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nucamprv.com • Truck Campers
• Generally, RV air conditioners are only designed to cool the inside air approximately 20° F lower
than the outside air. This is not a defect. In temperatures of 100° F or higher, such as in the
southwest United States, this should be taken into consideration.
• Keep windows and other vents closed when operating the air conditioner.
• Hot air rises and cool air drops. The air conditioner air intake is by the ceiling where all the
hottest air gathers. The air conditioner gathers the rising warm air, cools it (creating
condensation and discharging water on the roof) and then ejects the air by the ceiling where it
circulates downward.
• Never close or obstruct the air intake. This will cause the air conditioner to malfunction and slow
down cooling.
• Never allow the air conditioner to run without a return air filter. Without the filter, lint and debris
will gather on the cooling coil. Damage and loss of air volume can result. This can ruin the air
conditioner or at the least, be an expensive repair.
• The air conditioner normally causes water to gather on the roof. To remedy this, lift the front of
the camper to allow water runoff to the rear.
When camping in hot weather, especially during the day, the camper will absorb heat from the sun and
the surrounding atmosphere. This is known as heat gain. If you can reduce this, especially in extreme
hot weather, you have won half the cooling battle.
To reduce heat gain and increase air conditioner cooling in high temperature weather:
• Seek shaded areas to park your camper, such as beneath trees.
• Close all windows, shades and curtains. For an extra heat shield, insert an automotive windshield
sun shade, cut to size, into each of the windows. Some shades may have a reflective coating on
the exterior side already.
• Keep heat emitting appliances such as the Alde
®
System, stovetop and microwave turned off.
• Extend any equipped awnings. This will shade the sides of the camper from sun exposure.
• Start the air conditioner early in the morning to give it a head start on the day.
• Turn the air conditioner on its highest setting.
Refer to the air conditioner(s) operator manual for detailed operating instructions. These are included in
your Owner’s Packet. Online information on your specific Air Conditioner may also be found at this link:
https://www.airxcel.com/rv/coleman-mach/products/air-conditioners/ultra-low-profile/mach-8/mach-8-
ac
FAN VENTILATION
The fan vent(s) installed in the roof creates fresh air circulation and removes stale air from the camper. It
is powered by 12V or shore power and may be equipped with either manual or remote controls.
• Always ventilate the camper while sleeping.
• The fan will not ventilate well if an air inflow source such as a window is not opened. For best
ventilating results, open a window the farthest distance from the fan so air can flow through the
entire camper.
• See operating instructions of the fan vent included in the Owner’s Packet.
