Is mold exposure worse in winter?

Author: Percy King DVM  |  Last update: Sunday, October 12, 2025

Mold growth will continue if there is moisture, which could be why some people's symptoms worsen during the winter and spring. For mold remediation to be successful, it is critical to find the source of water or dampness and accurately correct the leak.

Does mold get worse in winter?

Many fungi thrive at between 60 and 80 degrees Fahrenheit. This, coincidentally, is precisely the temperature that most people heat their houses to during the cold weather. In fact, these temperatures, combined with the increased moisture of the winter season, can create an ideal habitat for mold.

Is mold high in the winter?

Mold thrives in dead vegetation and is not killed by winter frosts. In fact, many molds can become dormant during the winter only to grow on plants killed by the cold when springtime arrives – making mold a year-round allergy trigger.

What time of year is mold worse?

Mold thrives in warm, humid conditions, making weather a significant factor. During mold season, which spans from early spring to mid-fall, the combination of higher temperatures and increased moisture in the air creates an ideal environment for mold spores to germinate and spread.

What are signs of mold sickness?

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.

Health Effects of Mold Exposure

What happens if you breathe in mold for a long time?

Chronic Fatigue: Mold forces your body to work harder, leading to persistent fatigue, especially in those with pre-existing conditions. Lung Issues: Prolonged exposure can cause lasting damage to lung function.

Can you recover from mold sickness?

Yes, you can recover from mold exposure. Once removed from the moldy environment and after receiving appropriate treatment, symptoms usually improve. However, prompt medical intervention is vital, as prolonged exposure can lead to chronic respiratory issues or more severe health complications.

Does mold in a house ever go away?

The most important thing you can do is get rid of mold and dampness as quickly and safely as possible. Mold problems will not go away unless moisture problems are fixed. It is not important to have someone measure how much mold there is or to find out what kind of mold it is.

Does cold air create mold?

In cold environments, mold can grow due to condensation in attics, insulation, and around HVAC systems. To prevent mold growth, home and business owners should take measures year-round, like controlling humidity levels in the building, addressing any moisture, and cleaning any mold immediately.

What temperature kills mold?

Most yeasts and molds are heat-sensitive and destroyed by heat treatments at temperatures of 140-160°F (60-71°C).

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.

Why are my allergies so bad in winter?

Our windows are closed, and many homes are built tighter, with better insulation and fewer drafts. This is good for energy savings but can lead to allergy symptoms. In effect, winter seals us into our homes with our allergens, and increased exposure may make symptoms flare.

How to stop mold in bedroom in winter?

a dehumidifier, which extracts moisture from the air, can be bought or hired. wipe down surfaces affected by condensation regularly to prevent mould growth. mould can be removed by washing the surface with a disinfectant or a fungicidal wash. This must be used in accordance with the manufacturers' instructions.

Does mold get worse at night?

Mold spores count is highest at night, especially when it's foggy, damp or rainy. Upsetting these mold spores send them into the air, triggering an allergic reaction in people who have an allergy to mold.

What temperature does mold stop?

If you seriously want to avoid mold in your home then avoid rooms cooling completely. Experts recommend that the ideal temperature for living rooms is 20°C, 23°C for the bathroom and children's rooms, and 16C for the bedroom and kitchen. It is recommended that you never let the temperature of your home fall below 14°C.

Does heating a room stop mold?

While heat can inhibit mould growth, it may not necessarily kill mould on its own. Mould spores are resilient and can withstand high temperatures up to 60°C. Simply increasing the temperature in your home may not be enough to eliminate mould. However, heat can be part of a comprehensive mould remediation strategy.

Does turning on AC 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%.

Can a cold room cause mold?

The short answer: yes! Mold can easily grow in cold rooms, mainly due to the build up of condensation that creates a damp environment. During the summer months or when air enters the cold room from you heated basement, warm air condenses on cold walls.

What kills 100% of mold?

Hydrogen peroxide, commonly used to disinfect wounds, is active against a wide variety of micro-organisms including mold. It acts by releasing oxygen at a rapid rate, which kills mold by oxidizing the surface and breaking down proteins and DNA.

Can you sleep in a house with mold?

So, if you are sleeping in a damp or mouldy room, you're spending about a third of your time inhaling dangerous mycotoxins spores. Frequently inhaling these spores leads to a plethora of health problems for both healthy and vulnerable people.

How to tell if mold is active?

Identification of Mold

Active mold in the early stages of a bloom has hair-like filaments in webs, which develop a more bushy appearance as the bloom matures. This is more easily seen under magnification. Active mold is soft and may smear when touched with a fine brush. It may also be slimy and damp.

How do I detox my body from mold?

To detox your body, focus on:
  1. Hydration: Drink plenty of water to flush out toxins.
  2. Nutrient-Rich Foods: Eat antioxidant-packed fruits and vegetables.
  3. Exercise: Boosts circulation and lymphatic drainage.
  4. Supplements: Use glutathione or activated charcoal under supervision.

Can mold behind walls make you sick?

It irritates the nose and throat, which can lead to both sneezing and coughing as your body tries to get rid of the irritant. Inhaling mold spores can also trigger coughing in people with allergies or an asthma attack, for those with asthma.

Can your lungs recover from mold exposure?

Exposure to mould can have an impact on your lungs, particularly for people with a lung condition like Chronic Obstructive Pulmonary Disease (COPD), bronchiectasis or asthma. And whether you have a pre-existing condition or not, prolonged exposure to mould can cause irreversible damage.

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