What temperature should you keep your house to avoid mold?

Author: Myriam Becker  |  Last update: Thursday, February 12, 2026

Keeping the air conditioner set at 78 degrees or lower prevents mold buildup in the summer. Even when leaving for a few days or vacation, don't set it above 80. A higher setting won't provide enough dehumidification from the cooling process to prevent spores from growing.

What is the best room temperature to prevent mold?

Temperature Mold spores typically need a temperature of 50--60°F (10--16°C) to survive. To prevent mold growth, you can try to keep your home's temperature above 60--65°F. Humidity Mold grows best in moist, humid environments. You can try to keep your home's humidity below 60%, ideally between 30--50%.

Does a warm house stop mold?

Heat actually does help a lot, cold walls will cause moisture in the air to condense on the walls and the mould needs that moisture to grow and spread. The best thing for combatting mould long term is keeping the house warm and humidity down, a dehumidifier will work wonders in the long term.

At what temperature does mold start to grow in a house?

Mold needs water to grow; without water mold cannot grow. Mold also needs food, oxygen and a temperature between 40 degrees and 100 degrees F. Since mold decom- poses dead organic (once living) material it can grow on wood, the paper facing on gypsum board (drywall) and other materials made from wood.

Can keeping your house too cold cause mold?

The water in the air then condenses on colder surfaces: visible, for example, on the typical fogged windows in the car and in the home. But condensation also forms on exterior walls that are too cool and can increase the risk of moisture penetration and thus mold growth there.

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Does leaving AC on prevent mold?

Your AC can control the temperature and humidity in your home, which can prevent mold growth. During the hot, humid summers, set your air conditioner between 68 and 72 degrees Fahrenheit. The relative humidity in your house should not exceed 50%.

What temperature kills house mold?

Boiling water can kill mold outright (more on this in the next section), but you can't exactly boil your walls or carpet. However, you may be able to kill mold by heating it enough to dry it out. Most molds can be killed at temperatures of 140 to 160 degrees Fahrenheit, but the effect isn't immediate.

What are the 10 warning signs of mold toxicity?

Although symptoms can vary, the most common symptoms seen in people exposed to mold indoors include:
  • Nasal and sinus congestion.
  • Eye irritation, such as itchy, red, watery eyes.
  • Wheezing and difficulty breathing.
  • Cough.
  • Throat irritation.
  • Skin irritation, such as a rash.
  • Headache.

Does leaving a light on prevent mold?

Molds require oxygen, but not light, for growth. Mold growth can continue indefinitely without light.

What does mold hate?

Mold hates light. Other than moisture there's nothing mold loves more than dark places. An easy prevention against mold growth is opening your blinds and shades. If it's warm enough out, open the windows.

What is the lowest safe temperature for a house?

While away on long periods of time, such as vacation, we don't recommend setting the temperature any lower than 50 degrees (F). One of the last things you want is to come back home and find busted pipes and water damage throughout your home. This can be the outcome if the pipes freeze and burst.

Does an air purifier help with mold?

Mold is an obvious health risk in any home, but investing in an air purifier can help limit your exposure. The best among them will ideally offer HEPA-level filtration, with this level of filtration being able to trap up to 99.97% of airborne particles down to 0.3 microns in diameter.

What temperature to set a thermostat to prevent mold?

If your home is susceptible to mold growth, set the thermostat at 72 degrees. While the best AC temperature to prevent mold growth is between 68 and 72 degrees, keeping it at the upper end of the range will give you mold-inhibiting results without the high price tag.

Do fans help prevent mold?

Ventilation fans are the best way to prevent mold build up inside a home. Think about it: what happens when a home has a flood? Typically, a water damage expert will be called in and the first thing they do is bring in ventilation fans to dry out the moisture and wetness inside the home.

Does opening windows help with mold?

Mould thrives in damp areas such as windows, where there is dust, dirt or organic material, that's why the number one way to reduce mould is to open your windows regularly. By opening the windows at least once a day, this allows the mould spores to escape and lets patches of moisture dry out.

How to tell if mold is making you sick?

Signs and symptoms of allergic rhinitis caused by a mold allergy can include:
  • Sneezing.
  • Runny or stuffy nose.
  • Cough and postnasal drip.
  • Itchy eyes, nose and throat.
  • Watery eyes.
  • Dry, scaly skin.

How to find hidden mold in your house?

Most often, a mold problem will be readily identified by a musty smell that becomes obvious in damp environments. Mold also likes to play hide and seek, so if you suspect there is a problem, then check under carpets, behind drywall, inside ductwork, in between bathroom tiles and in other moisture-prone areas.

How do you detox from mold exposure?

Here's a look at some of the best foods to incorporate into your diet if you're aiming to detox from mold exposure: 1. Antioxidant-Rich Foods: Load up on citrus fruits, berries, nuts, and green leafy vegetables. These provide vitamins C and E, which combat oxidative stress from toxins.

Does a cold house make mold worse?

Cold rooms especially are often rarely visited by homeowners, but contain a damp, dark and cold environment that allow mold to flourish. Many people only consider mold growth following a water leak or flooding, but mold can grow anywhere, anytime in areas of your home that are damp and cold.

At what indoor temperature does mold grow?

Many fungi grow well at temperatures between 60 and 80 degrees Fahrenheit, which are also ideal temperatures for human comfort. In addition, as mentioned above, temperature gradients often produce the moisture needed for mold growth.

How warm should your house be to stop mould?

Ideally your home should be heated between 18 to 21 degrees Celsius, but older people, babies and people who are less mobile may need it to be warmer. It is important that the tenant helps to reduce the condensation problems by taking steps to limit the amount of moisture produced in the property.

What is an unsafe house temperature?

It's advisable to keep your home below 80 degrees throughout the summer. A house that's too warm can be dangerous to people, pets, and the soft surfaces in your home. Set the winter temperature to 68 degrees when you're awake and 62 degrees when you're sleeping.

What is the healthiest temperature to sleep in?

The best room temperature for sleep is approximately 65 degrees Fahrenheit (18.3 degrees Celsius). This may vary by a few degrees from person to person, but most doctors recommend keeping the thermostat set between 65 to 68 degrees Fahrenheit (15.6 to 20 degrees Celsius) for the most comfortable sleep.

Is 65 too cold for a house?

The World Health Organization recommends keeping indoor temperatures between 64 and 75 degrees Fahrenheit for healthy people. The minimum temperature should be kept above 68 degrees Fahrenheit to protect the very young, the elderly, or people with health problems. Watch out for signs of hypothermia.

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