The theory underlying modern heat pumps was first described by Lord Kelvin in 1852. Luckily, Yardley, PA residents don’t have to be royal physicists to get a handle on heat pump problems. While it can sometimes be tricky to tell in the winter if your heat pump is blowing cold air while in heating mode, there could be an underlying problem that requires HVAC expertise.
Is Your Mind Playing Tricks on You?
It may surprise you to discover that it’s not uncommon for the air coming from a heat pump to feel cool relative to other kinds of heating systems. Unlike furnaces, which blast out noticeable hot hair after burning fuel, heat pumps generate warmth in a subtler way. Typically, a heat pump will blow air that’s between 85 and 90 degrees. While this is certainly warmer than the average indoor temperature—say, a thermostat set at 68 degrees— it’s still cooler than your body temperature (about 98.6 degrees). That’s why the air can feel lukewarm or even slightly cool when you place your hand in front of the vent, even though the system is working as intended.
So, before you panic about chilly breezes, remember: what feels cool to your skin may actually be just right for your home’s comfort and efficiency. If you’re just noticing this now but are living comfortably with your heating system, there probably isn’t anything wrong.
However, if you’ve been shivering since October or November, it’s time to check things out. You can use an infrared thermometer on the heat pump vents to know for sure. Additionally, if your home thermostat is not rising when the heat’s on, then there’s likely an issue that needs professional attention.
Normal Operation: The Defrost Cycle Explained
But what if you feel a definite chill coming from your vents, and it only lasts for a few minutes at a time? Welcome to the wonders of your heat pump’s defrost mode.
Heat pumps, much like their relative the air conditioner, work by shuttling heat from one place to another using a cycle of compression and expansion. When Yardley faces those frosty mornings, moisture can freeze on the outdoor coil. To keep everything running smoothly, your heat pump briefly switched into what’s called “defrost mode.” During this cycle, the system essentially works in reverse, moving hot refrigerant outside to melt away ice.
Here’s the key: while it’s in defrost mode, the air blowing inside may feel chilly or even cool—this is totally normal. The defrost cycle is designed to protect your equipment and only lasts a few minutes. Once it’s over, your heat pump will snap back to heating as usual.
So, if you catch a sudden gust of cold air when it’s below freezing outside, don’t sweat it. Give the system a moment to finish its frosty self-care routine before adjusting any settings or calling in the cavalry.
Quick Fixes
Sometimes dirty air filters can cause your unit to put out cold air. Turn your unit off and replace your filters if they’re dirty.
Another easy-to-fix problem involves your thermostat settings. Depending on your unit, you may have to turn your settings to “AUTO” instead of “ON.”
When in “ON” mode, the unit’s fan stays on even when no heat is being produced. This can cause cold-feeling air to come out of your vents.
Repairs or Maintenance Service Needed
If none of the above seems to be the problem, it’s time for a service call. When your heat pump is blowing cold air in heating mode, it could be a failing reversing valve or a number of other issues. Luckily for Yardley, PA, residents, and anyone in our greater service area, we’ve got the expertise to quickly diagnose and repair most heat pump issues.
We’re Here to Serve Yardley, PA and the Surrounding Areas
If there’s an issue with your heat pump, Service First Heating & Air Conditioning offers expert heat pump repair and replacement services. We’re easy to contact, quick to get to work, and straightforward with our pricing.
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