A Complete Guide for Central Ohio & Southwest Florida Homes

Key Takeaways

• Home heating typically accounts for 25–40% of a Gahanna or Columbus homeowner’s energy bill, and selecting the right system combined with proper maintenance can significantly reduce those costs over the lifetime of your equipment.
• Furnaces, boilers, and heat pumps are the most common whole-home heating systems DorMar Heating, Air Conditioning & Plumbing installs and services, while fireplaces, pellet stoves, and electric space heaters typically serve as supplemental heat sources.
• Modern high-efficiency gas furnaces (95%+ AFUE) and cold climate heat pumps can dramatically reduce energy use compared to older equipment installed before 2000, often cutting fuel consumption by 20–30%.
• Insulation, air sealing, thermostat programming, and regular tune-ups are just as important as equipment choice when it comes to maintaining a comfortable temperature and maximizing efficiency.
• Homeowners in Central Ohio and Southwest Florida can schedule a heating inspection, repair, or free replacement estimate with DorMar Heating, Air Conditioning & Plumbing to ensure their home stays warm and energy efficient all winter long.

Understanding Home Heating Systems & Energy Use

A home heating system refers to the equipment and distribution network that generates and delivers heat energy throughout your living spaces. This typically includes a furnace, boiler, or heat pump as the primary heat source, along with the means to distribute that warm air or hot water—whether through ductwork, radiators, baseboard heaters, or radiant floor tubing. Understanding how these components work together is the first step toward making informed decisions about repairs, upgrades, and energy savings.

The numbers tell a compelling story about where your money goes. Heating often represents about 29–45% of a typical U.S. home’s energy bills, with Central Ohio homeowners seeing higher percentages during the January and February cold snaps when winter temperatures drop well below freezing. In Southwest Florida, space heating demands are generally lower, but the same equipment often handles both heating and cooling, making year-round efficiency critical.

Efficiency ratings help you compare systems on an apples-to-apples basis:

A 20-year-old furnace with 80% AFUE wastes 20 cents of every fuel dollar up the flue, while a modern 96% AFUE unit captures nearly all that heat produced for your home. However, upgrading equipment alone delivers limited results without a whole-house approach that addresses insulation gaps, air leaks, duct sealing, and smart thermostat settings.

At DorMar, our technicians diagnose existing systems, provide honest repair-versus-replace guidance, and tailor solutions to local climate conditions and fuel availability. Whether you have access to natural gas in a Columbus suburb or rely on propane in a more rural area, we help you find the most cost effective path to comfort.

Furnaces: The Most Common Home Heating System

Gas furnaces remain the most common heating system DorMar services throughout Central Ohio, where natural gas infrastructure reaches most neighborhoods in Gahanna, Westerville, Dublin, and Columbus proper. In Southwest Florida, electric furnaces and heat pump air handlers are more prevalent, reflecting different fuel costs and milder winter months.

How a Forced-Air Furnace Works

A forced-air furnace operates on a straightforward principle. The burner—fueled by natural gas, propane, or fuel oil—or electric resistance heating elements generate heat within a metal heat exchanger. This exchanger acts as a barrier, allowing heat energy to transfer to indoor air while keeping combustion byproducts safely separated and vented outdoors through a flue pipe.

A blower fan then pushes the heated air through your existing ductwork to supply registers in each room. Return ducts pull cold air back to the furnace to be reheated, creating continuous circulation that maintains your desired temperature.

Fuel Options by Region

Your fuel choice depends largely on what’s available in your area:

• Natural gas: The most common fuel in Columbus suburbs, delivered through utility pipelines with no on-site storage required
• Propane: Popular in rural Central Ohio areas without gas service, requiring a tank on your property and regular deliveries
• Fuel oil: Less common but still found in some older homes, typically stored in basement or outdoor tanks
• Electricity: Powers electric furnaces and air handlers, often paired with heat pumps in Florida where electricity rates and mild winters favor this approach

Efficiency Tiers and Modern Controls

Furnace efficiency falls into distinct categories:

High-efficiency condensing furnace models extract additional heat from exhaust gases that would otherwise escape, using a secondary heat exchanger and draining away the resulting condensate. This technology can save 15–20% on gas bills compared to standard 80% AFUE units. If you live in a rural area and want to compare electric, propane and oil furnaces, learn more here.

Modern controls further improve comfort and help you save energy:

• Programmable and smart thermostats automate temperature setbacks
• Variable-speed blowers adjust airflow for quieter, more even heating
• Two-stage or modulating burners match heat output to actual demand, reducing temperature swings

Common Furnace Issues

DorMar technicians regularly address these furnace problems:

• Ignition failures (pilot light or electronic igniter issues)
• Cracked heat exchangers (a safety concern requiring immediate attention)
• Blower motor failures or worn bearings
• Dirty burners affecting combustion efficiency
• Carbon monoxide leaks from damaged venting

If your furnace is over 15 years old, requires frequent repairs, or your gas bills seem unusually high, it may be time to consider replacement rather than another costly repair.

Boilers & Hydronic Heating

Boilers are less common than furnaces in newer Central Ohio construction, but DorMar still services many older properties and light commercial buildings that rely on hydronic heating. These systems offer unique comfort advantages that many homeowners appreciate. Boilers heat water and circulate it through pipes to provide consistent and quiet heating, but they do not provide cooling.

How Boiler Systems Work

A boiler heats water—or in older systems, creates steam—using a combustion chamber fueled by natural gas, propane, or fuel oil. The heated water (typically 140–180°F for hot water systems) travels through pipes to distribution points throughout your house:

• Radiators: Cast iron or baseboard units that radiate heat into rooms
• Baseboard heaters: Low-profile units along walls that use convection to circulate hot water heat
• Radiant floor loops: Tubing embedded in floors that warm surfaces directly

A circulator pump propels water through the system, and after releasing its heat, the cooled water returns to the boiler to be reheated. Steam systems work differently—water boils to steam that rises naturally through pipes, condenses in radiators while releasing latent heat, then returns as water.

Fuel Options for Boilers

Most boilers in Central Ohio run on either standard or high efficiency settings; if you’re interested in the differences between 80% efficiency and 95% efficiency furnaces, this guide provides helpful information.

• Natural gas (most common in urban and suburban areas)
• Fuel oil (found in many older installations)
• Propane (for properties without gas access)
• Electric boilers (less common but available for specific applications)

Comfort and Efficiency Advantages

Boiler systems provide several benefits over forced-air heating:

• Even, gentle heat without the drafts or dust circulation of furnace systems
• Quiet operation with no blower noise
• Easy zoning with multiple thermostats controlling different areas
• Improved indoor air quality since there’s no air being blown through ducts

Modern condensing gas boilers can achieve efficiencies in the 90%+ range by extracting additional heat from exhaust gases. However, these units require proper venting and condensate drainage, making professional installation essential.

DorMar services and replaces many older cast-iron boilers in Central Ohio homes, often combining equipment replacement with thermostat upgrades and radiator valve improvements to maximize comfort and efficiency from hot water systems.

Heat Pumps & Ductless Systems

Heat pumps represent a fundamental shift in how we think about home heating systems. Unlike furnaces and boilers that generate heat through combustion, heat pumps move existing heat energy from one place to another—making them remarkably efficient, especially in moderate climates. They’re increasingly popular in both Central Ohio and Southwest Florida due to their dual heating and cooling capability and various utility incentives.

How Air Source Heat Pumps Work

An air source heat pump works like a central air conditioner that can run in reverse. In summer, it extracts heat from indoor air and pumps it outside to cool your home. In winter, it does the opposite—extracting heat from outdoor air (even when it’s cold) and moving it indoors.

This process uses refrigerant and a compressor to concentrate low-grade heat from ambient outdoor air into useful heat for your living spaces. The result is remarkably efficient: for every unit of electricity consumed, a heat pump can deliver 2–4 units of heat energy, depending on conditions.

System Types and Configurations

Heat pumps come in several configurations to suit different homes:

Centrally-ducted heat pumps connect to your existing ductwork and can often replace an old furnace or central air conditioner. In Ohio, many homeowners opt for dual-fuel systems that pair a heat pump with a gas furnace—the heat pump handles heating efficiently when outdoor air temperatures are above 35–40°F, while the furnace takes over during the coldest winter months.

Ductless Mini Split Systems

A mini split system connects an outdoor unit to one or more indoor wall-mounted or ceiling cassettes via small refrigerant lines. This setup is ideal for:

• Room additions without access to existing ductwork
• Older Columbus-area homes built before central air conditioning
• Florida rooms, sunrooms, or converted spaces
• Zoned heating and cooling for different comfort preferences

Cold Climate Performance

Modern cold climate heat pumps have largely overcome the limitations of older models. Today’s variable-speed inverter compressors can provide efficient heat at outdoor temperatures down to 5°F to -5°F, covering the vast majority of Central Ohio winter conditions. These systems run longer at lower capacity rather than short cycling, delivering steadier temperatures and better humidity control.

Efficiency ratings for heat pumps include HSPF2 (heating season performance factor) and SEER2 (seasonal energy efficiency ratio for cooling). ENERGY STAR certified models with HSPF2 ratings above 8.5 can deliver significant savings compared to electric resistance heating or older equipment.

DorMar provides heat pump installation, repair, and annual tune-ups, plus assistance with utility rebates and federal tax credits available through at least 2032 under current law.

Space Heaters, Stoves & Fireplaces: Supplemental Heat Sources

While furnaces, boilers, and heat pumps provide heat for your entire house, many homeowners also use supplemental heating options to warm a single room or add ambiance. These sources typically complement rather than replace a central heating system in DorMar’s service areas.

Portable Electric Space Heaters

Electric heaters offer quick, convenient spot heating. Common 1,500-watt units can warm a single room quickly but draw nearly a full 15-amp circuit’s worth of power. While they convert electricity to heat at close to 100% efficiency, the cost per BTU is often higher than running a central system.

Best uses for electric space heaters include:

• Temporarily heating a room while the rest of the house is at a lower setpoint
• Providing extra warmth in a drafty area while awaiting repairs
• Heating spaces where extending ductwork isn’t practical

However, relying on electric heaters as a primary heat source typically costs more energy and delivers less consistent comfort than a properly functioning central system.

Gas-Fired Space Heaters

Wall or floor-mounted units fueled by natural gas or propane can provide heat for garages, workshops, cabins, or other buildings where a full HVAC system isn’t practical. Proper venting and code compliance are essential—these are combustion appliances that produce exhaust gases requiring safe disposal.

A Word About Unvented Gas Heaters

Unvented (vent-free) gas or kerosene heaters should not be used as primary heat sources in living spaces. While they’re efficient at converting fuel to heat, they release combustion byproducts directly into your indoor air, including:

• Carbon monoxide
• Nitrogen dioxide
• Water vapor (which can cause moisture problems)

Many jurisdictions restrict or prohibit these devices in occupied spaces. DorMar strongly recommends against using unvented heaters where family members sleep or spend extended time.

Wood-Burning and Pellet Stoves

For homeowners with access to affordable firewood or who own wood on their property, wood-burning and pellet stoves can significantly reduce heating costs. Pellet stoves burn compressed wood pellets and offer more consistent heat output with automated feeding systems.

Key considerations include:

• EPA-certified models burn cleaner and more efficiently than older stoves
• Proper chimney installation and annual maintenance are essential
• Adequate clearance to combustibles must be maintained
• A supply of seasoned wood or pellets must be stored and managed

Fireplaces: Ambiance vs. Efficiency

Traditional open wood fireplaces provide ambiance but often lose more heat than they provide. The chimney acts as a pathway for hot air to escape, pulling warm air out of your house even after the fire dies down.

Options to improve fireplace efficiency include (for more information about our company and legacy, see our About page):

• Gas inserts that provide heat without the trapped air loss of open fires
• Tight-sealing glass doors to reduce draft when not in use
• Outside air kits that supply combustion air from outdoors rather than conditioned indoor air

Safety Reminders

Whenever using combustion-based heating:

• Install carbon monoxide alarms near all sleeping areas
• Schedule annual chimney inspections and cleaning
• Maintain safe clearances between heat sources and combustible materials
• Never use ovens, grills, or other devices not designed for space heating

State-of-the-Art & High-Efficiency Heating Options

Beyond standard furnaces and heat pumps, modern technology offers sophisticated solutions that DorMar encounters in new construction and major renovations throughout Central Ohio and coastal Florida communities. These systems deliver exceptional comfort and efficiency for homeowners willing to invest in premium equipment. Some advanced systems can also provide domestic hot water in addition to space heating.

Radiant Floor Heating

Radiant floor systems circulate hot water through tubing embedded in concrete slabs or installed beneath subfloors. This approach delivers “from the ground up” comfort, warming objects and people directly rather than relying on air circulation.

Benefits include:

• Even heat distribution with no cold spots or drafts
• Silent operation without blower noise
• Excellent efficiency when paired with modern boilers or heat pumps
• Popular for basements, bathrooms, and whole-home applications in new construction

Radiant systems work particularly well with lower water temperatures than traditional radiators, making them an excellent match for high-efficiency condensing boilers or heat pumps.

Advanced Ductless Solutions

Ductless mini split systems have evolved into a state-of-the-art solution for retrofit situations. Modern units feature:

• Inverter-driven compressors that adjust output precisely to match demand
• Ultra-quiet indoor units operating below 25 decibels
• Individual room zoning to avoid over-heating unused areas
• Heating capability down to -5°F or colder with cold climate models

For older Columbus homes without existing ductwork, a multi-zone mini split can provide highly energy efficient heating and air conditioning without the expense and disruption of installing ducts.

Connected and Smart Systems

Advanced gas furnaces and boilers now feature sealed combustion for improved safety and indoor air quality, along with smart connectivity options:

• Wi-Fi thermostats with remote access and scheduling
• System monitoring that alerts you to maintenance needs
• Remote diagnostics that can help technicians prepare for service calls
• Integration with home automation platforms

Geothermal Heat Pumps

Ground-source (geothermal) heat pumps represent the pinnacle of heating efficiency, achieving coefficients of performance (COP) of 3–5. These systems take advantage of the earth’s constant temperature, which remains stable year-round and contributes to their high efficiency. These systems use buried loops filled with antifreeze solution to exchange heat with the earth, which maintains a steady 50–60°F temperature year-round. Ground-source heat pumps are much more efficient than air-source heat pumps.

While installation costs are higher ($20,000–30,000 or more) due to drilling or trenching requirements, geothermal systems can deliver $1,000+ in annual savings for long-term homeowners. They’re most practical when:

• The property has adequate space for ground loops
• The homeowner plans to stay many years to recoup installation costs
• Major renovations are already planned that can incorporate the system

Sizing, Efficiency & Choosing the Right System for Your Home

Selecting the right heating system involves more than picking the most powerful unit available. Proper sizing and design matter enormously—an oversized system can cause comfort problems, humidity issues, and unnecessary wear from short cycling, while an undersized system will struggle to maintain a comfortable temperature during extreme cold.

Heat Load Calculations

HVAC professionals use Manual J calculations (or similar methods) to determine the right system size for your specific home. These calculations factor in:

• Square footage and ceiling heights
• Insulation levels in walls, attic, and foundation
• Window type, size, and orientation
• Air leakage from gaps and cracks
• Local climate data (Columbus sees very different winter temperatures than Naples)
• Internal heat gains from appliances, lighting, and occupants

For example, a typical 2,000 square foot Central Ohio home might need a furnace in the 60,000–100,000 BTU/h range, depending on insulation quality and air sealing. A poorly insulated home with drafty windows requires more energy to maintain the same amount of comfort as a well-sealed structure.

Balancing Upfront and Operating Costs

Higher-efficiency systems typically cost more initially but can pay for themselves through lower gas or electric bills over their lifespan. Consider this comparison:

The higher-efficiency unit costs more upfront but uses less fuel year after year. When you factor in available rebates and tax incentives, high-efficiency equipment often becomes the clear winner for homeowners planning to stay in their property.

Environmental Considerations

Lower fuel use means fewer emissions. Electric heat pumps powered by increasingly cleaner electrical grids can significantly reduce a home’s carbon footprint compared to combustion-based heating. For environmentally conscious homeowners, the shift toward electrification—especially with renewable-powered grids—offers a path to dramatically lower household emissions.

DorMar’s Consultation Process

Our technicians conduct thorough in-home evaluations before recommending equipment. This process includes:

• Reviewing existing equipment age, condition, and efficiency
• Inspecting ductwork for leaks, damage, or sizing issues
• Documenting comfort complaints (cold rooms, drafts, humidity problems)
• Assessing your electrical system capacity for heat pump options
• Presenting multiple options (repair, mid-efficiency replacement, high-efficiency upgrade)

This approach ensures you receive recommendations tailored to your home, budget, and priorities rather than a one-size-fits-all solution.

Maintenance, Safety & DorMar Home Comfort Membership

Annual tune-ups are essential for furnaces, boilers, and heat pumps. Regular maintenance improves efficiency, prevents breakdowns during January cold snaps when you need heat most, extends equipment life, and verifies safe operation. The small investment in preventive care typically pays for itself through avoided repairs and lower energy bills.

What Professional Maintenance Includes

DorMar technicians perform comprehensive tune-ups that include:

For Furnaces:

• Cleaning burners and inspecting flame characteristics
• Checking heat exchanger for cracks or corrosion
• Testing safety controls and limit switches
• Lubricating blower motor and other moving parts
• Verifying proper gas pressure and combustion
• Inspecting flue pipe and venting
• Testing thermostat operation and calibration

For Heat Pumps:

• Checking refrigerant charge and looking for leaks
• Cleaning indoor and outdoor coils
• Inspecting electrical connections
• Testing defrost cycle operation
• Verifying reversing valve function
• Checking auxiliary heat operation

Regular HVAC maintenance contributes to better indoor air quality, but don’t forget about other hidden threats like radon and its impact on home insurance.

For Boilers:

• Inspecting and cleaning burners
• Checking water pressure and expansion tank
• Testing safety valves and controls
• Inspecting heat exchanger and flue
• Bleeding air from radiators if needed

Safety Verification

Every maintenance visit includes safety checks that protect your family:

• Carbon monoxide testing in and around the appliance
• Gas leak inspection using electronic detectors
• Verifying proper combustion air supply
• Checking venting systems for blockages or deterioration
• Ensuring smoke and CO detectors are present and functional

These checks are especially important in tightly sealed modern homes where combustion air may be limited.

DorMar Home Comfort Membership Benefits

Our membership program provides peace of mind and real value:

• Priority scheduling during peak heating and cooling seasons
• Discounted rates on repairs
• Annual heating and cooling tune-ups included
• Documentation that supports warranty compliance
• No overtime charges for after-hours service

What Homeowners Can Do Between Visits

Simple tasks help maintain efficiency and catch problems early:

• Change furnace filters every 1–3 months (more often with pets or allergies)
• Keep supply and return vents unblocked by furniture or rugs
• Clear leaves and debris from around outdoor heat pump units
• Monitor energy bills for unusual spikes that might indicate problems
• Listen for new sounds or observe any changes in system operation

Regular attention to these basics helps your system run smoothly and alerts you to potential issues before they become expensive repairs.

Ready to schedule service, emergency repair, or a free replacement estimate? DorMar Heating, Air Conditioning & Plumbing serves homeowners throughout Central Ohio and Southwest Florida with the professional, reliable service we’ve provided since 1962.

FAQ

How often should I replace my home heating system?

Most heating equipment has a predictable lifespan: gas furnaces typically last 15–20 years, boilers can run 15–25 years with proper maintenance, and heat pumps generally last 10–15 years. However, age alone shouldn’t drive replacement decisions—repair frequency, safety concerns, and energy costs matter just as much.

Once repairs become frequent or major components like heat exchangers or compressors fail, replacement often makes more financial sense than continued repairs. This is especially true for systems installed before around 2005, which typically operate at significantly lower efficiencies than current models.

DorMar can inspect your existing equipment and provide a written comparison of repair versus replacement options specific to your home’s needs and your budget.

Is it better to repair or replace an older furnace or boiler?

For systems under 10 years old in generally good condition, repair is usually the reasonable choice. As equipment ages past 15 years, replacement increasingly makes sense—particularly if the repair involves an expensive component or the system has had multiple issues recently.

Consider the energy savings potential: replacing an 80% AFUE furnace from the 1990s with a 95–98% AFUE model can reduce your gas consumption by 15–20%, which adds up significantly over Ohio winters. When repair costs exceed roughly half the price of replacement, most homeowners benefit from investing in new equipment.

Our technicians provide upfront pricing and can estimate potential savings from efficiency upgrades to help you make an informed decision.

What thermostat settings save the most money without sacrificing comfort?

In Central Ohio winters, setting your thermostat to around 68°F when you’re home and awake provides a good balance of comfort and efficiency. Lowering the temperature by 6–8°F when sleeping or away for several hours can reduce heating costs by 10–15% without significant comfort sacrifices.

Programmable and smart thermostats automate these setbacks, learning your schedule and adjusting automatically. This approach is more effective than frequent manual changes, which can cause the system to work harder to recover from deep setbacks.

DorMar can install and configure smart thermostats compatible with your existing furnace, boiler, or heat pump, helping you save money while maintaining comfort.

Are heat pumps really efficient in Central Ohio’s cold winters?

Modern cold climate heat pumps have overcome the limitations that made older models impractical in Ohio. Current technology can provide efficient heating at temperatures close to 0°F, covering nearly all Central Ohio winter conditions without significant efficiency loss.

Many homeowners choose dual-fuel systems: the heat pump provides efficient heating when outdoor temperatures are above 35–40°F (which covers much of the heating season), while a gas furnace handles the coldest nights. This combination maximizes efficiency year-round while ensuring reliable comfort during polar vortex events.

DorMar designs systems based on local climate data and your specific priorities, explaining expected performance before installation so you know exactly what to expect.

What should I do if my heat goes out on a very cold night?

Start with basic troubleshooting: verify thermostat settings and batteries, check that the system has power (look at the breaker panel), confirm the gas supply is on if applicable, and ensure the filter isn’t completely clogged restricting airflow.

If these checks don’t reveal the problem, focus on staying safe while waiting for service. Close doors to unused rooms to concentrate heat in occupied spaces. Add layers of clothing and use extra blankets. Never use ovens, grills, or unvented heaters for emergency heat—these create serious carbon monoxide and fire risks.

DorMar offers emergency heating repair in Central Ohio and Southwest Florida. If you suspect a gas leak or carbon monoxide issue, evacuate immediately and contact emergency services before calling for HVAC service.

Steven Brewer

I started in the HVAC business as a young man, with my father putting me in crawl spaces to run ductwork while on summer vacation from school; I began full time in our family HVAC business at the age of 19.

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