Heat Pump Winter Maintenance: Keeping Your System Running in Cold Weather

How Heat Pumps Work in Winter

Unlike furnaces that generate heat by burning fuel, heat pumps transfer heat from the outdoor air into your home. Modern heat pumps can extract heat even when outdoor temperatures drop well below freezing, making them an efficient heating option for Pocono Mountains homes.

However, cold weather does put extra stress on your heat pump. Proper winter maintenance ensures your system runs efficiently and avoids costly breakdowns when you need heat the most.

Essential Winter Maintenance Tips

1. Keep the Outdoor Unit Clear

Snow, ice, and debris can block airflow to your outdoor unit. After snowstorms, gently brush snow away from the unit and maintain at least 18 inches of clearance on all sides. Never use sharp tools to chip ice off the unit, as this can damage the coils.

2. Understand Defrost Mode

It's normal for frost to form on your outdoor unit during cold weather. Your heat pump has a built-in defrost cycle that periodically reverses operation to melt ice buildup. During defrost mode, you may notice steam rising from the unit and hear the system switch over — this is completely normal.

When to be concerned: If the unit stays frosted over for more than a few hours, or if ice builds up thickly on the coils, call a professional. This could indicate a refrigerant issue, a faulty defrost control, or a malfunctioning reversing valve.

3. Don't Crank the Thermostat

Resist the urge to turn the thermostat way up when it's cold. Heat pumps work most efficiently when maintaining a steady temperature. Large temperature swings can trigger the auxiliary electric heat strips, which use significantly more energy.

Best practice: Set your thermostat to a comfortable temperature (68-70°F) and leave it there. Use a programmable thermostat to lower the temperature slightly at night or when you're away.

4. Check Your Emergency Heat

Most heat pump systems have a backup heating source (usually electric heat strips) for extremely cold days. Test your emergency heat setting early in the season to make sure it works. You don't want to discover a problem during a polar vortex.

5. Replace Filters More Frequently

During winter, your heat pump runs almost continuously. This means filters get dirty faster. Check your filter monthly and replace it when it looks dirty — typically every 30-60 days during heavy use.

6. Listen for Unusual Sounds

A well-maintained heat pump should run relatively quietly. Be alert for:

• Grinding or scraping: Could indicate a motor bearing issue
• Hissing or bubbling: May signal a refrigerant leak
• Loud banging: Possibly a loose component or compressor issue
• Constant running without reaching temperature: System may be undersized or have a problem

When Heat Pumps Need Help

In the Pocono Mountains, temperatures can drop below the efficient operating range of older heat pumps. If your system struggles to keep up on the coldest days, it may be time to consider:

• Upgrading to a cold-climate heat pump like a Mitsubishi Hyper-Heating system, which operates efficiently down to -13°F
• Adding supplemental heating for extreme cold snaps
• Scheduling a professional efficiency evaluation

Schedule Winter Maintenance

Don't wait for a breakdown. Call Jeff's HVAC at (610) 951-4441 to schedule a winter heat pump inspection. As a Mitsubishi Diamond Dealer, we specialize in high-efficiency heat pump systems built for Pocono Mountain winters. Financing options available.