Short Answer
Replacement may be appropriate when windows have failed seals, drafts, deterioration, water intrusion, damaged frames, operational problems, poor energy performance, obsolete components, or significant maintenance requirements.
Detailed Explanation
Window replacement is a significant investment, so it's important to distinguish between windows that need replacement and those that need repair or maintenance. Signs that replacement may be warranted include: fogging or condensation between double-pane glass (indicating failed seals), persistent drafts that can't be fixed with weatherstripping, rot or deterioration of wood frames, water intrusion during rain, windows that won't open, close, or lock properly, single-pane windows with no storm windows, and windows that require constant maintenance. Some of these problems (weatherstripping, hardware) can be repaired; others (failed seals, rotted frames) typically require replacement.
Why It Matters
Replacing windows that could be repaired wastes money, but keeping windows that need replacement leads to energy loss, discomfort, and potential water damage.
When Repair Makes Sense
Problems are limited to weatherstripping, hardware, or single-pane glass that could be upgraded with storm windows.
When Replacement Makes Sense
Windows have failed seals, rotted frames, water intrusion, or are single-pane with poor energy performance.
Questions to Ask Your Contractor
- ?Can these windows be repaired, or do they need replacement?
- ?What's the energy performance of my current windows?
- ?Are the frames in good condition?
- ?What's the expected return on investment from energy savings?