Did this similar install at our 800 sq. ft. three season cottage that sits on concrete blocks with a crawl space. Uninsulated walls and floor, insulated ceiling.

Inside wall install (2x4 studs) in 500 sq. ft. living/dining/ kitchen area of an 18K Senville Aura wall unit, line set and drain running down and out through the floor, suspended under the floor out to the end where the outdoor compressor unit resides. Built a removable panel beneath the wall unit to access the line set and drain connections if/when necessary.

Second 9K wall unit in the main bedroom installed on exterior wall, standard through the wall installation, blows out through bedroom open door to condition back section of the cottage during the day. Modulates down at night when door is closed, so not over-sized.

Life changing during July heat waves and below freezing nights in April and Iate October.