Everyone knows that February in Massachusetts is always tough. Your heat pump is keeping your house warm, but when you notice the ice forming on your outdoor unit or the warm air blowing from your vents, you start to worry.
Some frosts are totally normal. But when you notice that ice that refuses to melt? Well, it might be that there’s a problem somewhere.
We can help you understand what’s going on with your heat pump during this February freeze. With this guide, you’ll know when to call in the experts.
Why Is My Heat Pump Blowing Cold Air in February?
This is one of the issues we notice about North Attleboro homeowners. Here’s the heat pump defrost cycle explained for MA homeowners:
Heat pumps have an automatic defrost mode that deals with how ice forms. Your system automatically does these when sensors detect frost on the outdoor unit:
- Switches to cooling mode – it sends warm refrigerant outside to melt ice
- Shut off the outdoor fan to speed up melting
- Runs for 5–15 minutes, then returns to normal heating
During this defrost, you might notice:
- Steam rising from the outdoor unit (that’s ice melting, and it’s totally normal)
- Brief drop in indoor temperature
- Clicking sounds when the cycle starts and ends
Usually, normal frost looks like a light, even coating that disappears within 30 minutes.
To know one that could be a problem, you’d find a thick buildup covering the entire unit or ice accumulation for several hours. More specifically, it may also be that ice is forming on the copper refrigerant lines.
Does a Heat Pump Work in Freezing Weather?
Yes, there are heat pumps that can function in freezing weather, and even when it is -15°F outside, they can still heat your home efficiently.
Here is how they function: Heat pumps do not burn fuel; rather, they extract heat from the outside and transfer it indoors. Therefore, even when the weather is totally freezing, there is still heat energy present in the air. Modern heat pumps can still function properly even when the weather is freezing.
What Causes Heat Pump Freezing?
These are some of the causes that lead to your heat pump freezing during winter:
Restricted Airflow
Your heat pump requires proper airflow. And in February, snow drifts, ice dams, and debris can block airflow. All of these traps moisture, causing ice to form. Remove snow and debris around the outdoor unit of your heat pump and ensure that there is at least two feet of clearance on all sides.
Low Refrigerant Levels
Refrigerants usually absorb heat from the air outside, and if the level of the refrigerant is low, maybe due to a leak, the coil becomes too cold.
Some warning signs include:
- Ice on copper refrigerant lines
- Hissing or bubbling noises
- Inconsistent heating
This situation demands that you call professionals who are experts on this. Low refrigerant indicates that there is a leak that needs to be found and fixed.
Malfunctioning Defrost Cycle
Ice will keep building if the defrost cycle is not working properly. Your system may not melt the ice if any sensor, control board, or reversing valve malfunctions.
How to Improve Heat Pump Efficiency in Sub-Zero Temperatures
The following are simple means to improve heat pump efficiency in sub-zero temperatures:
Set It and Forget It
This is the most important thermostat tip for heat pump owners. Stop adjusting the temperature. We know it’s tempting to turn it down at night or when you leave the house. However, heat pumps are not furnaces. They function best when maintaining a constant temperature.
Usually, this is because turning the temperature down at night and up in the morning makes heat pumps really hard to catch up. What you don’t know is that you’re actually losing money by doing this compared to maintaining a constant temperature.
So here’s what you should do the rest of this February:
- Find a comfortable temperature, typically 68°F
- Leave it there all day and all night
- Switch to HEAT mode, not AUTO
- Use the AUTO fan setting
Change Your Filters Monthly
Dirty air filters will limit airflow, making your system work overtime and freeze. Check your filters monthly during the heating season. Change them whenever they get dirty.
Keep the Outdoor Unit Clear
After every snowfall, remove snow from your outdoor unit. Never pour hot water on a frozen unit. If you do, the temperature difference might damage your coils. Make sure the defrost cycle finishes, or call a professional.
Signs Your Heat Pump Needs A Professional Repair
Heat pumps require repair when you experience:
- Thick ice that won’t melt: If your outdoor unit is frozen solid for a long period without melting, there might be a problem.
- Your house doesn’t heat up: Your heat pump might be running continuously, and you’re still freezing. There might be ice buildup that’s preventing the flow of heat. Therefore, check your vents; it’s a problem if the airflow is weak or cold.
- Weird noises during operation: If you notice weird noises when your heat pump is operating, this is not normal. Ice accumulation may cause your fan and compressor to work extra hard, and eventually, your heat pump fails.
- Complete system shutdown: If your system shuts down completely, it could be a safety sensor issue triggered by excessive ice buildup. This requires immediate professional attention.
What Professional Repair Includes
When looking for heat pump repair near me or heat pump repair in Attleboro homes, contact Briggs Mechanical, as we make it simple to keep your heat pump running at its best. Briggs Mechanical offers routine maintenance, including cleaning or replacing filters, cleaning coils, and lubricating moving parts. These are important for making heat pumps more durable and more energy efficient.
Usually, we also recommend a yearly professional inspection. This typically includes:
- Servicing refrigerant levels
- System calibration
- Checking for any issues affecting your system’s performance.
Don’t Let a Frozen Heat Pump Ruin Your Winter
Your heat pump is designed for Massachusetts winters. Sometimes it just needs a little assistance. Whether you’re fighting ice buildup, having trouble staying warm, or concerned about increasing energy costs, Briggs Mechanical is here for you.
It’s important to choose the right heat pump system for your residential and business needs, and this is exactly our speciality. Whether you want your HVAC maintenance in North Attleboro or are exploring energy-efficient solutions for your business, we’re your heat pump experts. Contact Briggs Mechanical today.
Frequently Asked Questions
Does a heat pump work in freezing weather?
Yes. Today’s cold-weather heat pumps work for Massachusetts winters. They function well even below freezing.
Why is there ice on my heat pump in winter?
If there’s a thin layer of frost, it’s nothing to be concerned about. But if there’s a lot of ice, it may mean you have a problem with airflow, refrigerant, or your defrost cycle.
When should I call for professional heat pump repair?
If the ice is still there after 30 minutes or if your house isn’t heating up, it’s time to find a professional repair service like Briggs Mechanical. Other situations may be if you hear strange noises, if the system is short-cycling, or if you suspect a refrigerant issue.