RV Heat Pump Amp Draw: How Many Amps Does Your Unit Use?

Understanding Heat Pump Power Consumption

Heat pumps in Class A motorhomes are usually either 13,500 BTU or 15,000 BTU units, most commonly manufactured by Dometic or Coleman. Here's what you can expect for amp draw:

• 13,500 BTU units: 12-14 amps running, 2-3 amps fan only
• 15,000 BTU units: 14-16 amps running, 2-4 amps fan only
• Startup surge: 30-50 amps for 3-5 seconds
• Defrost cycle: May briefly spike to 18-20 amps

The heat pump doesn't run continuously - it cycles on and off based on your thermostat settings. When just the fan is running to circulate air, it only draws 2-4 amps. The big power draw happens when the compressor kicks in for actual heating or cooling.

Managing Your 30-Amp Electrical Load

While your heat pump fits comfortably within 30-amp service, you need to consider your total electrical load. Here's how to manage it effectively:

High-Draw Appliances to Watch

• Electric water heater: 8-12 amps
• Microwave: 10-15 amps
• Hair dryer: 12-15 amps
• Space heaters: 10-12 amps
• Coffee maker: 8-10 amps
• Converter/charger: 3-8 amps

The key is avoiding running multiple high-draw appliances simultaneously with your heat pump. For example, if your heat pump is drawing 15 amps and you try to run a 12-amp microwave, you're at 27 amps - dangerously close to your 30-amp limit.

Measuring Your Actual Amp Draw

Since heat pump efficiency varies with age and conditions, measuring your actual consumption is valuable. You'll want to check both the running amps and startup surge.

1. Install a digital amp meter on your main electrical panel (with power off and proper electrical safety precautions) or use a clamp-on ammeter at the heat pump's electrical connection
2. Turn off all other 120V appliances and lights
3. Set your thermostat to trigger the heat pump
4. Watch the meter when the compressor starts - note both the surge and running amps
5. Test in both heating and cooling modes, as amp draw can vary
6. Check the fan-only mode by setting the fan to "on" instead of "auto"

Factors Affecting Power Consumption

Several factors influence how many amps your heat pump actually draws:

Temperature Differential

The bigger the difference between outside temperature and your desired indoor temperature, the harder your heat pump works. On extremely hot or cold days, expect higher amp draw and longer run times.

Unit Age and Condition

Older heat pumps or those needing maintenance draw more power. Dirty coils, low refrigerant, or worn components increase electrical consumption. A well-maintained newer unit will be more efficient.

Voltage Variations

Low voltage increases amp draw. If you're getting 108V instead of 120V at your pedestal, your heat pump will draw more amps to do the same work. Always check your incoming voltage with a multimeter.

Troubleshooting High Amp Draw

If your heat pump seems to be drawing excessive power, here are common causes:

• Dirty air filter: Replace every 30 days during heavy use
• Blocked return air: Ensure vents aren't covered by furniture or curtains
• Dirty evaporator coils: Clean annually or have professionally serviced
• Low refrigerant: Requires professional diagnosis and repair
• Failing capacitors: Can cause high amp draw and poor performance

Heat Pump vs. Furnace Power Usage

Many Class A owners don't realize they have options for heating. Your RV likely has both a heat pump and a propane furnace. The furnace only draws 3-8 amps for the blower motor and ignition system, making it more electrical-friendly for 30-amp service. However, heat pumps are more efficient in moderate temperatures and don't consume propane.

When to Call a Professional

Contact an RV technician if you notice:

• Amp draw suddenly increases significantly
• Frequent breaker tripping when the heat pump starts
• Unit short-cycling (turning on and off rapidly)
• Unusual noises during operation
• Ice formation on coils during heating mode
• Burning smells from the unit

Prevention and Maintenance Tips

Keep your heat pump running efficiently with regular maintenance:

• Replace air filters monthly during use
• Keep outdoor coils clean and unobstructed
• Schedule annual professional service
• Use a surge protector to prevent electrical damage
• Consider upgrading to 50-amp service if you frequently max out your electrical capacity

Since you're still getting familiar with your Class A, take time to understand your electrical system. Many owners find that upgrading to 50-amp service gives them much more flexibility with appliance use, though 30-amp service is perfectly adequate for most situations with proper load management.

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