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How to Prep Your HVAC System Before the Cold Hits

October 10, 2025

As the leaves change and cooler weather moves into the Upstate, now is the ideal time to prepare your home for winter. Performing fall HVAC maintenance helps avoid costly surprises when your system is working its hardest.

At Sanders Heating & Cooling, we’ve seen what happens when systems go unchecked—emergency calls, uncomfortable homes, and high utility bills. A little preparation now can save you time, money, and stress when cold weather arrives.

Why Fall Is the Best Time for HVAC Maintenance

Fall is considered the off-season for heating and cooling, which makes it the perfect time to get ahead of potential problems. Your air conditioner has done its job all summer. Your furnace or heat pump is about to take over. A professional system check ensures a smooth transition and reduces the risk of breakdowns during peak winter demand. Routine HVAC maintenance can:

  • Boost energy efficiency
  • Catch issues before they lead to expensive HVAC repair
  • Extend the lifespan of your system
  • Improve indoor air quality Keep your family safe and comfortable

Fall HVAC Maintenance Checklist

Here’ show to get your system ready for the colder months ahead.

Replace Your Air Filter

One of the simplest ways to support your HVAC system is by changing your air filter. A clogged filter restricts airflow, which makes your system work harder and reduces its lifespan. It can also circulate dust and allergens throughout your home. Replace filters every 30 to 90 days depending on your system, usage, and whether you have pets or allergies.

Adjust Your Thermostat for Fall

As outside temperatures drop, be sure to update your thermostat settings. If you’re using a programmable or smart thermostat, set schedules that reflect your fall routine—lowering the temperature at night or when you’re away can save on heating costs. Considering an upgrade? See how smart thermostats can improve comfort and efficiency.

Schedule a Professional Tune-Up

This is the most important step on the list. A fall tune-up from a certified technician ensures your system is clean, safe, and ready for peak performance. Our team at Sanders Heating & Cooling will inspect, test, and adjust your equipment, checking everything from burners and heat exchangers to electrical connections and airflow.

You can book your seasonal tune-up online in just a few clicks.

Signs You Might Need HVAC Repair

Routine maintenance can help prevent tissues, but your system may already be giving you subtle warning signs.

Keep an eye out for the following:

  • Uneven temperatures between rooms
  • Strange noises like banging, rattling, or squealing
  • Unusual odors coming from vents or the unit
  • Higher-than-normal energy bills
  • A system that runs constantly or cycles too often

If you’re noticing any of these, don’t wait for winter to make things worse. We recommend having a professional inspect your system now to avoid a major HVAC repair later.

Clear Your Vents and Unit Area

Walk through your home and check that nothing is blocking your air vents or returns. Move furniture or curtains if needed. Outside, clear away leaves and debris from around your heat pump or outdoor HVAC unit. Good airflow is essential to efficient performance.

Test Your Carbon Monoxide Detectors

If your home has a gas furnace, safety should always be a top priority. Test your carbon monoxide (CO) detectors and replace batteries if needed. If you don’t have detectors installed, consider adding them near bedrooms and living areas. For more on CO safety, visit the CDC’s carbon monoxide guide.

Make Maintenance Easy with a Priority One Membership

If keeping track of seasonal maintenance feels overwhelming, our Priority One Membership makes it simple.

Members receive:

  • Two seasonal tune-ups each year
  • Priority scheduling
  • Discounts on repairs and service calls
  • Peace of mind knowing your system is ready for any season

It’s our most convenient way to stay ahead of breakdowns and protect your comfort.

Ready to Get Started?

Whether you’re prepping early or already noticing issues, don’t wait for the first frost to schedule your HVAC maintenance. Sanders Heating & Cooling has served Greenville and the Upstate for over 70 years, and we’re here to help your family stay comfortable all season long.

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