By Peter, Master Electrician | PRO Electric plus HVAC | Heating Systems
Falls Church Heat Pump Defrost Cycle | Protect Your System in Freezing Weather
Hi, I’m Peter, an HVAC Technician with PRO Electric plus HVAC.
If you live in Falls Church, you know how quickly Virginia’s weather can shift from mild to freezing.
For homeowners with heat pumps, one of the most important but often overlooked parts of the system is the defrost cycle.
This feature is what keeps your outdoor unit from icing up during cold weather.
Why the Defrost Cycle Matters
When temperatures drop, frost naturally forms on the outdoor coil of your heat pump.
A little frost is normal, but too much ice can block airflow, reduce efficiency, and strain the system.
That’s when the defrost cycle kicks in.
It temporarily reverses operation, melting the ice and letting your heat pump breathe again.
Without this function, your system can lose heating power or even break down.
Problems I See in Falls Church Homes
I’ve serviced many heat pumps in Falls Church, and some common issues with the defrost cycle include:
- Faulty sensors that fail to detect ice buildup
- Timer problems that don’t allow enough time for ice removal
- Low refrigerant levels that prevent proper heat transfer
- Blocked outdoor units covered with leaves or snow, making defrost harder
If the defrost cycle isn’t working right, your system has to work harder, which means higher bills and less comfort.
What I Check During a HVAC Service Call
When I inspect a heat pump’s defrost cycle, I:
- Test the temperature sensors to ensure they trigger at the right time
- Check the reversing valve to make sure it shifts smoothly
- Confirm the outdoor fan shuts off correctly during the cycle
- Inspect refrigerant levels and airflow around the outdoor unit
- Verify the system switches back to heating mode without delays
What You Can Do as a Homeowner
There are a few simple steps you can take between service visits:
- Keep the outdoor unit clear of snow, ice, and leaves
- Replace your air filters regularly to maintain airflow
- Watch for signs of trouble, such as the outdoor unit staying frozen or making loud noises during defrost
Falls Church Weather and Heat Pumps
Falls Church winters may not be as harsh as up north, but sudden cold snaps and freezing rain make defrost cycles especially important.
A unit that can’t clear frost quickly is at risk of losing efficiency just when you need heat the most.
Final Thought
Your heat pump’s defrost cycle is like a built-in safety net. It keeps your system reliable, efficient, and ready to handle freezing temperatures.
Having it checked each year is a simple step that protects both your comfort and your wallet.
If you live in Falls Church and want peace of mind before winter hits, call me at PRO Electric plus HVAC.
I’ll make sure your defrost cycle is working exactly as it should so your family stays warm all season long.
📞 Call 703-225-822 now or book online while you’re thinking about it.
