We’ve sized our outdoor units to power up to three indoor units, a ratio that delivers the right mix of efficiency, control, redundancy and modularity. Smaller outdoor units like ours are more compact, quiet, and efficient than larger units, ultimately saving homeowners energy and money. When installed in a full home, they also more completely deliver on the promise of room-by-room control, enabling some rooms to be heated while others are cooled, which can’t be done with one large outdoor unit. The flexibility of smaller systems also means that they give full homes the benefit of the redundancy of multiple outdoor units, while also making it possible to install Quilt in one, two or three rooms, then expand to full home coverage over time.