Windows do much more than let light into your home. They control heat, manage moisture, provide ventilation, and protect the structure around them. When windows are neglected, small issues can quietly turn into drafts, rot, mold, and energy loss.

The good news? Basic window maintenance is simple, inexpensive, and can significantly extend the life of your windows—old or new.

Poorly maintained windows can lead to:

• Air leaks and uncomfortable drafts
• Condensation and hidden moisture damage
• Wood rot in sills and framing
• Higher heating and cooling bills
• Mold growth around window openings
• Premature window failure and costly replacements

Windows are part of your home’s building envelope—when they fail, the home suffers.

From an inspection perspective, these issues show up again and again:

• Failed seals in double-pane windows (fogging or moisture between glass)
• Dried, cracked, or missing exterior caulking
• Paint failure and exposed wood on sills
• Poor drainage from clogged weep holes
• Windows that won’t open, close, or lock properly
• Condensation caused by indoor humidity, not bad glass

Many of these problems start small and are easily preventable.

• Wash glass inside and out at least twice per year
• Clean dirt and debris from tracks and sills
• Avoid pressure washing directly at window seams

Clean windows reveal early warning signs before damage sets in.

• Check caulking around window trim annually
• Look for cracking, gaps, or separation
• Re-caulk as needed using exterior-rated sealant

Caulking keeps bulk water out—when it fails, moisture gets in fast.

• Inspect wood sills and trim for peeling paint or softness
• Touch up paint to protect exposed wood
• Address rot early before structural repairs are needed

Paint isn’t just cosmetic—it’s protection.

• Many vinyl and aluminum windows have small drainage holes
• Use a soft brush or compressed air to keep them open
• Never seal or paint over weep holes

Blocked weep holes trap water inside the window system.

• Open and close each window fully
• Confirm locks engage properly
• Lubricate tracks and hardware if needed

Windows should operate smoothly—sticking windows often indicate movement or moisture issues.

Condensation doesn’t always mean window failure.

• Interior condensation often points to high indoor humidity
• Between-pane condensation usually indicates seal failure

Managing humidity through ventilation and bath fans can protect windows and indoor air quality.

Spring

• Inspect caulking and paint after winter
• Clean tracks and sills

Summer

• Monitor humidity levels indoors
• Use window coverings to reduce heat gain

Fall

• Seal air leaks before cold weather
• Ensure windows latch tightly

Winter

• Watch for condensation and frost buildup
• Avoid sealing windows shut with plastic unless necessary

Repair may be appropriate when:

• Caulking or weatherstripping has failed
• Hardware is worn or broken
• Paint or trim damage is localized

Replacement may be needed when:

• Multiple panes have failed seals
• Frames are rotted or structurally compromised
• Windows are inefficient single-pane units throughout the home
• Windows are cracked and slam shut

An inspection can help determine whether repair or replacement makes the most sense.

Windows are one of the most common places for moisture intrusion and air leakage. Maintaining them protects:

• Indoor comfort
• Energy efficiency
• Structural components
• Indoor air quality

A well-maintained window doesn’t just look better—it helps your home last longer.

Window maintenance isn’t complicated, but it is critical. A few minutes of inspection each year can prevent thousands of dollars in repairs and keep your home comfortable, dry, and efficient.

If you’re unsure what you’re seeing—or want a professional set of eyes—this is exactly the type of issue a home inspection is designed to catch early.

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