Which is better: replacing the thermo unit or the entire window?

Whether it's better to replace just the thermo unit or the entire window will depend on the specific situation. Here are some factors to consider:

1. Condition of the window frame: If the window frame is damaged or in poor condition, it may be more cost-effective to replace the entire window rather than just the thermo unit.
2. Age of the window: If the window is old and nearing the end of its lifespan, it may be a good idea to replace the entire window rather than just the thermo unit. This can provide improved energy efficiency and may be more cost-effective in the long run.
3. Type of window: Some types of windows, such as custom or specialty windows, may be difficult or expensive to replace just the thermo unit. In these cases, it may be more practical to replace the entire window.
4. Budget: Replacing just the thermo unit can be a less expensive option than replacing the entire window. If budget is a concern, it may be more feasible to replace just the thermo unit.

Overall, it's best to consult with a professional to determine the best option for your specific situation. They can evaluate the condition of your window and provide guidance on whether replacing just the thermo unit or the entire window is the best choice.