When temperatures drop in Central Indiana, it’s common for homeowners to step outside and notice ice or frost on their HVAC system. This can be alarming — especially if your heat is running nonstop. The good news is that not all ice is a problem. The key is knowing what’s normal and when it’s time to call a professional.
When Ice on Your HVAC System Is Normal
If your home uses a heat pump, light frost on the outdoor unit during cold weather is expected. Heat pumps pull warmth from the outside air, and when moisture freezes on the coils, frost can form.
Your system is designed to handle this through a defrost cycle, which periodically melts the frost so the unit can continue running efficiently. During this cycle, you may notice:
- Steam rising from the unit
- The fan temporarily stopping
- A brief pause in heating
All of this is completely normal.
When Ice Is a Warning Sign
Ice becomes a concern when it builds up thickly or doesn’t go away. This can signal airflow or mechanical issues that reduce efficiency and strain your system.
Common causes include:
- Dirty or clogged air filters
- Blocked outdoor units (snow, leaves, debris)
- Low refrigerant levels
- Faulty defrost controls
If ice completely encases the unit or keeps returning quickly after melting, it’s time to have it checked.
What Homeowners Should Do (and Not Do)
Do:
- Replace air filters regularly during winter
- Keep at least 2 feet of clearance around the outdoor unit
- Gently clear snow from around the unit after storms
Don’t:
- Chip ice off with tools
- Pour hot water on frozen components
- Turn the system off for extended periods in freezing weather
These actions can cause damage and lead to expensive repairs.
When to Call a Professional
If ice buildup is persistent, your home isn’t staying warm, or your energy bills suddenly spike, a professional inspection can prevent further damage and keep your system running safely through winter.
At Absolute Comfort, we help Central Indiana homeowners stay warm and worry-free all season long.