Learn how double-hung windows work, how to fix common problems, and when calling a trusted Simi Valley professional is the safest and most cost-effective option.
By Dan Burlingham
Double-hung windows are a popular choice in Simi Valley homes for their classic appearance, ventilation, and ease of cleaning. Over time, however, even well-built windows can become difficult to operate, drafty, or inefficient. Understanding how these windows work and which repairs are realistic for homeowners can help you protect comfort, safety, and long-term home value.
How Double-Hung Windows Work
A double-hung window has two operable sashes, one on top and one on the bottom, that slide vertically within the frame. Each sash is supported by a balance system, typically spring-loaded or block-and-tackle balances, which counteract the weight of the glass so the window stays open where you place it.
Key components include:
- Upper and lower sashes
- Balance systems or sash cords
- Tracks and jamb liners
- Locks, weatherstripping, and stops.
When one of these components fails or wears out, the window can become hard to open, refuse to stay up, or let unwanted air in.
Common Double-Hung Window Problems
Homeowners often notice issues gradually, especially in older homes throughout Ventura County.
Typical problems include:
- Sashes that stick or bind when opening
- Windows that slide down instead of staying open
- Broken or worn balance systems
- Drafts caused by damaged weatherstripping
- Cracked or foggy glass from seal failure
If you notice cracked glass, addressing it early with professional window glass crack repair can help prevent larger structural or safety issues later on.
Safety Precautions Before You Start
Before attempting any window repair, safety should be the top priority. Double-hung windows contain heavy glass and spring-loaded parts that can cause injury if handled improperly.
Always:
- Wear cut-resistant gloves and eye protection.
- Support the sash securely before removing hardware.
- Avoid forcing components that feel jammed or unstable.
- Stop immediately if the glass is cracked or loose and seek professional help.
If glass damage is involved, it is safer to consult a licensed glass specialist rather than attempting a temporary fix.
How to Fix a Stuck or Hard-to-Open Window
A sticking sash is often caused by dirt buildup, paint, or minor frame swelling.
Steps homeowners can try:
- Clean the tracks thoroughly with a vacuum and mild cleaner.
- Check for paint sealing the sash to the frame, and carefully score it with a utility knife.
- Apply a silicone-based lubricant to the tracks.
- Inspect for warped wood or damaged vinyl that may require professional adjustment.
If the sash still resists movement, forcing it can damage the balances or glass, increasing repair costs.
Repairing or Replacing Window Balances
When a window will not stay open, the balance system is usually the problem. While replacement kits are available, matching the correct balance type and weight rating is critical.
DIY replacement may be appropriate if:
- The balance type is clearly identifiable.
- The window frame is in good condition.
- No glass damage is present.
For older windows or custom sizes common in Simi Valley homes, professional repair ensures proper tension, smooth operation, and long-term reliability.
Addressing Drafts and Air Leaks
Drafts not only reduce comfort but also increase energy costs, especially during Southern California temperature swings.
Homeowner-friendly fixes include:
- Replacing worn weatherstripping
- Ensuring locks pull the sashes tightly together
- Sealing minor gaps with appropriate window caulk
Persistent drafts may indicate frame distortion or failed seals that require professional evaluation rather than surface-level fixes.
Glass Repair vs. Full Window Replacement
Not every damaged window needs full replacement. In many cases, replacing the glass alone restores safety and performance while preserving the original frame.
Glass repair is often sufficient when:
- The frame is structurally sound.
- Only one pane is cracked or broken.
- The window is otherwise operating properly.
If multiple components have failed, or the window no longer meets modern efficiency standards, replacement may be the smarter long-term investment.
Energy Efficiency for Southern California Homes
Energy-efficient windows play a major role in maintaining indoor comfort and managing cooling costs. Features such as double-pane glass, low-E coatings, and proper sealing are especially valuable in the Simi Valley climate.
The U.S. Department of Energy explains how efficient windows reduce heat transfer and improve overall home performance, which is why professional repairs and upgrades can have lasting benefits for comfort and resale value.
When to Call a Professional in Simi Valley
DIY repairs make sense for basic maintenance, but professional service is the safer choice when:
- Glass is cracked, broken, or fogged.
- Balances or frames are damaged.
- Windows are custom-sized or older.
- Safety, efficiency, or home value is at risk.
Community Glass & Mirror has served Simi Valley since 1960, providing licensed, insured, and detail-focused window repair backed by decades of hands-on experience.
Conclusion
Fixing a double-hung window starts with understanding the problem and knowing your homeowner’s limits. Simple cleaning and lubrication can restore smooth operation, but balance failures, drafts, or glass damage are best handled by professionals. If your window issue involves cracked glass or safety concerns, contact Community Glass & Mirror for trusted window glass crack repair that protects your home, comfort, and investment.
About the Author
Dan Burlingham is the owner of Community Glass and Mirror. He is also still the man who comes to your home to give quotes for the work and keeps the company running smoothly with all its employees. Being a locally owned company means you have someone to turn to if you ever have a problem. Dan has carried the traditions of high-skilled custom glass and mirror work for residential and commercial work.