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Understanding Heat Pumps: Why a 15–20°F Difference Is Normal

When temperatures climb outside, it’s natural to expect your home to feel perfectly cool inside. But if your thermostat is set to 70°F and your home lingers around 75°F on a 95°F day, that doesn’t necessarily mean your heat pump isn’t working. In fact, it may be working exactly as designed.

The Industry Standard: 15–20°F Difference

Heat pumps, like air conditioners, are designed to deliver a temperature drop of about 15–20°F between the air outside and the air inside. For example:

  • If it’s 95°F outside, your heat pump is typically able to bring your home to 75–80°F.
  • If it’s 85°F outside, your home can usually hold around 65–70°F.

This range is considered the industry standard for efficiency, comfort, and system longevity.

Why Your Thermostat May Not Hold Set Temperature

When extreme heat rolls in, your system may run continuously trying to keep up. Here’s why that’s not always a problem:

  • System Design – Heat pumps are sized for efficiency, not extremes. Oversizing leads to wasted energy and uneven comfort.
  • Heat Gain in the Home – Sunlight through windows, open doors, cooking, and other daily activities all add heat your system must battle.
  • Continuous Operation Is Normal – On hot days, it’s common for your system to run non-stop. This doesn’t mean it’s broken; it means it’s doing its best to maintain comfort within its design limits.

How to Help Your Heat Pump Work at Its Best

Even though your system is working properly, there are steps you can take to stay more comfortable:

  • Keep blinds or curtains closed during the hottest part of the day.
  • Seal gaps and insulate to reduce heat gain.
  • Use ceiling fans to improve air circulation.
  • Schedule regular maintenance to keep your system operating at peak performance.

Final Thoughts

If your home isn’t cooling as much as you’d like, it doesn’t always mean your heat pump is failing. Understanding the 15–20°F design standard helps set realistic expectations and ensures peace of mind during the hottest days of the year.

Need help keeping your system running smoothly? HeatGuy LLC is here for you — call us today at 360.253.4822 or visit www.heatguyllc.com to schedule service.

 

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