What are the Downsides of Mini Splits?

While installing a ductless mini split on an interior wall is a viable option for many homes, it does introduce specific challenges and requirements compared to standard exterior wall installations:

• Complex Routing: Because the unit is not on an outside wall, routing the refrigerant line set and electrical wiring through interior walls or ceilings requires significant additional planning.
• Drainage Management: Condensate drainage is more difficult on interior walls. You must ensure a constant downward slope (at least a 1% grade) for gravity drainage, or you may need to install a condensate pump to move water away, which adds complexity to the system.
• Structural Support: The chosen wall must be perfectly level and strong enough to support the unit’s weight. If a wall bows or dips more than 1/8 inch, the unit may vibrate or pull away from the wall over time.
• Space Constraints: You must maintain strict clearances—typically 6 to 8 inches from the ceiling and 4 to 6 inches from corners—to ensure proper airflow and service access. Obstructions like furniture or curtains placed within 12 inches of the unit can lead to uneven heating and cooling.
• Potential for Damage: Professional installation is vital to avoid drywall damage or accidental contact with hidden plumbing and electrical infrastructure during the mounting process.

• Can a Ductless Mini Split Be Installed on an Interior Wall?