Based on industry pricing data, a replacement gas furnace typically runs $3,500 to $6,500 installed for a standard-efficiency model and $5,000 to $9,500 for a high-efficiency condensing model. An electric furnace typically runs $2,500 to $6,000, and replacing the furnace and the central air conditioner at the same time typically runs $8,000 to $15,000. Those are typical installed cost ranges for the region, not a quote from us. The actual price for your home depends on an in-home assessment of the heating capacity you need, the venting the new unit requires, and the condition of your ductwork.
717 Mechanical LLC has installed and replaced furnaces across Lancaster County from our shop in Marietta since 2012. This guide explains where those ranges come from, what pushes a job toward the low or high end, and how to decide whether the furnace you have is worth repairing one more time. When you are ready for a real number, we come out, measure the house, and quote the job upfront.
Ready to skip the reading? See our furnace installation in Marietta, PA page or call (717) 468-9567.
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The table below shows typical installed cost ranges by furnace type, based on industry pricing data. "Installed" means the equipment, labor, removal of the old unit, and the standard connections. Ductwork repairs, new venting, and electrical work are extra when a house needs them, which is why the ranges are wide.
| System type | Typical installed range (national) | Best for |
|---|---|---|
| Standard-efficiency gas furnace (80% AFUE) | $3,500 to $6,500 | Straightforward swaps with existing venting |
| High-efficiency gas furnace (90-97% AFUE) | $5,000 to $9,500 | Lower gas bills; needs PVC venting |
| Electric furnace | $2,500 to $6,000 | Homes without gas service |
| Furnace + central AC combo | $8,000 to $15,000 | Both systems near end of life |
Ranges are national averages for context: your home's size, venting, and ductwork change the number. 717 Mechanical quotes your exact price upfront before any work, and that quote comes from an in-home assessment, not a table.
A note on the last row. If your air conditioner is also past its useful life, replacing both at once usually costs less than two separate projects because the crew is already there, the blower in the new furnace is matched to the new coil, and you pay for one set of permits and one day of labor instead of two. If the AC is only a few years old, leave it alone and replace the furnace by itself.
Two houses on the same street in Columbia can get very different furnace quotes, and the reasons are almost always on this list. Knowing them ahead of time makes any estimate easier to read.
AFUE is the share of the fuel a furnace turns into heat for the house over a season. A standard-efficiency furnace sits at 80% AFUE and vents through the existing metal flue. A high-efficiency condensing furnace runs 90% AFUE and up, pulls extra heat out of the exhaust, and costs more to buy. In a Lancaster County winter, where a furnace runs for months, the gas savings from the higher tier add up, but the equipment premium is real and has to be weighed against how long you plan to stay in the house.
Furnaces are sized in BTUs of heat output, and a bigger furnace costs more. The right size comes from a load calculation that accounts for square footage, insulation, window area, ceiling height, and how leaky the house is, not from the size stamped on the old unit. Many furnaces installed in the older brick and frame homes around Marietta, Mount Joy, and Lancaster city were oversized to begin with, so the correct replacement is sometimes smaller and cheaper than the homeowner expects. An oversized furnace short cycles, wears out sooner, and leaves rooms uneven.
A new furnace can only deliver what the ducts will carry. Crushed flex runs, disconnected joints in a basement or crawlspace, undersized returns, and duct systems added decades after the house was built all show up in a quote as sealing, resizing, or replacing sections. Skipping this work to save money is a false economy, because a starved furnace trips its safety limits and never reaches its rated efficiency.
A condensing furnace does not use the old chimney. It vents through PVC pipe run to an outside wall and needs a drain for the acidic condensate it produces. Routing that pipe through a stone foundation or a finished basement, and adding a condensate pump when there is no floor drain nearby, are the usual reasons a high-efficiency install lands at the top of its range. When the old furnace shared the chimney with a water heater, the water heater may also need a liner or its own vent once the furnace stops using the flue.
Hauling out the old furnace and disposing of it is normally part of the installed price. Items that can show up as separate lines include a new thermostat, a media filter cabinet, a whole-home humidifier, gas line changes, electrical work for a variable-speed blower, and the permit and inspection your municipality requires. A written quote should list each of these so you can see exactly what you are paying for.
Most furnace replacements start as a repair call. The technician finds the failed part, quotes the fix, and the homeowner has to decide on the spot whether that money is better spent on a new system. Two simple tests handle most of those decisions.
If a repair estimate is more than half the cost of a comparable new furnace, replacement is usually the better use of the money. The logic is that a furnace old enough to need an expensive repair is also old enough to need the next one soon, so the repair buys less time than it appears to. Under that line, repair it and keep up with maintenance. We give you both numbers on the same visit so the comparison is easy.
A gas furnace has a design life of roughly 15 to 20 years. Inside that window, a single failed part on an otherwise sound unit is worth fixing. Past it, the heat exchanger, blower motor, and control board are all approaching the end of their service life at the same time, and a repair on one of them rarely makes financial sense. A furnace that is both past 15 years and facing a repair above the 50% line is a clear replacement.
These are typical repair ranges from industry pricing data, listed so you can hold them up against the replacement ranges above. The diagnostic fee to find the fault is separate from the repair itself.
| Repair | Typical range (national) |
|---|---|
| Ignitor / flame sensor | $150 to $400 |
| Blower motor | $400 to $1,500 |
| Control board | $400 to $1,200 |
| Heat exchanger | $1,000 to $3,500 (often replacement territory) |
Ranges are national averages for context: your home's size, venting, and ductwork change the number. 717 Mechanical quotes your exact price upfront before any work, and that quote comes from an in-home assessment, not a table.
The heat exchanger row deserves a closer look. A cracked heat exchanger is a safety problem, because it can let combustion gases into the air the blower sends through the house, and the repair means opening up the furnace and replacing its largest component. On any furnace past its first decade, that estimate almost always lands above the 50% line, which is why a cracked exchanger usually ends the repair conversation and starts the replacement one. Ignitors, flame sensors, and capacitors are the opposite: cheap, quick, and worth doing on almost any furnace that is otherwise healthy. Our furnace repair in Marietta, PA team handles those on the same visit whenever the part is on the truck.
The cheapest and least stressful time to replace a furnace is when you do not need it: spring and early fall. In the shoulder seasons installers are not buried in no-heat calls, scheduling is flexible, and you have time to compare a standard-efficiency and a high-efficiency quote side by side instead of taking whatever is in stock. A furnace that limps through one more winter on a failing blower or a rusted heat exchanger is a gamble, and the losing outcome is a January breakdown, a cold house, and a rushed decision. If your furnace is past 15 years or has needed repairs two winters in a row, plan the replacement for September or October so the new system is running before the first hard freeze. A fall furnace tune-up is the easiest way to find out whether the old one is likely to make it.
A furnace rarely fails at a convenient time, and most families would rather spread the cost than empty an emergency fund in the middle of winter. 717 Mechanical LLC offers financing through Service Finance and Wells Fargo, including 0% financing for 60 months on qualifying systems with approved credit. The application is quick and can be done from your phone before we arrive. Financing often makes a high-efficiency furnace practical when the up-front difference between tiers would otherwise be the deciding factor. Details, terms, and the application links are on our HVAC financing page, and you can ask about current promotions when you call.
We install American Standard and Armstrong Air gas furnaces, from single-stage standard-efficiency models to two-stage and variable-speed condensing units. As a local American Standard dealer we can walk you through the full lineup and match the tier to your budget and how long you plan to stay in the house. Every installation includes a load calculation, a look at the ductwork and venting, and a written quote before any work begins. See our furnace installation in Marietta, PA page for how the process works from the first visit to the final inspection.
The ranges in this guide are useful for setting expectations, but they cannot see your basement. A quote from a local installer accounts for the things that move the price: the age and layout of your ductwork, whether your chimney can keep venting a water heater on its own, where a PVC vent can exit the wall, and the actual heat load of a house that may have been built before insulation was standard. The right number for your home comes from an in-home assessment, and we provide that assessment and the written quote upfront, with no pressure to decide that day.
Call (717) 468-9567 for a QuoteAs a family-focused HVAC company, our mission is to provide honest service with a personal touch. We treat every home as if it were our own, ensuring high-quality workmanship and lasting results.
Our shop is on Maytown Road in Marietta, minutes from the river towns of Columbia, Mount Joy, and Wrightsville, and we replace furnaces throughout Lancaster County and the neighboring communities in York, Dauphin, and Lebanon Counties. Older brick and frame homes in these towns often have ductwork and chimneys that were never designed for the equipment attached to them today, which is exactly why an in-home assessment matters more than a national average.
Same-day service is available when scheduling allows, and every replacement quote is written and explained before any work starts.
Tell us the age of your furnace, what it has been doing, and roughly the size of your home, and we will schedule an in-home assessment and put a written price in your hands.
Call (717) 468-9567 to talk through your options.
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