Avoid Fall Energy Spikes: Preventive Maintenance Guidelines for Your All-Electric Heat Pump

As the crisp autumn air arrives across West-Central Missouri, Osage Valley Electric Cooperative members begin switching their thermostats from cooling to heating. For homes utilizing an all-electric air-source heat pump, this seasonal transition can sometimes bring an unwelcome surprise: a sudden, drastic spike in your monthly electric bill.

The primary culprit behind unexpected autumn heating bills is the unintentional triggering of auxiliary heat. While standard heat pump operation is remarkably efficient, backup resistance heating coils consume up to three to four times more electricity to produce the same amount of warmth.

A proactive preventive maintenance routine ensures your system delivers efficient heating all season long without unnecessarily triggering auxiliary heat.

Why Auxiliary Heat Might Trigger

Air-source heat pumps work by absorbing heat energy from the outdoor air and transferring it inside your home. However, when the outdoor temperature drops significantly, or if there is a wide gap between your home’s current temperature and your thermostat setting, the system relies on auxiliary electric heat strips to close the gap quickly.

Alternatively, if your heat pump has restricted airflow, low refrigerant levels, or a misconfigured thermostat, it may run constantly on auxiliary heat, causing your energy consumption to surge.

Fall Heat Pump Preventative Maintenance Checklist

1. Replace HVAC Air Filters

A dirty or clogged air filter restricts airflow across the indoor evaporator coil. Reduced airflow forces the heat pump to work harder and can cause the system to automatically engage backup electric heat strips to compensate.

• Inspect filters monthly during high-use heating months.
• Replace standard pleated filters every 30 to 90 days.

2. Clear the Outdoor Condenser Unit

Falling leaves, grass clippings, weeds, and seasonal debris can block the air intake of your outdoor unit.

• Maintain at least 2 feet of clear space around the entire outdoor unit.
• Gently clear away fallen leaves, pine needles, and dead vegetation.
• Never cover or enclose an operating heat pump outdoor unit during heating season.

3. Practice Cost-Saving Thermostat Habits

Cranking up your thermostat by 4 or 5 degrees all at once signals to your HVAC system that your home needs heat immediately. The system responds by turning on high-cost auxiliary heat coils.

• Keep your thermostat set to a steady, comfortable temperature.
• If adjusting the temperature, increase it gradually by no more than 1 to 2 degrees at a time to prevent auxiliary heat from kicking on.
• If using a programmable or smart thermostat, ensure it features heat pump-specific logic (such as "Aux Heat Optimization") that limits backup heat activation.

4. Inspect Ductwork and Air Vents

Leaky or uninsulated supply ducts in unconditioned crawlspaces or attics can lose up to 30% of warm air before it reaches your living spaces.

• Ensure all interior supply vents and return grilles remain fully open and unblocked by furniture or drapes.
• Inspect accessible ductwork for loose seals or disconnected joints.

5. Schedule Professional Annual Servicing

Having a licensed HVAC technician service your system each autumn ensures maximum efficiency. A professional pre-season checkup includes:
Checking refrigerant charge levels. (Low refrigerant forces backup heat usage.)

• Cleaning indoor and outdoor coils.
• Inspecting electrical connections, contactors, and blower motors.
• Verifying proper reversing valve and defrost cycle operation.

Stay Warm and Worry-Free This Fall

Osage Valley Electric Cooperative is committed to helping members lower energy costs. For more information on heating and cooling your home, please visit our website.