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You'll need sufficient wall space adjacent to your garage opening to accommodate the full width of the door when open. The exact requirements depend on your specific door configuration and track system. Before committing to a side sliding door, have a professional evaluate your garage layout to confirm compatibility. They can determine if your space can accommodate the hardware and movement path necessary for proper operation.

Side sliding garage doors may offer improved energy efficiency depending on their construction and installation quality. A properly installed sliding door with appropriate weather sealing can help minimize drafts and heat transfer. 

For maximum energy performance, consider models with insulation appropriate for your climate. Consulting with a garage door specialist can help you select the right configuration for your specific needs.

The durability of side sliding garage doors depends primarily on construction quality, installation expertise, and ongoing maintenance. Regular inspection and maintenance of tracks, rollers, and other moving components will help ensure smooth operation. 

Different materials offer varying durability characteristics—metal options require less maintenance than wood alternatives, which may need periodic refinishing to maintain their appearance and protection against the elements.

Converting from an overhead to a side sliding garage door requires significant modifications to your garage structure. This process involves removing the existing overhead system and installing new tracks and hardware for the sliding mechanism. 

The feasibility depends on your garage's specific layout and wall space availability. Consultation with a garage door professional is essential to determine if your space can accommodate such a conversion and to understand the full scope of work required.