What is a symptom that indicates poor sealing at windows?

The presence of condensation that cannot be wiped off is a strong indication of poor sealing at windows. When windows are sealed poorly, humid air can infiltrate the space between the window panes or around the frame, leading to moisture build-up. This moisture condensation not only signifies that the seal is compromised but also suggests that there may be issues related to thermal performance within the window unit. Properly sealed windows typically prevent external humidity from condensing on the interior, indicating that if condensation is persistent and not removable, there is likely a failure in the seal that needs to be addressed.

In contrast, while drafts at the frame, poor insulation, and peeled paint around windows can also suggest issues, they are not as direct a symptom of sealing problems specifically. Drafts can arise from gaps or faulty installation, poor insulation relates more to the overall thermal performance of a space, and peeled paint is often a sign of moisture or improper surface preparation rather than an immediate indicator of sealing effectiveness. Condensation that cannot be wiped off provides a clearer, direct link to the failure of seals around windows.