Heat Pump Efficiency: Best Settings for Arizona Winters

Arizona winters may be relatively mild, but January often brings 30-degree temperature swings between cool desert mornings and warm afternoons. For homeowners with heat pumps, those swings can affect comfort, efficiency, and monthly energy bills. The good news is that a few smart adjustments can significantly improve heat pump efficiency homeowners depend on during winter.

This guide breaks down five expert tips from our team at Forbes Refrigeration & Air Conditioning, including the best thermostat settings for the Sonoran climate, how to avoid costly heat strip activation, and how to tell whether your system is running a normal defrost cycle or showing signs of trouble.

Why Heat Pumps Work Well in Arizona

Heat pumps are a natural fit for Arizona’s Sonoran region. Instead of creating heat, they move heat from the outdoor air into your home. Even when overnight temperatures dip into the 30s or 40s, there’s still enough ambient heat for the system to operate efficiently.

Because our winters are short and generally mild, heat pumps rarely struggle to maintain a comfortable temperature when they’re properly set up and maintained. Most efficiency issues come down to thermostat habits, system settings, or misunderstandings about how heat pumps behave during winter.

How to Maximize Your Heat Pump Efficiency During the Winter Months: 5 Expert Tips

Maximizing winter efficiency is less about major upgrades and more about how your system is set and maintained day to day. For homeowners, a few intentional adjustments can prevent unnecessary energy use while keeping indoor comfort consistent despite major temperature swings.

1. Use the Right HVAC Winter Settings for Your Home

Heat pumps work best when they maintain steady indoor temperatures. Treating them like a gas furnace by turning them down at night and cranking them up in the morning often leads to inefficiency.

For most homes in the Scottsdale and Phoenix area, an ideal winter set point falls between 68 and 70 degrees. This range balances comfort with efficiency and reduces strain on the system. It also helps prevent backup heating from kicking on when the system tries to recover too quickly. For best results, let your heat pump run consistently instead of cycling it on and off. This allows it to respond smoothly to outdoor temperature changes throughout the day.

2. Avoid Unnecessary Heat Strip Activation

Heat strips, also called auxiliary or emergency heat, are electric resistance heaters built into many heat pump systems. They’re designed as a backup, not a primary heat source.

Heat strips are rarely needed in much of Arizona. Still, they often activate unintentionally due to thermostat usage or system issues. When they do, energy use (and electric bills) climbs fast.

To avoid unnecessary heat strip activation, keep your thermostat at a consistent temperature and avoid large temperature changes overnight or while away. If you do want to warm things up, increase the temperature gradually, ideally by one or two degrees at a time. Finally, make sure your thermostat is properly configured for heat pump operation.

3. Seal Air Leaks to Keep Warm Air Inside

Even an efficient heat pump can struggle if warm air keeps escaping your home. Air leaks around doors, windows, and ductwork allow heated air to slip out while cold air sneaks in.

Sealing leaks with weatherstripping, caulking, or duct sealing helps your system maintain temperature with less effort. These improvements reduce runtime, improve comfort, and support lower heating bills without changing your equipment.

4. Monitor Defrost Cycles and Know What’s Normal

Defrost cycles often worry homeowners, especially when they notice steam rising from the outdoor unit or feel cooler air inside for a short time. In most cases, that behavior is completely normal.

During defrost, the system briefly reverses operation to melt frost on the outdoor coil. That process keeps your heat pump operating efficiently. Here are a few characteristics of a normal defrost cycle:

• Happens occasionally on cool mornings
• Produces visible steam from the outdoor unit
• Lasts just a few minutes
• Ends on its own

If defrost cycles happen frequently, last too long, or leave ice behind, that may point to a problem. Loud noises, extended cold airflow indoors, or persistent ice buildup are signs it’s time for a closer look.

5. Schedule Routine Heat Pump Service

Routine service plays a major role in winter efficiency. During a professional tune-up, your technician checks refrigerant levels, cleans coils, inspects electrical components, and confirms sensors and controls are working as intended.

These small adjustments help your heat pump run more efficiently, reduce wear, and prevent issues like frequent auxiliary heat use. Regular service also gives you peace of mind that your system is ready to handle colder mornings without surprises.

When to Call a Professional to Assess Your Heat Pump

If your heat pump struggles to maintain temperature, relies heavily on auxiliary heat, or shows signs of frequent defrost issues, professional service is the next step. These symptoms often trace back to airflow problems, sensor issues, or control settings that need adjustment.

Make the Most of Your Heat Pump This Winter

Arizona’s winter weather creates ideal conditions for efficient heat pump operation when your system is set up correctly. With steady thermostat settings, routine maintenance, and a clear understanding of normal system behavior, you can enjoy reliable comfort without inflated energy bills.

At Forbes Refrigeration & Air Conditioning, we help homeowners fine-tune heat pump performance in and around Scottsdale and Phoenix, keeping systems efficient without driving up energy costs. If you want to make sure your heat pump is running at its best this winter, contact us today to schedule service.