What to know about the service life of windows

What to know about the service life of windows

When choosing PVC windows, price and appearance matter — but the real question is how long the window will perform reliably. This guide explains the factors that determine service life, typical lifespans for profiles, glass units, and hardware, maintenance tips, and when replacement is more economical than repair.

Key factors that affect service life

• Profile material (PVC, aluminum, wood). High‑quality PVC profiles can last for decades with proper care.
• Quality of the insulated glass unit (IGU): number of chambers, glass type, edge sealing, and gas filling.
• Hardware: hinges, handles, locking mechanisms wear out with use.
• Installation quality and sealing. Poor installation shortens life and reduces airtightness.
• Climate and operating conditions: temperature swings, coastal salt air, and high humidity accelerate wear.
• Maintenance: regular lubrication, cleaning drainage channels and checking seals extend lifespan.

Typical lifespans by component

• PVC profile: 30–50 years under normal conditions and with quality manufacturing.
• Insulated glass unit (IGU): 15–30 years; edge seal and gas retention determine longevity.
• Hardware: 5–20 years depending on quality and usage; regular maintenance helps.
• Seals and gaskets: 5–15 years depending on material and exposure.

Note: warranty periods differ from actual service life. Warranties typically range from 2 to 10 years, while service life can be much longer with proper care.

Signs that a window needs repair or replacement

• Persistent drafts and loss of airtightness.
• Condensation between panes — a sign of IGU failure.
• Difficulty opening/closing, loose handles, or sagging sashes.
• Deteriorated or hardened seals, cracks in the profile.
• Noticeable loss of thermal or acoustic performance.

How to extend the service life: practical tips

• Inspect and lubricate hardware annually; in aggressive climates, do it twice a year.
• Avoid harsh chemical cleaners on seals and profiles.
• Fix leaks and sealant failures around the frame promptly.
• Ensure proper indoor ventilation to reduce condensation stress on windows.
• Use original or manufacturer‑recommended spare parts for repairs.

When replacement is better than repair

• Repeated IGU failures that cannot be solved by repair.
• Widespread wear of hardware and seals across multiple sashes.
• Deformation or cracking of the profile reducing thermal performance.
• Desire to significantly improve energy efficiency with modern glass and frame systems.

Buying tips to maximize service life

• Choose profiles from reputable manufacturers with verified test results.
• Check glass specifications: low‑E coatings and gas fills prolong IGU performance.
• Request written installation reports and care instructions.
• Clarify warranty terms for profile, IGU, and hardware separately.

Frequently asked questions (FAQ)

How long do PVC windows last?

Typically, PVC profiles last 30–50 years, IGUs 15–30 years, and hardware 5–20 years. These are averages; actual life depends on product quality, installation, and maintenance.

What indicates an IGU has failed?

Condensation between panes is the most common sign. Other indications include reduced sound insulation and visible moisture build‑up that doesn't clear with normal use.

Can IGU life be extended?

Proper use and environmental control (reduced humidity and temperature fluctuations) help, but once the IGU has lost its seal, replacement is usually the most reliable fix.

How often should hardware be maintained?

At least once a year; in harsh climates or intensive use, twice a year is recommended.

Does installation affect service life?

Yes. Poor installation can introduce stress on sashes, reduce airtightness, and accelerate wear — making professional installation crucial.

Is it cost‑effective to replace windows early?

If windows cause high heat loss or need frequent repairs, replacing them with energy‑efficient units often pays off through lower heating bills and improved comfort.

Conclusion

The service life of a window is the sum of material quality, installation, and ongoing care. Choose reliable components, ensure correct installation, and perform regular maintenance to extend the life of your windows and save on energy costs over time.