The right furnace, sized and vented correctly.
Furnace replacement for homes across the Oklahoma City and Tulsa metros. The choices that matter are fuel, size and venting, and they get decided before you ever pick a brand. A furnace installed wrong is unsafe as well as inefficient.
Planning a replacement?
Get a quote that explains the whole job. We size it for your house and tell you honestly whether to do the air conditioner at the same time.
(800) 555-0120 Request a quote- Sized with a load calculation, not the old furnace.
- A written quote you can compare line for line.
- Permit and inspection handled as part of the job.
What matters most when replacing a furnace? Correct sizing from a load calculation, the right fuel and efficiency for how you actually live, and venting that is done to code. A furnace is a combustion appliance, so unlike an air conditioner a bad install is not just inefficient, it can be unsafe. The equipment brand matters far less than whether the person installing it sizes it properly, vents it correctly, and verifies combustion on the day.
A furnace is sold on brands and efficiency ratings, but that is not where the decision is really made. It is made on three things: what fuel makes sense for your home, what size it actually needs, and whether the venting and combustion are set up correctly. Get those right and a mid-range furnace will serve you well for many years. Get them wrong and the best furnace on the market will run poorly, cost too much to heat with, or worse.
When replacement is the right call
- The heat exchanger is cracked. This is the metal wall that keeps combustion gases out of your air, and it is condemned rather than repaired, so on an older furnace it means replacement.
- A major component has failed on a furnace near the end of its service life, which for a gas furnace is commonly in the range of fifteen to twenty years.
- Repairs are stacking up season after season.
- Heating bills have climbed and the furnace is well behind current efficiency.
- The house was never evenly warm, which is often a sizing or duct issue a like-for-like swap will inherit.
Fuel and system choice
Most homes here heat with a gas furnace, and if you already have gas and ductwork, a gas furnace is usually the straightforward path. But it is worth understanding the options before you assume like-for-like:
| Option | Makes sense when | Worth knowing |
|---|---|---|
| Gas furnace | You already have gas service and ducts, and want strong heat on the coldest nights | The regional default. Efficiency is rated by AFUE, and higher efficiency models vent differently |
| Heat pump | You want one system for heating and cooling, and lower running costs in a mild-to-moderate climate | Heats efficiently down to cold temperatures, then leans on backup heat below that. Worth a real look here |
| Dual fuel (heat pump plus gas) | You want heat pump efficiency most of the winter and gas heat for the hardest freezes | The system switches to gas when it is more economical. More upfront, lower running cost |
| Electric furnace | There is no gas service to the home | Simple, but electric resistance heat is expensive to run. A heat pump is usually the better all-electric answer |
We will lay out what each would cost to install and to run for your house, so it is a numbers decision rather than a default.
Sizing and efficiency
As with an air conditioner, the right size is worked out with a Manual J load calculation, not copied from the old furnace, which may well have been oversized to begin with. An oversized furnace short cycles, heats unevenly, and wears itself out faster. A correctly sized furnace runs longer, gentler cycles that keep the whole house evenly warm.
Efficiency is rated as AFUE, the percentage of fuel that becomes heat in your home rather than going up the flue. A higher AFUE furnace costs more and burns less gas. Whether the difference pays back depends on how cold your winters run and how long you will stay in the house, and we will show you those numbers rather than just pointing at the higher shelf.
Venting is a safety matter, not a detail
A furnace has to vent its combustion gases safely out of the house, and high-efficiency furnaces vent differently from older ones, often through a sidewall in plastic pipe rather than up the old flue. Getting the venting right is not optional and it is not the place to cut a corner. A replacement quote should say how the new furnace will be vented, and the install should be inspected. This is one of the reasons the permit and inspection on this page are not red tape.
What a real quote contains
| The quote should state | Why it belongs there |
|---|---|
| The load calculation result | Proof the size fits your house, not the old furnace |
| The exact furnace, by model number | So you can look up its efficiency and warranty yourself |
| AFUE efficiency rating | How much of the gas you buy becomes heat in your home |
| How it will be vented | A safety matter, and a common source of price differences between quotes |
| Thermostat, and any gas or electrical work | The parts a thin quote leaves out and charges for later |
| Permit and inspection | Required for a combustion appliance, and the independent safety check that protects you |
| Startup and combustion check | Verifying it lights, heats and vents correctly on the day, in writing |
| The labor warranty, plainly | The manufacturer warrants parts. Who stands behind the workmanship, and for how long |
When two furnace quotes are far apart, the venting and the included extras are usually where the gap is hiding.
What installation day looks like
Protect the house
Floor coverings to the equipment, old furnace hauled away, the space left clean.
Remove and prepare
Old furnace out, gas and electrical safely disconnected, the space prepared for the new unit.
Set, connect and vent
New furnace set, gas and electrical connected, and the venting run correctly for this furnace's efficiency, which is the step that matters most for safety.
Start up and verify combustion
It is lit, the flame checked, gas pressure set, temperature rise measured, and combustion and venting confirmed. Written down.
Walk you through it
Thermostat, filter schedule, what the warranty covers and how to register it. Then the paperwork and the permit inspection.
Red flags in a competing quote
Be cautious if
- The size matches your old furnace with no load calculation.
- Venting is never mentioned, especially on a high-efficiency furnace.
- Permit and inspection are left out or called unnecessary.
- There is a today-only deadline on the price.
- The startup and combustion check are not mentioned.
- It is one line and a total, with no model number.
Good signs
- They sized it with a load calculation.
- They explained how the new furnace will be vented.
- The quote names the furnace and its AFUE rating.
- Permit, startup and labor warranty are itemized.
- They talked honestly about doing the air conditioner at the same time, or not.
- Nobody rushed you.
Questions and answers
How much does a new furnace cost?
It depends on the size your house needs, the fuel and efficiency you choose, and the venting the new furnace requires, which is why an honest number needs someone looking at your home. A standard-efficiency gas furnace on existing venting sits at the lower end. A high-efficiency furnace that needs new venting, or a dual-fuel system, costs more and often earns it back in running cost.
The quote explains what drives the number, and the price holds once the job starts unless we find something hidden and you approve it.
Should I replace the air conditioner at the same time?
Often it is worth it, and worth an honest look. The air conditioner's indoor coil sits on top of the furnace, and if the air conditioner is also near the end of its life, doing both together usually costs less than two separate jobs and gives you a properly matched system.
If your air conditioner is newer and in good shape, we will tell you to keep it. We only recommend replacing what genuinely needs it.
What is AFUE and how high should I go?
AFUE is the efficiency rating for a furnace, the percentage of the fuel you buy that becomes heat in your home rather than going up the vent. A higher number means lower gas bills. New furnaces have a legal minimum, and you can pay more for higher ratings.
Higher efficiency pays back faster in colder climates and over longer ownership. In this region winters are real but not brutal, so the payback is a genuine calculation rather than an obvious yes, and we will run it for your house.
Do I need a permit to replace my furnace?
Yes, in most jurisdictions here, and for a furnace it matters even more than for an air conditioner, because a furnace burns fuel and vents combustion gases. The inspection is an independent check that the venting and combustion were done safely and to code.
A quote that skips the permit is skipping that safety check, and it leaves you with unpermitted work on a combustion appliance. We pull the permit and handle the inspection as part of the job.
How long does a furnace installation take?
A straightforward replacement is usually a single-day job. If the venting has to change, as it often does when moving to a high-efficiency furnace, or if there is gas or electrical work involved, it can take longer, and we will tell you that up front.
The combustion and venting checks at the end take the time they take. Those are the steps that keep you safe, and they do not get rushed.
Is a high-efficiency furnace worth it in Oklahoma?
Sometimes. A high-efficiency furnace burns less gas, but it costs more to buy and often needs new venting, which adds to the install. The payback depends on how much you run it and how long you will stay in the house.
In a climate with real but moderate winters, the answer is a genuine calculation rather than an automatic yes. We will show you the install cost and the running-cost difference side by side so you can decide on the numbers, not on a sales pitch.
Related
Get a furnace quote that explains itself.
We will size it, walk through fuel and efficiency in plain numbers, and tell you honestly whether to do the air conditioner too.
(800) 555-0120