The EROMMY with heat pump lists 10,000 BTU of cooling and 6,120 BTU of heating from a 12V DC rooftop unit, which is the most capable heating rating in this guide. A heat pump moves heat rather than burning it, so in mild weather it warms the cabin for far less current than a resistance heater. The brushless fan and auto swing louver spread air across a small cabin evenly.
The weakness is the one every 12V AC shares: it is a high-current load. Even with an inverter-style compressor, plan for something like 25 to 55 amps at 12 volts, depending on fan speed and load, and make sure your cable, fuse and battery bank can supply it. Heat pump output also falls as outside temperatures drop toward freezing, so it is a shoulder-season heater, not a winter solution. Compared with the resistance-heater units here, it does more with less current; compared with the plain Countrymod, it gives you heating at a modestly higher tier.
Ownership is mostly roof care. Keep the condenser fins clean, check the gasket seal each spring and verify that the battery low-voltage cutoff is set so the unit cannot drain your bank to damaging levels. A refrigerant leak is a technician job, so register the warranty on day one.
What works
- 6,120 BTU heat pump rating
- Brushless fan and auto swing louver
- Runs on 12V DC without an inverter
- Cooling and heating in one box
Watch out for
- High amp draw demands heavy cable
- Heat pump weakens near freezing
- Newer brand with limited service network
Spec sheet
- Cooling
- 10,000 BTU
- Heating
- 6,120 BTU heat pump
- Power
- 12V DC
- Fan
- Brushless
- Airflow
- Auto swing louver






