Dometic Penguin II 15,000 BTU Heat Pump A/C 651916HXX1

The Dometic Penguin II 15K BTU heat pump rooftop A/C is the right choice when you need the maximum cooling capacity Dometic offers in their low-profile rooftop form factor, plus integrated heat pump functionality for shoulder-season heating without a separate furnace cycle. The unit ships as the rooftop assembly only - it pairs with a Dometic CT Single Zone wall thermostat and ceiling assembly (sold separately) to make a complete installed system.

The Penguin II low-profile design. The Penguin II shroud is the iconic Dometic rooftop A/C profile - 11-1/4 inches tall, sleek aerodynamic curve, white finish, no exposed mounting fasteners. The low-profile height matters for two reasons. One: wind resistance. A taller A/C shroud creates more aerodynamic drag at highway speeds, which costs fuel mileage on a tow vehicle pulling a trailer or on a motorhome. The Penguin II's profile is engineered to minimize the drag penalty - over the typical RV's lifetime, the fuel savings vs. a tall shroud aren't trivial. Two: clearance. Some campgrounds, storage facilities, and toll-road overpasses have height restrictions that a tall A/C shroud violates. The 11-1/4 inch profile fits where taller units don't.

15,000 BTU - the larger of two Penguin II sizes. Dometic offers the Penguin II in 13,500 BTU and 15,000 BTU versions. The 15,000 BTU model (this one) provides meaningfully more cooling capacity, which matters in three situations: hot southern climates (where you need the extra capacity to keep up with 95+ degree ambient temperatures), larger interior spaces (longer Class A motorhomes, large fifth wheels, dual-axle trailers with extended floor plans), and high humidity environments (the higher capacity unit pulls more moisture out of the air, improves comfort feel). For typical 22-30 foot trailers in moderate climates, the 13,500 BTU version is sufficient and saves slightly on power draw. For larger units or hot climates, the 15,000 BTU is the right call.

Heat pump function. The HXX1 designation indicates this Penguin II includes an integrated heat pump (the cool-only version uses different model numbers). The heat pump runs the refrigerant cycle in reverse to extract heat from outside air and deliver it to the interior - meaningfully more efficient than electric resistance heat (a heat pump delivers roughly 2-3 BTU of heat for every 1 BTU of electrical power consumed, where resistance heat delivers exactly 1 BTU per BTU). The heat pump is effective in shoulder-season conditions (40 to 60 degrees F outside) where the temperature differential lets the heat pump extract usable heat from the outside air. Below roughly 40 degrees F outside, heat pump efficiency drops and the typical RV install switches to the propane furnace for primary heat - the heat pump is the shoulder-season supplement, not the cold-weather primary heat source.

Ducted or non-ducted installation. The Penguin II works in either install configuration. Ducted installs run the cool / warm air through the RV / boat ceiling ducts to multiple registers throughout the interior - even temperature distribution and quieter at the supply register since the duct work attenuates the fan noise. Non-ducted installs use the included ceiling assembly to dump cool / warm air directly out of the ceiling at the A/C unit's location - simpler install, lower cost, and more direct cool air feel at the unit but uneven distribution to far corners of the RV. Most modern RVs are ducted, most older trailers and small boats are non-ducted.

Standard 14 x 14 inch vent opening. The Penguin II mounts in a standard 14 x 14 inch roof opening - the same opening size as the original Penguin and most other RV rooftop A/Cs. So the Penguin II is a direct retrofit replacement for older or failed Dometic and Coleman-Mach rooftop units without cutting a new roof opening (which is invasive and risks roof leaks). For new installs, the 14 x 14 cutout is the standard opening that any RV roof can accommodate.

120V / 12A power draw. The unit runs on standard 120V AC with a 12A average current draw under cooling load. Total power consumption is roughly 1,440 watts at peak. The startup current draw briefly spikes higher (the compressor inrush current can hit 25-40A for a fraction of a second). This means: you need at least a 20A 120V circuit dedicated to the A/C (the standard 30A RV pedestal connection runs the A/C plus the rest of the RV's loads simultaneously, the 50A pedestal connection runs two A/Cs in larger Class A motorhomes). For boats, a similar 20A 120V circuit from the shore power inlet handles the unit. Inverter / battery operation requires a heavy-duty 2,500W+ pure sine wave inverter with a sufficient battery bank - the high startup current is the limiting factor.

Built-in CT Single Zone electronic board. The unit has the CT Single Zone control board built in - the controller that interfaces with the wall thermostat and runs the compressor / fan / heat pump cycles. This board specifically requires the Dometic CT Single Zone wall thermostat (sold separately) and is NOT compatible with older mechanical thermostats or with other brand thermostats. The CT Single Zone thermostat is the simple wall-mounted unit with the LCD display, set-point buttons, and mode selector (cool / heat / auto / off). For multi-zone setups (two or more A/Cs controlled separately), use the Dometic CT Multi Zone variants.

What's NOT included. The wall thermostat (Dometic CT Single Zone, sold separately). The ceiling assembly (Dometic ceiling adapter for ducted or non-ducted setup, sold separately). The condensate pump (sold separately - the unit has gravity drain by default which works for typical roof installs, but condensate pump is needed if the unit can't drain by gravity). Power cabling and wiring (typically supplied by the RV / boat installer per local electrical code).

Refrigerant. The Penguin II uses R-410A refrigerant. R-410A is the modern HFC refrigerant that replaced the older R-22 (phased out under environmental regulations). The unit is factory-charged and sealed - no field refrigerant work required at install. If the system ever needs refrigerant service, an EPA Section 608 certified HVAC technician handles the work.

Install. The 1.5-hour estimated install time is for a competent RV / boat installer doing a direct retrofit of an existing 14 x 14 roof opening - removing the old A/C, drop the new A/C through the roof opening from the top, secure the ceiling assembly from the inside, connect the 120V power and the thermostat wiring. For new installs that require cutting a fresh roof opening, install time runs 4-6 hours. The unit is heavy (99 lb shipping weight) and requires two people to lift onto the roof and through the opening.

Two-year limited warranty. Standard Dometic warranty terms apply. This is a heavy-freight item that ships LTL freight rather than parcel - additional freight surcharges may apply for residential delivery. MAP-enforced pricing.