Ductless Heat Pump Installation - Email to set up personalized quote - Specializing in ductless heat pumps - Quality Brands - Prompt and courteous service - Competitive pricing 1000's in rebates may be available to qualified homeowners. Visit CleanBC Better Homes for details. *Homeowner is responsible for applying. How It Works In a mini-split system, a small heat pump compressor unit sits outside of your home. Connected to the outdoor unit are thin pipes filled with a refrigerant liquid. Similarly, to a heat pump, the pipes transfer the refrigerant in either a liquid or gas form. The refrigerant pipes break off to the separate rooms to be heated or cooled. The thin pipes are fed through the walls to connect to a small head unit mounted on an interior wall. A head unit containing a fan, blows across the refrigerant pipes, delivering hot or cooled air into the rooms.