Home Humidity Management

High indoor humidity can be hard to control. Often people use their air conditioners to remove moisture from their home since this happens as a by-product of cooling. However dehumidification is not the primary purpose of and air conditioner. An air conditioner runs off of a thermostat which only senses temperature not humidity levels.

When it is hot and humid outside and you run your AC all day, an air conditioner works fine to remove humidity. But if it is not hot enough to run your AC, the humidity levels outside may still be high enough to be uncomfortable and consequently the humidity level in your home is high too. It might be rainy and cool outside, wet enough to be humid but not hot enough to run your air conditioner.

Humidity Facts

It only takes between four and six pints of water to raise the humidity level of a 1,000 square feet from 15 percent to 60 percent. The number of people in your home will affect the humidity level since one person breathing can produce up to 1/4 cup of water in and hour. Some mold can grow when the relative humidity level is above 50 percent. Most molds like relative humidity above 60-70 percent.

You should have a hygrometer in you home to measure the temperature and relative humidity. Ideal relative humidity is 40-50 percent.

Mold Facts

  • Mold needs 3 things to grow: moisture, warmth and food.
  • Mold decomposes dead organic materials like wood and materials made from wood, like paper.
  • Molds can digest some synthetic things such as pastes, paints, or adhesives.
  • Molds secrete digestive fluids that decompose the substrate and make nutrients available.
  • Mold cannot digest non organic materials like concrete, plastic, glass or metal, but it can digest a possible layer of dirt or dust that coats the surface of these.
  • Typically relative humidity about 60 percent is needed to provide the moisture a mold needs to grow.
  • Humidity makes a surface damp enough to permit growth.

If you have questions about the humidity in your home, call A-Plus Mechanical. We’re happy to answer your HVAC questions.

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