What Happens to Mold in Winter? Mold Removal and Cold Weather

Mold Removal Myrtle Beach

Cold Weather Won’t Permanently Fix Your Mold Problem

The Myrtle Beach area is a hot and humid area for much of the year. Because mold thrives in climates like ours, it’s easy to think that your in the clear and ahead of the problem when winter comes. However, cold weather--even freezing temperatures--will not kill mold spores. Instead, mold spores will lie “dormant” until moisture and warmth make growth possible again.

MasterTech Environmental of Myrtle Beach removes mold and prevents regrowth. Our mold remediation process guarantees lasting results so mold doesn’t grow back once the heat returns.

Winter Mold Growth Can Happen

South Carolina winters can be unpredictable. A string of below freezing temperatures can give way to days in the 70s. The return of warmer weather can trigger mold growth. Remember: mold needs moisture, warmth, and food (organic matter) to grow. If a particularly warm and sunny day comes, mold around windows, on walls, or near exterior walls may begin growing again.


Sometimes mold can grow without warm weather outside. If your HVAC system keeps temperatures warm but is ineffective at reducing indoor humidity, mold may grow. Excess moisture that is not removed from the air likes to condense on cold walls. This condensation can become a prime breeding ground for indoor mold.

Steps to Prevent Cold Weather Mold Growth

  • Recognizing the underlying cause of winter mold growth can help you fix the problem.
  • If dry air leads to using an indoor humidifier during the winter, this could be a source leading to mold growth. Try to set indoor humidity levels below 40%. This should create an indoor climate where air is not so dry that it is uncomfortable, but not too humid where excessive moisture could compound an existing mold problem.
  • Additionally, clean and vacuum thoroughly. Don’t let moisture build up in bathrooms or around kitchen sinks. Use your exhaust fan when showering, and make sure that fans work effectively.
  • It’s an obvious one, but find and fix leaks. Most indoor mold problems can be traced to a leak. Seal windows, doors, and check gutters and downspouts to make sure water is draining away from your home.
  • Find sources of excess humidity. A poorly vented dryer can make for a humid area that mold spores love to live in.
  • In conclusion, take a careful inspection of your home, always looking for leaks and condensation. If you can eliminate some of the conditions that mold needs, you can start to see results.

How to Handle Mold That Keeps Coming Back

If your mold problem returns, it’s time to call MasterTech. We’ve written before about DIY mold removal and those cases that require professional tools. With porous surfaces like wood or drywall, mold spores may be living within the material itself, making a DIY cleanup near impossible.


To learn more about how MasterTech Environmental of Myrtle Beach can remove your mold, contact us for an estimate.

Mold inspection in Myrtle Beach
By Jonathan Smith September 26, 2025
Schedule a professional mold inspection in Myrtle Beach and take back control of your air because protecting your family’s health and your home starts with finding what you can’t see.
By Jonathan Smith September 20, 2025
You smell something musty when the AC kicks on — is it coming from your attic? It’s unsettling when a wave of mustiness greets you every time your air-conditioning starts. The odor wafts from vents, yet looking around your living room reveals no visible problem. Eventually, you climb into the attic and find black and white patches on the roof decking and rafters. You may feel embarrassed for missing it, angry about the potential cost, and worried about what your family has been breathing. That mix of emotions is normal. Hidden attic mold often goes unnoticed because attics are rarely visited and because spores can travel quietly through ductwork. When mold establishes itself overhead, it isn’t just an eyesore; it becomes an air-quality issue for your entire home. Molds release spores whenever they are disturbed. An HVAC system that passes through or near a moldy attic can carry those spores into bedrooms and living spaces, exacerbating allergies and asthma. Any mold growth indoors indicates a moisture problem and needs to be addressed promptly. Attic mold remediation isn’t about cosmetic cleaning—it’s about eliminating a contamination source, fixing the underlying moisture and ventilation issues, and protecting your air ducts from becoming a delivery system for spores. How Attic Mold Enters Your Living Space Mold contamination in the attic rarely stays contained. The attic may be hidden above your head, but the pathways that connect it to your living space are surprisingly efficient. Airflow, ductwork, and even subtle pressure changes in your home can act as invisible highways, carrying spores downward where your family lives and breathes. Understanding these entry points shows why attic mold is more than an isolated issue; it’s a whole-house problem. Here are the most common ways attic mold infiltrates the rest of your home. · Supply and return ducts run through or near a moldy attic. Warm air traveling through cool, humid attic spaces can condense on ducts, creating wet spots where mold colonizes. Once mold grows on or near the ductwork, spores are easily pulled into the system and distributed to the rest of the house. · Negative pressure draws attic air downward. When bathroom fans or dryers operate, they can depressurize living areas, pulling attic air (and mold spores) into the house through small openings around light fixtures and access hatches. · Running a contaminated HVAC system spreads spores. If heating or cooling equipment is contaminated with mold, operating it can push spores throughout the building. Moisture and Ventilation Issues Are the Real Culprits It’s easy to blame mold itself for the problem, but mold is more of a symptom than a cause. The real enemy is moisture, and in the confined environment of an attic, even small amounts of dampness can create a breeding ground. Mold takes advantage of humidity, condensation, and leaks, thriving wherever water lingers longer than it should. Without addressing these underlying triggers, any cleanup is only temporary. The most common culprits behind attic mold include the following: · High humidity or inadequate ventilation. Warm, humid air trapped in an attic condenses on cooler surfaces. Blocked soffit vents, improperly vented bathroom fans, or missing ridge vents allow moisture to accumulate and keep attic lumber damp. · Roof or flashing leaks. Small leaks around chimneys, vents, or roofing materials provide direct moisture and can drip onto insulation and rafters unnoticed. · Poorly insulated ceilings or ducts. Temperature differences between conditioned living spaces and an unconditioned attic cause condensation on ductwork or the underside of roof sheathing, encouraging mold growth. · Long run times for undersized HVAC systems. Oversized fans running continuously re-evaporate water sitting on cooling coils and push moisture back into the attic and ducts. What Professional Attic Mold Remediation Does Differently DIY attempts often focus on surface-level fixes, such as bleach sprays or paint, but these solutions only mask the problem temporarily. Professional attic mold remediation is different because it treats the issue as a whole-house health hazard, not a cosmetic blemish. The process is carefully designed to protect your family during cleanup, remove contaminated materials thoroughly, and prevent mold from coming back. A trained remediation team follows a multi-step approach that includes: · Containment and protection of living areas. Professionals install physical barriers and negative-pressure units so that air flows into, not out of, the work area. This prevents spores from traveling to clean parts of the home. Simply painting over or covering mold is not an acceptable solution. · Removal and cleaning of contaminated materials. Technicians remove severely damaged insulation or duct sections, clean salvageable wood using HEPA-vacuuming and antimicrobial treatments, and may sand or dry-ice blast rough lumber to remove deep growth. · Addressing the root moisture problem. There is no lasting benefit to removal if humidity and leaks are not fixed. Professional remediators locate and repair roof leaks, correct ventilation deficiencies, insulate or encapsulate ductwork, and may recommend installing a dedicated dehumidifier. Attic Mold Remediation in Myrtle Beach: Protect Your Air Before It’s Too Late Mold in the attic is more than a hidden blemish; it’s a whole-house problem that contaminates your air every time the HVAC kicks on. We’ve seen how spores spread through ducts, how moisture and poor ventilation create the perfect breeding ground, and why surface-level fixes never last. Together, these factors turn a neglected attic into a serious health and structural hazard. The takeaway is simple: attic mold remediation isn’t optional or cosmetic — it’s essential. Professional containment, thorough removal, and moisture control protect your family’s health, preserve your home’s integrity, and prevent the cycle from repeating. So when that musty odor lingers, don’t dismiss it. It’s your home’s way of warning you. Act now, and secure cleaner air and a safer house with professional attic mold remediation.