I have a 2 story house and I want to replace our old window AC. I was initially thinking of replacing it by a single heat pump unit, but in order to get government funding, I would need to get one heat pump per floor. I calculated that it would cost me around $1000 more to have the 2 units system and I was wondering if it would be worth it in the long run.
So, my question is : will cooling the house in summer and heating it in winter be more energy efficient with a 2 units system?
(currently, my house is heated by electric baseboard heaters and cooled by a 12 000 BTU window AC)