I recently asked for recommendations for multi-zone heating in a small home (intended for college students). The responses overwhelmingly recommended multi-zone mini split systems. I fully agree, my question here is about how to implement this. If you disagree, please direct comments to the thread below.
Here is the situation. I've plugged the home into a few online calculators which estimate heating and cooling load requirements between 30,000 and 32,000 BTU's. Obviously these calculators are making the assumption of free airflow. The rough layout of the house is something like this
Floor 1 Floor2 -/ ------------- ---------------- | | | | | | LR | | BR2 | | |___________| |_/ ___________| |Ξ | | |Ξ | BR3 | |Ξ \ BR1 | |Ξ /__________| |Ξ |___________| |Ξ / BATH | |Ξ | BR| |Ξ |__________| | /___| |/ _| | | KIT | | BR4 | | / | | |______________| |______________|
There is a basement as well, open. As long as I can keep it above 50 to protect the pipes, I'm not too concerned.
The smallest evaporator I have seen for these systems is 9000BTU. Way to large for a bedroom, but four of them is also borderline too large for the entire home. Unless of course, I can get proper airflow. One of the things I have considered is a series of vents between various rooms, such as between BR3 and the bathroom or BR4 and the kitchen. Something else I considered is open transom's above all the doors.
Any thoughts or better ideas? I worry about the rear of the first floor not getting enough heat. I guess a 5 zone system is an option as well.