7 Important Things to Check Before Using Your Heater This Fall

October in North Texas often feels like a tug-of-war between summer and fall. One afternoon may still be warm enough for the AC, while the next morning can feel cool enough to turn on the heat. That sudden change is usually when homeowners start thinking about the heating side of their HVAC system again.

Before switching modes, it makes sense to give the system a quick review. In many homes, the furnace or heat pump may not have been used since March or April. Over that time, dust can settle on burners or heat strips, thermostat and alarm batteries can weaken, and stored items may end up too close to the furnace.

Catching these issues in October gives homeowners a chance to solve them before the weather becomes truly cold. A minor problem is much easier to handle during a mild day than during a December cold snap.

Lewisville homeowners should also pay attention to the timing. Average daytime highs generally move from the mid 80s early in October toward the low 70s by the end of the month. The chance of the first frost also starts to rise during the final days of October.

TexAire Heating & Air Conditioning regularly helps homeowners in Lewisville prepare furnaces and heat pumps for this seasonal change. The checklist below covers what can be checked safely at home and what should be left to a qualified HVAC technician.

The aim is to make sure the heating system is ready, efficient, and safe before colder weather arrives.

Why October Is the Right Time to Run Through This Checklist

October is one of the best times to test the heating system because homeowners still have time to act if something is wrong.

If a furnace does not start on a mild afternoon, the home is still comfortable enough to wait for service. If the same failure happens on a freezing January night, the problem can become urgent very quickly.

Testing early can also make scheduling easier. HVAC companies usually receive more heating calls after the first major cold front.

Lewisville weather adds another reason to prepare in advance.

Temperatures can change significantly between morning and afternoon. A household may need heat early in the day and air conditioning again later.

That repeated switching can place extra demand on thermostats, heat pumps, and system controls.

A seasonal check helps confirm that the system is ready for those changing conditions.

10 Things to Check Before Switching From AC to Heat

1. Replace the Air Filter

The HVAC filter may have been working for months during the cooling season.

While the AC runs, the filter traps dust, pollen, pet hair, and other airborne debris.

By October, it may be noticeably dirty or clogged.

A dirty filter restricts airflow.

When less air can move through the system, the furnace or heat pump has to work harder to heat the home.

In gas furnaces, restricted airflow can also cause the heat exchanger to become hotter than intended.

If temperatures rise too much, the furnace may shut down through its built-in safety controls.

Replacing the filter with the correct size before heating season begins is one of the easiest ways to protect the HVAC system.

Most standard 1-inch filters should be replaced every 1 to 3 months.

Thicker media filters usually last longer, but they should still be checked regularly.

2. Confirm Thermostat Settings and Batteries

Before assuming there is a heating-system problem, check the thermostat.

Many "no heat" situations in fall are related to settings or weak batteries rather than a major equipment failure.

Change the thermostat mode from Cool to Heat.

Raise the temperature setting a few degrees above the current room temperature.

Then give the system several minutes to respond.

If the thermostat screen is blank or dim, replace the batteries first.

Smart thermostats need an extra look as well.

Summer schedules, eco settings, away modes, and vacation programs may still be active.

Those settings can delay heating or limit the indoor temperature.

Homes with heat pumps should also confirm that the thermostat is configured correctly for heat pump operation.

An incorrect setup may cause auxiliary electric heat to run more often than needed.

Auto mode can also lead to frequent switching in October.

Because mornings and afternoons may feel very different, many homeowners prefer manually choosing Heat or Cool until temperatures become more consistent.

3. Test Smoke and Carbon Monoxide Alarms

Carbon monoxide cannot be seen or smelled.

That makes working alarms essential in homes with gas furnaces, gas water heaters, or attached garages.

Test each carbon monoxide alarm before heating season begins.

Replace weak batteries and make sure alarms near sleeping areas and on every level of the home are functioning properly.

The age of the detector matters too.

Many carbon monoxide alarms have a service life of roughly 5 to 7 years.

The manufacture date is generally printed on the back.

If a carbon monoxide alarm sounds, everyone should leave the home immediately.

Call 911 from outside once everyone is safely away from the property.

4. Clear the Area Around the Furnace

The area around a furnace can gradually become a storage space.

In Lewisville homes, furnaces are often installed in garages, hallway closets, or attics.

Boxes, cleaning supplies, paint cans, holiday decorations, and other belongings can end up too close to the equipment.

Combustible items should not be stored near a gas furnace.

They can increase fire risk, while fumes from certain chemicals may interfere with proper combustion.

The furnace also needs open space for airflow and service access.

Remove anything stored directly against the unit and maintain several feet of clearance whenever possible.

If the furnace is located in an attic, make sure the walkway to the unit is clear as well.

That gives technicians safer access if maintenance or repair becomes necessary.

5. Open and Clear Supply Vents and Return Grilles

Blocked vents can create heating problems that are easy to overlook.

Furniture may have been moved in front of a return grille.

A rug may be covering a floor vent.

Some supply registers may have been closed during the cooling season.

Warm air needs an open path into each room.

Return grilles also need enough space to pull air back toward the HVAC system.

When returns are blocked, some rooms may stay colder than others.

Walk through the house and check each supply register and return grille.

Open closed vents and remove anything that interferes with airflow.

Vacuuming dust from vent covers can also help reduce the dusty smell that often appears during the first heating cycle.

6. Inspect the Outdoor Heat Pump Unit

Heat pumps need attention outside the home as well.

Unlike a traditional gas furnace, a heat pump uses the outdoor unit during both cooling and heating.

That means the condenser remains important throughout the winter.

Leaves, grass clippings, weeds, and overgrown shrubs can restrict airflow around the unit.

Keep around 2 feet of clearance around the equipment.

Carefully remove visible debris from the top and sides.

On colder mornings, the system may activate its auxiliary heat strips.

A brief burning-dust smell can occur when these strips operate after months of inactivity.

Frost may also appear on the outdoor coil during cold and damp weather.

A light coating is normally not a problem if the defrost cycle removes it.

If the unit becomes heavily covered in ice and does not clear itself, it should be professionally inspected.

7. Check the Gas Supply and Furnace Ignition

A gas furnace needs a steady fuel supply and a properly working ignition system.

Homeowners can safely perform a few basic checks.

Make sure the gas valve serving the furnace is open.

Also confirm that the furnace power switch is turned on.

This switch often looks like a standard light switch and is usually located near the equipment.

Older furnaces with a standing pilot light should normally show a steady blue flame.

Anything beyond these basic checks should be handled by a professional.

A rotten-egg or sulfur-like smell is never normal.

If that odor is present, leave the home immediately.

Once everyone is safely outside, contact the gas utility or call 911.

Do not light matches, operate electrical switches, or attempt to locate the source of the leak yourself.

8. Run a Test Cycle on a Mild Day

The first cold night of the year should not be the first time the heating system is tested.

Choose a mild October day and run the system for approximately 15 to 20 minutes.

Watch how it operates.

The system should start normally, warm air should reach the vents, and the equipment should shut off once the thermostat reaches the set temperature.

Testing early gives homeowners time to schedule service without losing indoor comfort.

A faint burning-dust smell during the first heating cycle is often normal.

Dust may have settled on the heat exchanger or electric heat strips while the system was not being used.

When those components warm up, the dust burns away.

The smell should generally fade within the first hour.

If the odor resembles melting plastic, hot electrical wiring, or continues for several hours, shut the system off and contact a qualified HVAC technician.

9. Listen for Unusual Sounds and Watch the Airflow

Some heating-system sounds are normal.

A click at startup, the soft sound of burners igniting, and the steady hum of the blower are all expected.

Unusual noises should not be ignored.

Loud banging, grinding, squealing, or repeated clicking without successful ignition can indicate a mechanical or ignition-related issue.

These problems usually become worse with continued use.

Airflow can also provide important clues.

Weak air from the vents, rooms that remain much colder than others, or a system that repeatedly turns on and off every few minutes may point to a blower issue, duct problem, or failing component.

Make note of where the problem happens and when it occurs.

That information can help a technician diagnose the system more quickly.

10. Schedule a Professional Heating Inspection

Homeowner checks are useful, but some important heating components are hidden behind access panels.

A professional inspection allows those parts to be checked safely.

The technician may inspect the heat exchanger for cracks, clean the flame sensor, examine the burners, test electrical connections and safety controls, and measure temperature rise across the system.

Heat pumps require additional inspection points.

These may include refrigerant performance, the reversing valve, defrost controls, and auxiliary heat strips.

Older gas furnaces deserve particular attention.

A cracked heat exchanger can allow combustion gases to enter the home's air supply.

TexAire Heating & Air Conditioning performs furnace and heat pump tune-ups throughout Lewisville that include inspection of important safety components before heating season.

Scheduling service in October gives homeowners enough time to complete needed repairs before the first hard freeze.

Why Lewisville Residents Choose TexAire Heating & Air Conditioning

TexAire Heating & Air Conditioning is a family-owned HVAC company based on Briarcliff Road in Lewisville.

TexAire Heating & Air Conditioning provides furnace repair, heat pump service, air conditioning repair, system installations, and seasonal tune-ups for homes throughout the city.

Technicians service major equipment brands, including:

· Carrier
· Trane
· Lennox
· Goodman
· Rheem.

TexAire Heating & Air Conditioning focuses on finding the root cause of a heating or cooling problem and explaining findings clearly before any work begins.

Several things make TexAire Heating & Air Conditioning a practical choice for homeowners preparing for heating season:

· Experienced, licensed HVAC technicians who work on both furnaces and heat pumps
· Seasonal tune-ups that prepare the system for the switch from cooling to heating
· Safety-focused inspections of heat exchangers, burners, electrical controls, and other key components
· Clear repair explanations so homeowners know what needs attention before work begins
· Heating service for gas furnaces and all-electric heat pumps, depending on the home’s system

Many homeowners research local contractors before booking a visit.

Lewisville residents often read customer feedback on the TexAire Heating & Air Conditioning page on Yelp  and review the company's Better Business Bureau profile  to learn about past service experiences.

TexAire Heating & Air Conditioning also shares seasonal maintenance reminders and service updates on its Facebook page.

Local Heating and Cooling Service Across Lewisville

TexAire Heating & Air Conditioning serves homes and businesses throughout Lewisville.

The service area includes established neighborhoods around Old Town as well as newer master-planned communities on the east side of the city.

Homes across Lewisville vary considerably in age.

Some were built during the 1970s and 1980s, while others are part of newer construction.

That variety means technicians work with many different furnaces, heat pumps, ductwork layouts, thermostats, and HVAC configurations.

· Old Town Lewisville: TexAire Heating & Air Conditioning provides furnace inspections and heating repairs for older homes and storefronts around Main Street and Wayne Ferguson Plaza.

· Valley Ridge: Homes near Valley Ridge Boulevard and the Valley Ridge Greenbelt receive heat pump tune-ups and thermostat upgrades from TexAire Heating & Air Conditioning.

· Castle Hills: TexAire Heating & Air Conditioning supports larger multi-zone homes throughout Castle Hills with seasonal maintenance and heating system diagnostics.

· Vista Ridge: Residents near FM 3040 and the Vista Ridge shopping corridor rely on TexAire Heating & Air Conditioning for furnace repair and air conditioning service.

· Lewisville Valley: TexAire Heating & Air Conditioning handles heating and cooling replacements for established homes across the Lewisville Valley neighborhood.

· Indian Oaks: Families in Indian Oaks receive carbon monoxide safety checks and furnace tune-ups from TexAire Heating & Air Conditioning.

· Meadow Lake: Lakeside homes in Meadow Lake receive heat pump service and indoor air quality solutions from TexAire Heating & Air Conditioning.

· Briarhill Estates: TexAire Heating & Air Conditioning provides heating inspections and ductwork evaluations for homes throughout Briarhill Estates.

· Lake Park and Lewisville Lake: Properties near Lake Park Road and the Lewisville Lake shoreline receive year-round HVAC repair and maintenance from TexAire Heating & Air Conditioning.

Driving Directions to Reach TexAire Heating & Air Conditioning

TexAire Heating & Air Conditioning operates from 2018 Briarcliff Road on the south side of Lewisville, a short drive from Interstate 35E and the city's main east-west roads. 

The routes below show how to reach the TexAire Heating & Air Conditioning location from other well-known points around Lewisville.

Driving directions from Southern Comfort Mechanical Air Conditioning,

Heating & Plumbing to TexAire Heating & Air Conditioning

• Start at Southern Comfort Mechanical Air Conditioning, Heating & Plumbing on Lake Park Road in north Lewisville, TX.

• Head south from the Lewisville Lake area toward Interstate 35E using Lake Park Road and connecting local streets.

• Continue south on Interstate 35E through central Lewisville toward the south side of the city.

• Follow local roads to Briarcliff Road, where TexAire Heating & Air Conditioning provides furnace repair and heating tune-up services.

Driving directions from Koala-T Heating & Air to TexAire Heating & Air Conditioning

• Start at Koala-T Heating & Air on State Highway 121 in southeast Lewisville, TX.

• Drive northwest toward Interstate 35E using State Highway 121 and its connecting ramps.

• Continue north on Interstate 35E for a short stretch into south Lewisville.

• Turn onto local streets toward Briarcliff Road, where TexAire Heating & Air Conditioning offers heat pump service and HVAC maintenance.

Driving directions from Integrated Mechanical and Electric Services, LLC to TexAire Heating & Air Conditioning

• Start at Integrated Mechanical and Electric Services, LLC on East College Street near Old Town Lewisville, TX.

• Travel west from the Old Town area toward Interstate 35E using College Street and nearby connecting roads.

• Head south on Interstate 35E toward the southern part of Lewisville.

• Continue to Briarcliff Road, where TexAire Heating & Air Conditioning provides air conditioning repair and heating system inspections.

Wrapping Up;

Switching from AC to heat in October is a useful reminder to check whether the heating system is ready for the colder months ahead.

A few simple steps can prevent many of the common problems that lead to fall heating service calls.

Replace a dirty air filter.

Check thermostat settings and batteries.

Test carbon monoxide alarms.

Make sure vents and return grilles are open and unobstructed.

Then run the heating system through a full test cycle while outdoor temperatures are still mild.

These basic checks can uncover problems before they become urgent.

Certain warning signs require more caution.

A burning odor that does not fade, a gas smell, unusual noises, or weak airflow may indicate that the system should not continue operating.

If any of these signs appear, keep the heating system off until it has been inspected by a professional.

With Lewisville's first frost risk increasing in late October and November, addressing these items early can make the transition into winter easier.

TexAire Heating & Air Conditioning helps Lewisville homeowners prepare furnaces and heat pumps for winter through seasonal tune-ups, safety inspections, and heating repairs.

Homeowners who want to learn more about the business before scheduling service can view the TexAire Heating & Air Conditioning member listing with the Prosper Chamber of Commerce  and the  TexAire Heating & Air Conditioning business profile on Wheree, where service details and customer information are available.

FAQs

When should I switch from AC to heat in Lewisville, TX?

Many Lewisville homeowners begin using heat in late October or early November when overnight temperatures regularly drop into the 50s or below.

Warm afternoons can still occur throughout October.

That means some households may use heat early in the day and air conditioning again later.

Testing the heating system before the first major cold front gives homeowners time to deal with problems before reliable heat becomes essential.

Is it normal for my heater to smell like burning the first time I turn it on?

A light dusty or burning odor during the first heating cycle can be normal.

Dust may have settled on the heat exchanger or electric heat strips while the system was inactive.

When those components warm up, the dust burns away and can create a temporary smell.

The odor should normally fade within about an hour.

If it continues, smells like melting plastic or electrical wiring, or resembles rotten eggs, turn the heating system off and seek professional help.

How often should I change my air filter during the heating season in Lewisville?

Most standard 1-inch filters should be replaced every 1 to 3 months.

The exact timing depends on pets, household size, indoor dust levels, and how often the HVAC system runs.

Lewisville homes that use both heating and cooling during fall may need to inspect filters more frequently.

Thicker media filters generally last longer but still require regular checks.

Should I leave my thermostat on Auto during October in Lewisville?

Auto mode allows the HVAC system to switch between heating and cooling automatically.

During October, that can cause frequent mode changes because mornings may be cool while afternoons become much warmer.

Many homeowners prefer manually selecting Heat or Cool until outdoor temperatures become more stable.

Smart thermostats with a wider gap between heating and cooling settings can also reduce unnecessary switching.

Does a heat pump need different checks than a gas furnace?

Yes.

A heat pump continues using the outdoor unit during heating season, so leaves, grass clippings, weeds, and other debris should be kept away from the condenser.

The thermostat should also be configured correctly for heat pump operation so auxiliary heat strips do not run more often than necessary.

Gas furnaces require different safety checks, including working carbon monoxide alarms and professional inspection of the burners and heat exchanger.

What should I do if my carbon monoxide alarm goes off after turning on the heat?

Everyone should leave the home immediately and call 911 from outside.

Do not continue operating the heating system until a qualified technician has inspected the furnace, flue, and heat exchanger.

Possible causes can include a blocked flue or cracked heat exchanger, and these conditions require professional attention before the system is used again.

When should I call an HVAC technician before switching to heat in Lewisville?

A professional inspection is worth considering if the system has not been serviced within the past year, the furnace is more than 10 to 15 years old, or the first heating test reveals unusual smells, strange noises, poor airflow, or inconsistent operation.

TexAire Heating & Air Conditioning provides furnace and heat pump tune-ups throughout Lewisville that include checking important safety components before winter.

Scheduling service in October gives homeowners more time to complete repairs before demand increases after the first hard freeze.