How do I know what size system my house needs?

 How do I know what size system my house needs?
To be sure you get a system that best suits your needs, consult with one or more
registered installers before purchasing a system.
Q: What is a Registered Installer?
A registered installer is a contractor who has registered with Efficiency Maine to
install ductless heat pumps. In order to register, the contractor must agree to follow
Efficiency Maine’s Code of Conduct, has shown proof of insurance, has completed
Energy Star Heat Pump Manufacturer installation training, and has EPA Section 608
Refrigerant Handling certification.