ductless heat pump

One MRCOOL DIY condenser can run up to six rooms. Here is how to choose the condenser, match the air handlers and avoid the combinations MRCOOL does not support.

Too small and a mini split never catches up. Too big and it short-cycles and leaves the room clammy. Here is how to pick the right BTU size and voltage for your space.

MRCOOL sells four mini split lines that look alike in photos but differ on who can install them, how cold they heat and how long the warranty runs. Here is how to pick the right one.