We had three 6k BTU units, one 12k BTU unit, and one 18k BTU unit and the total cost was ~$18k. We got $1,600 in rebates from the utility for the energy efficie

We had three 6k BTU units, one 12k BTU unit, and one 18k BTU unit and the total cost was ~$18k. We got $1,600 in rebates from the utility for the energy efficiency program. I am very impressed with how little electricity they use!