Keep the inside cool all day for next to nothing in energy costs. Preventing daytime heat build-up also cuts evening cooling costs. Cool or heat up to 750 Sq. Ft. (69m²). Augmenting a space heating or cooling system with solar makes perfect sense. In addition to heating or cooling a small area, it allows you to add capacity to an existing system, or reduce the load. Indoor Unit: Outdoor Unit: Please Note, PV wire, etc., is not included by default, it must be added on above. The ACDC12C installs just like a normal mini-split air conditioner, then you connect the solar panels using industry-standard MC4 connectors. You can.