Before your new window installation, you were likely looking forward to lower energy bills, noise reduction, and a boost in your home’s curb appeal.

If you’re questioning why your windows aren’t living up to your expectations, you may be the victim of an unprofessional window installation. Unfortunately, some inexperienced window contractors may leave your home with more problems than before your windows were replaced, like moisture damage, uncomfortable drafts, and foggy window panes.

Discover the warning signs of faulty window installation—and what to do if your windows suffer from these problems.

1. Noticeable Gaps

If your contractor properly measured for your new windows, they should fit comfortably between the windowsill and the frame. If you notice any gaps, this is usually a sign the either window wasn’t sized large enough to fit snugly in the frame or your contractor did not properly fit the windows squarely in the window to the opening.

2. Drafts

Modern windows are designed to increase your home’s energy efficiency and maintain a cozy indoor temperature by insulating your home. So, if you experience uncomfortable drafts inside your house or notice your utility bills have recently skyrocketed, you should ask an expert to evaluate your windows for shoddy installation.