Gas furnaces are one of the most common heating systems in homes throughout Central Ohio. Long winters, frequent temperature swings, and older housing stock in areas like Columbus, Delaware, Westerville, Galena, and Sunbury mean many furnaces work hard for several months each year.

When properly maintained, gas furnaces provide reliable and efficient heat. However, poor maintenance, aging equipment, or heat loss in the home can lead to higher utility bills and potential safety concerns. Because gas furnaces rely on combustion, proper operation and maintenance are important for both efficiency and safety.

Below are practical ways homeowners in Central Ohio can improve gas furnace efficiency while keeping their heating systems operating safely.

Replace or Clean Furnace Filters Regularly

One of the most common efficiency problems found during home inspections is a clogged furnace filter.

A dirty filter restricts airflow through the system. This forces the blower motor and furnace to work harder and run longer heating cycles, which increases energy usage and wear on the equipment.

During the winter heating season in Ohio, filters should generally be replaced every 1 to 3 months, depending on the type of filter and household conditions such as pets or dust levels.

Understand Furnace Efficiency Ratings (AFUE)

Gas furnace efficiency is measured using Annual Fuel Utilization Efficiency (AFUE). This rating indicates how much of the fuel used by the furnace is converted into usable heat.

For example:

• 80% AFUE furnace: 80% of fuel becomes heat, 20% is lost through exhaust gases

• 95% AFUE furnace: 95% of fuel becomes heat, only 5% is lost

Many older homes in Central Ohio still have furnaces installed in the early 2000s or earlier, which often have AFUE ratings near 70–80%. Newer high-efficiency furnaces can reach 90–98% AFUE, which can significantly reduce heating costs over time.

Seal Air Leaks Common in Ohio Homes

Many homes in Central Ohio lose heat through air leakage. Even a high-efficiency furnace cannot keep up if warm air is constantly escaping.

Common air leakage locations include:

• Attic access panels

• Rim joists in basements

• Gaps around windows and doors

• Plumbing or electrical penetrations

• Recessed lighting fixtures in ceilings

Sealing these leaks with caulk, foam, or weatherstripping helps retain heat inside the home and reduces the amount of time the furnace needs to run.

Improve Attic Insulation

Because warm air rises, poor attic insulation is a major contributor to heat loss during Ohio winters.

The U.S. Department of Energy recommends attic insulation levels around R-49 to R-60 in colder climates like Ohio. Many older homes have significantly less insulation than this.

Increasing attic insulation can make a noticeable difference in heating costs and overall comfort.

Use a Programmable or Smart Thermostat

Smart thermostats and programmable thermostats can reduce heating costs by automatically adjusting temperatures when the home is unoccupied or during sleeping hours.

Even lowering the thermostat 3 to 5 degrees overnight or while away can reduce furnace run time and improve energy efficiency during the winter months.

Keep Supply and Return Vents Clear

Blocked vents are another common issue seen during home inspections.

Furniture, rugs, or curtains placed over vents restrict airflow and prevent warm air from circulating properly throughout the home. This can create cold spots and cause the furnace to run longer cycles.

Make sure supply and return vents remain open and unobstructed.

Schedule Professional Furnace Maintenance

Routine HVAC maintenance is important for both efficiency and safety. An HVAC technician can inspect key components such as:

• Burners

• Heat exchanger

• Gas connections

• Electrical controls

• Blower motor

• Venting systems

Annual service helps ensure the furnace is burning fuel properly and operating efficiently before the coldest part of the winter season.

Ensure Proper Furnace Venting

Gas furnaces produce combustion gases that must be safely vented outside the home.

During inspections, it is not uncommon to find issues such as:

• Improperly installed vent connectors

• Corrosion or damage to flue pipes

• Blocked exterior exhaust vents

• Loose vent connections

These problems can reduce efficiency and potentially allow combustion gases to enter the home.

Homeowners should periodically check that exterior exhaust vents remain clear of snow, ice, or debris during winter months.

Install Carbon Monoxide Detectors

Because gas furnaces burn fuel, they produce combustion gases that may contain carbon monoxide (CO) if the system is not operating properly.

Carbon monoxide is colorless and odorless, which makes detectors extremely important for safety.

Homes should have carbon monoxide detectors:

• On each level of the home

• Near sleeping areas

• In accordance with local safety recommendations

Detectors should be tested regularly and batteries replaced as needed.

The Role of a Home Inspection

A professional home inspection can help identify conditions that affect both furnace efficiency and safety. Common findings during inspections include:

• Aging or inefficient furnaces

• Air leakage and insulation deficiencies

• Improper furnace venting

• Restricted airflow

• Signs of poor furnace maintenance

Understanding these conditions can help homeowners improve energy efficiency, reduce heating costs, and maintain a safe home environment.

Clarity Property Inspections, LLC provides professional home inspections throughout Central Ohio, including Galena, Sunbury, Delaware, Westerville, and the greater Columbus area. Our inspections evaluate major systems such as HVAC, insulation, ventilation, and structure so homeowners can better understand how their home is performing.

If you are buying a home or want a clearer understanding of its systems, schedule an inspection today to gain clarity, confidence, and peace of mind.