Hi there can you please help me obtain the quote for the foll: 1) Cassette type for the living, dining and kitchen (one unit invertor) 2) System 3 Starmex invertor for 12k btu each 3) System 2 Starmex invertor for 12k btu each 4) System 1 Starmex invertor for 18k btu I'm open to suggestions re other brands more cost effective, electricity saving etc. What's the coverage for 12k btu? I'm not sure if it's sufficient also. Hopefully can reuse the existing piping but will need to run pipes for some additional units. thanks v m