Does this need a special kit to install horizontally

No special kit is required to install this equipment setup horizontally. The RunTru/Trane 95% gas furnace (A951X080BU4SA) and the indoor cased coil (5MXCB006AC6HCA) are both factory-rated multi-positional units designed to accommodate horizontal airflow out of the box.

If you have any further questions, please call us and we will be happy to assist you.