We are adding a garage with an office above it for my husband. We are trying to determine which will be the best source for heating and cooling. We prefer a heat pump system due to energy efficiency. Can anyone help answer which is the better product and the better manufacturer?

We have looked at Continental Electric 18,000BTU, Soleus 12,000BTU mini split and the Carrier 12,000BTU and the Amana 12,000BTU PTAC.

The room size is ~390sf.

Thank you.