Logic would say it is normal. When the fans turn on they are drawing in the outside air. Outside air is higher in humidity than attic air. Low humidity air is being replaced with higher humidity air. ...
RMDman's user avatar
  • 28.9k
3 votes

water condensation inside electrical conduit running on attic

Weep Holes NEMA (as in "NEMA 5-15 receptacles", that NEMA) has some guidelines on this online. Basically they recognize that electricians drill drainage openings (weep holes) in conduit ...
manassehkatz-Moving 2 Codidact's user avatar
3 votes
Accepted

What would cause drywall moisture to raise during the day and drop at night?

Wet drywall would be a concern, but your wall is not wet. You are getting an instrument reading that does not comport with your own observation that the wall is actually dry. Gypsum, the main ...
MTA's user avatar
  • 11.2k
3 votes

Sizing charts for air conditioner or heat pump for humidity rather than cooling? 1-stage vs. 2-stage? 3-stage?

ACCA Manuals J and S are your friend The official, Code-sanctioned way to size HVAC equipment comes from ACCA Manuals J on load calculation and S on equipment selection. Manual J in particular is ...
ThreePhaseEel's user avatar
2 votes

What dehumidifier should I get for a small bathroom that doesn’t have a great way to evacuate humidity after showers?

If you are in a humid climate in a home with no air conditioning, keep the bathroom door and window closed at all times, keep the dehumidifier running, and if you see it producing its capacity of ...
jay613's user avatar
  • 37.4k
2 votes
Accepted

Greenish/Gray Mold on all beds and matresses

Mold is primarily an inhalation hazard. How bad the hazard is depends on a lot of factors. Usually it is immuno-compromised, mold sensitive, pregnant, old or really young that have the largest ...
Fresh Codemonger's user avatar
2 votes

water condensation inside electrical conduit running on attic

Water will condense inside conduit in cold areas that have openings to heated living spaces that will have higher moisture content. In such cases, duct seal putty is in common use to seal the openings ...
kreemoweet's user avatar
  • 3,539
2 votes
Accepted

How to prevent this white material in the receptacle?

You'll need to investigate further. It'll be hard to give confident answers from one blurry photo. Some possibilities: Fungus Insect nesting Debris from insect or animal gnawing The best advice I ...
isherwood's user avatar
  • 137k
2 votes

Can I cover part of my mini-split cooling coil to remove more moisture?

Humidity is actually relative humidity -- it's a ratio of the mass of water vapor in the air compared to the amount that the air is physically capable of holding. Warmer air can hold more grains/...
Greg Hill's user avatar
  • 30.6k
1 vote

Aprilaire 56 humidistat not turning on for low humidity

Test your outdoor temperature sensor with an OHM meter it should have some resistance. The amount of resistance is posted in the instruction manual for the controller. The exact resistance changes ...
Some Dude's user avatar
1 vote
Accepted

How to bring electric cooker in chimney's coverage when there's gas hob occupying the whole place

Turn on the vent fan. There's almost always a damper on the exhaust for efficiency purposes, so if the fan is off, the vent hood isn't extracting anything. You fix this by turning on the vent fan, and ...
KMJ's user avatar
  • 11.4k
1 vote

Sizing charts for air conditioner or heat pump for humidity rather than cooling? 1-stage vs. 2-stage? 3-stage?

The latent heat of vaporization (or enthaply) is the BTUs (or more generally heat) required to evaporate water to the air. Flip the sign (remove heat rather than add heat) and it's the "BTUs (or ...
Ecnerwal's user avatar
  • 214k
1 vote

Do I need an attic exhaust fan?

I would only install an attic exhaust fan if you are positive that your attic is properly sealed and insulated from your home. If not properly insulated (insulation taped and joints caulked), a new ...
Thomas Wood's user avatar

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