Condensation on windows
Answer: call a hvac technician.
Persistent condensation, fog, or ice forming on the interior surfaces of windows during cold weather signals excessive indoor humidity. While occasional light condensation is normal, heavy or daily moisture on windows can cause wood frame rot, peeling paint, mold growth on sills and surrounding walls, and even damage to the wall cavity insulation. The root causes are usually inadequate ventilation, an oversized humidifier, bathroom or kitchen fans that aren't ducted outside, or a home that's been sealed too tightly without balanced air exchange. An HVAC technician can measure indoor humidity levels, inspect ventilation systems, and recommend solutions like balanced ventilation, dehumidifiers, or heat recovery ventilators.
Who to call
For this problem, call a: HVAC Technician
Symptoms to look for
- Water droplets or fog on the inside of window glass, especially in the morning
- Ice forming on the inside of windows during very cold weather
- Water pooling on window sills or running down walls below windows
- Mold or mildew spots on window frames, sills, or surrounding drywall
- Peeling paint or wallpaper near windows