Retrofit (verb)

To modify or add something to an existing system, structure or machine to improve or update it.

Origin:

From the prefix retro- (meaning "back" or "backward") and the verb fit. the word first appeared in english in the mid-20th century.

Examples:

1. The building was retrofitted with energy-efficient heating and cooling systems.
2. The car was retrofitted with a hybrid powertrain.
3. The airplane was retrofitted with new navigation systems.
4. The factory was retrofitted with new safety equipment.
5. The house was retrofitted with solar panels to generate electricity.