If you live in Clayton, NC or anywhere in the Triangle area, you know how unpredictable winter weather can be. One week we’re dealing with freezing temperatures and running our heat nonstop — and the next, it suddenly feels like spring.

But have you ever wondered what that sudden temperature swing does to your HVAC system?

At Parker and Company Heating and Air, we often receive service calls right after dramatic weather shifts. Here’s what’s happening behind the scenes in your heating and cooling system — and how to make sure it keeps running efficiently year-round.

1. Your HVAC System Has Been Working Overtime

During a freezing week, your heating system runs longer cycles to maintain indoor comfort. Whether you have a heat pump or furnace, the system is:

• Cycling more frequently

• Running extended heating cycles

• Working harder to offset heat loss

• Possibly operating in emergency heat mode (for heat pumps)

When temperatures suddenly warm up, your system finally gets a “break” — but that transition can expose underlying issues that developed during the cold stretch.

2. Expansion and Contraction of Components

Extreme cold followed by warmer temperatures causes metal components, ductwork, and refrigerant lines to expand and contract.

This can sometimes lead to:

• Loose electrical connections

• Small refrigerant leaks becoming noticeable

• Ductwork shifting and creating air gaps

• New rattling or vibration sounds

If you hear unusual noises after a weather change, it’s worth scheduling an HVAC inspection.

3. Heat Pumps Switching Modes

In North Carolina, heat pumps are extremely common. During freezing temperatures, your system may rely heavily on auxiliary or emergency heat.

When temperatures rise:

• The system switches back to standard heat pump mode

• Defrost cycles stop running as frequently

• Efficiency improves significantly

If your system struggles to switch modes or continues running auxiliary heat unnecessarily, your energy bills can spike.

4. Thermostat Adjustments Can Stress the System

When the weather warms up suddenly, many homeowners immediately lower their thermostat or even switch from heat to cooling mode.

Frequent drastic thermostat changes can:

• Cause short cycling

• Put stress on electrical components

• Confuse improperly programmed thermostats

It’s always best to make gradual adjustments and ensure your thermostat is calibrated correctly.

5. Airflow Issues Become More Noticeable

After a heavy heating period, clogged filters and airflow restrictions often become apparent.

Signs include:

• Uneven temperatures between rooms

• Weak airflow

• System running longer than normal

• Higher energy bills

Replacing your air filter after a cold spell is one of the simplest ways to protect your HVAC system.

6. Condensation and Moisture Changes

When outdoor temperatures rise quickly, humidity levels can shift. This can create:

• Extra condensation on coils

• Increased moisture in ductwork

• Musty smells when switching modes

If you notice unusual odors when transitioning from heating to cooling, it may be time for a professional system check.

7. Why Preventative Maintenance Matters in Clayton, NC

Sudden temperature swings are common in Clayton and throughout the Triangle area. That’s why seasonal HVAC maintenance is so important.

A professional maintenance visit from Parker and Company Heating and Air includes:

• Electrical component inspection

• Refrigerant level checks

• Thermostat calibration

• Airflow testing

• Coil and system cleaning

• Safety checks

Preventative maintenance ensures your system transitions smoothly between freezing winter weather and milder temperatures.

When Should You Call for Service?

After a sudden warm-up, contact a professional if you notice:

• Your system won’t switch modes properly

• Strange noises

• Rising energy bills

• Weak airflow

• Uneven heating

• A system that won’t shut off

Catching small issues early prevents expensive breakdowns later.

Trust Parker and Company Heating and Air in Clayton, NC

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