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How to Add an A/C to an Enclosed Trailer

Installing an air conditioner in your enclosed trailer will allow for a more comfortable stay inside the trailer. If you use your trailer for storage of temperature sensitive equipment, putting an air conditioner is the only way to ensure the proper temperature. Selecting a rooftop unit will provides the easiest and best cooling effect in the trailer. Installing the air conditioner can be challenging, but with the right tools, and basic mechanic skills, you can successfully install the cooling unit.

Rooftop air conditioners cool your entire trailer efficiently.

Step 1

Mark the opening hole on the top of the roof with the marker.  Use the template included with the air conditioner to mark the size of the opening. If your air conditioner does not come with a template, read the manual for the size of the opening. 

Step 2

Drill a hole with a metal drill bit on each of the corners of the marked opening on the top of the roof. 

Step 3

Cut open the hole in the roof with the reciprocating saw.  Insert the saw blade through the holes made with your drill, and cut along the marked lines.

Step 4

Place the top part of the air conditioner on the opening.  Secure it in place using the included fasteners, using the electric drill with driver bit or a screw gun. Read the manual for specific installation instructions, because they vary by vendor. 

Step 5

Seal the trim of the opening with silicone sealant.  Place a thin bead of silicone around the opening and the air conditioner to make a waterproof seal.

Step 6

Install the interior panel of the air conditioner inside the trailer.  Read the manual for directions, because installation methods vary widely by manufacturer.

Step 7

Plug in the air conditioner in a trailer outlet.  Turn on the unit and test it.

Things You Will Need

  • Marker
  • Electric drill
  • Metal drill bit
  • Reciprocating saw
  • Screw gun (optional)
  • Silicone sealant

About the Author

Louis Gutierrez began writing in 2010 for various websites, specializing in real estate, construction and electronics. He has over 10 years experience running and operating various successful businesses in these fields and holds a Bachelor of Arts in business administration, graduating magna cum laude from Florida International University.

Photo Credits

  • construction security, trailer image by Greg Pickens from Fotolia.com