Coleman RV Air Conditioners

Which Coleman Mach RV air conditioner fits my rig?

Match three things before ordering: BTU rating (13,500 or 15,000 for most coach applications), roof opening (the standard 14" x 14" vent cut works for Mach 3, Mach 8, Mach 10, and Mach 15), and ducted vs. non-ducted distribution. The Mach 15 (38204-066) delivers 15,000 BTU and uses R32 refrigerant, making it the highest-output unit in the Mach Series. If you run ducted air through the ceiling, pair the rooftop unit with a Coleman ceiling assembly for ducted installations or the Coleman Power Saver HP ducted ceiling assembly to complete the install.

What is the difference between Coleman Mach 3, Mach 8, Mach 10, and Mach 15?

The Mach 3 Plus is a 13,500 BTU standard-profile workhorse. The Mach 8 is a low-profile 13,500 or 15,000 BTU unit built for height-sensitive coaches. The Mach 10 sits between them with a quieter fan and 13,500 BTU output. The Mach 15 is the 15,000 BTU high-output model for hot-climate cooling and larger floor plans. All four mount to the standard 14" x 14" vent opening, so the swap is mostly an electrical and ceiling-assembly decision rather than a roof modification.

Do Coleman Mach units need a separate ceiling assembly?

Yes. The rooftop unit handles the compressor, condenser, and evaporator, but the air distribution and thermostat control come from a ceiling assembly mounted to the interior side of the roof opening. Choose ducted if your coach has overhead air ducts running through the ceiling, or non-ducted if the air discharges directly from the assembly into the living space. Browse the Coleman ducted ceiling assemblies to complete a Mach installation.

Can I run a 15,000 BTU Coleman Mach on a 30-amp service?

Yes, a single Mach 15 will run on 30-amp shore power, but startup inrush current can trip breakers when other loads (microwave, water heater on electric, converter charging) are active at the same moment. A soft start kit reduces inrush current up to 75% and is the standard fix for nuisance trips on 30-amp pedestals and generator use. For surge and low-voltage protection at the pedestal, see our RV electronics collection.