How to Install an A/C Package Unit

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A/C units provide the modern benefit of central cooling air in buildings.
A/C units provide the modern benefit of central cooling air in buildings. (Image: Comstock/Comstock/Getty Images)

An A/C package unit involves an entire air conditioner unit with all the necessary equipment included to hook it up to a building ventilation system. All the owner needs to do involves preparing a cement bed for the unit to sit on and arranging the actual connection work. Because the units come pre-packaged, they make great appliances for mobile residences as well as roof-top A/C needs. With a bit of help from an electrician, the unit can be set up and running within a few hours.

Things You'll Need

  • Equipment dolly
  • Wood beams
  • Rebar
  • Concrete mix
  • Water
  • Refrigerant
  • Duct tape
  • AC technician’s assistance
  • Electrician’s assistance

Locate the ventilation intake hookup on the outside of the building the A/C unit will be added to. Determine the best location where to sit the A/C unit. Build a wood frame with 2x4 wood beams in the form of a square large enough to fit the A/C unit shape.

Mix some quick-setting concrete in a bucket with water. Lay down rebar in the wood frame area. Pour the concrete into the frame and smooth it out. Let the concrete dry.

Go to a local hardware/appliance store and purchase an A/C package unit. Transport it with a truck back to your location. Load the unit off the truck and onto an equipment dolly. Wheel it over to the cement pad that is now dry and cured.

Place the unit on the cement pad. Unwrap the shipping packaging and expand the wiring and connectors for the unit. Hire an electrician to wire and connect the A/C unit to the building’s electrical grid.

Look for the A/C air hosing. Connect this to the building’s ventilation intake conduit. Seal the hose to the building with vent duct tape and sealant.

Call an A/C technician to perform the final check on the unit and charge it with refrigerant. With the A/C technician present, test the system. Troubleshoot any problems. Enjoy the working A/C unit once the installation is finished.

Tips & Warnings

  • Lift with a partner when positioning the A/C unit off of the truck or onto the cement pad. This will prevent suffering a serious lifting injury to your back.
  • Do not fiddle or try to force position any of the A/C unit coils. These parts can easily break, allowing refrigerant to escape immediately. Such a repair can then be very costly.

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