Do it Yourself Ductless Mini-Split

Install the outdoor concrete pad if you do not have a stable base outside and don't want to place the compressor, which is also the condensor, unit directly on the grass. Dig into the ground an inch. Nail the four boards together into a square and fit the frame into the open area you created.

Mix the concrete in the bucket by following the manufacturer's instructions. Pour the concrete into the wood frame and smooth the surface with the trowel. Let the concrete dry and cure. Remove the wooden boards. Place the compressor on top of the new concrete pad.

Go over the wall with a stud finder. Locate a space without any studs, wiring or pipes. Drill a hole through the wall of your home to run the copper lines and drain tube. Use a jigsaw for most walls of wood and aluminum siding. A hammer drill is appropriate if the walls are masonry, such as brick or concrete.

Place the ductless mini-split onto the inside wall. Screw in the metal back plate into the wall. Attach the unit by following the guidelines for the kind of mini-split you purchased.

Run the copper lines and the drain tube through the hole going outside. Have the HVAC company perform the final installation by releasing the refrigerant and vacuuming the lines. Ensure all the tubing is checked for leaks and the unit is working properly before paying the HVAC worker.

Repair the hole in the wall. Purchase spray foam insulation. Apply the insulation around the drain tube and copper lines. Seal as much of the hole as possible to protect the inside of your home from adverse weather conditions.