Refrigerant Line Set

The refrigerant line set is the pair of copper tubes that connect your indoor air handler to the outdoor condenser unit. One line carries cold refrigerant to the indoor unit, and the other carries warm refrigerant back outside. They run through a small hole drilled through your exterior wall — usually around three inches — and are insulated to keep them working efficiently. The length and routing of the line set can vary depending on where you want the indoor and outdoor units placed. During installation, getting this part right matters for long-term performance.