Furnace Replacement Cost in West Des Moines: 2026 Guide

If you’re collecting furnace quotes in West Des Moines, you’ve probably noticed they’re all over the map. Part of that is the equipment, and part is the houses: WDM has a lot of bigger homes, finished basements and systems that were higher-end to begin with. By the end of this guide you’ll know what each efficiency level costs, what pushes a quote up, and when to replace the AC at the same time.

How much does a new furnace cost in West Des Moines?

Furnace type	Installed range	Typical fit
80% AFUE, single-stage	$4,000–$5,500	Like-for-like swap on an existing metal flue; tighter budgets
95–96% AFUE, two-stage	About $6,000–$7,500	Most two-story homes; quieter, more even heat
97%+ AFUE, variable-speed or modulating	About $7,500–$9,000	Larger homes, zoned systems, comfort-first buyers

Planning ranges for the Des Moines metro in 2026; your written quote depends on the equipment, access and what we find on site.

Taken together, high-efficiency furnaces run $6,000–$9,000. Two-stage units tend to land in the lower half and variable-speed or modulating units in the upper half, though brand, size and install details move either one. A complete quote includes the furnace, removal of the old one, labor, gas, venting and duct connections, the permit (most metro cities require one, and we pull it), a startup and combustion check, and warranty registration. Our work carries a one-year workmanship warranty on top of the manufacturer’s coverage.

AFUE is the share of the fuel’s heat that ends up in your house. An 80% furnace loses about a fifth of it; a 96% furnace loses about 4%. Over a long Iowa heating season, that gap shows up on every gas bill.

Why do West Des Moines furnace quotes run higher?

It’s the housing stock, not the zip code.

Around Jordan Creek, Glen Oaks and the newer neighborhoods on the city’s west and south sides, a lot of homes are 2,500 square feet or more, with finished walkout basements, vaulted great rooms and bonus rooms over the garage. Many were built with two-stage or variable-speed furnaces in the first place. Replacing like for like keeps you in the upper part of the range, and some larger homes have two systems or a zoned setup that adds to the job.

The older parts of town are a different story. Around historic Valley Junction and in WDM’s mid-century ranch neighborhoods, homes are smaller, but the furnace often vents into an old chimney and the ductwork was sized decades ago. Going high-efficiency there usually means new PVC venting and a look at the water heater, which can end up alone on that chimney.

What size furnace does my home need?

Square footage alone won’t tell you. The right size comes from a load calculation that accounts for insulation, windows, air leakage, which way the house faces, and the sub-zero design temperatures we plan for in central Iowa. A lot of the furnaces we replace are oversized, either because the original installer used a rule of thumb or because the home has since gotten new windows and better insulation.

Oversizing isn’t a safety margin. A furnace that’s too big heats in short blasts, shuts off, and starts again minutes later: more wear, bigger swings between floors, less comfort. Two-stage and variable-speed furnaces help because they spend most of the winter running on low.

Sizing also has to match your air conditioner. The furnace’s blower moves the air for cooling too, so it has to be rated for your AC’s tonnage. That’s one reason the furnace and AC decisions are tied together.

What drives the price of a furnace replacement up?

Venting conversion

Going from an 80% furnace to a 90%+ condensing furnace means new PVC intake and exhaust pipes through a side wall or the roof, a condensate drain, and sometimes a condensate pump. If the water heater shared the old chimney, it may need its own venting fix once the furnace leaves. Our water heater cost guide covers what that can involve.

Ductwork

Big houses often have long duct runs and too few returns. A new furnace can’t fix ducts that can’t move enough air, so sealing, adding a return or balancing is often part of getting the comfort you’re paying for.

Zoning

A two-story home with a bonus room that’s hot in summer and cold in winter is a strong candidate for zoning, which uses motorized dampers and separate thermostats for different parts of the house.

Humidifiers and other add-ons

Heated winter air in an Iowa house gets dry, and many WDM homeowners add a whole-house humidifier while the furnace is being replaced.

Add-on	Installed range
Duct sealing, adding a return, or balancing	$300–$1,500
Zoning system	$2,000–$4,500
Bypass humidifier	$500–$900
Fan-powered humidifier	$700–$1,100
Steam humidifier	$1,200–$2,500

Planning ranges for the Des Moines metro in 2026; your written quote depends on the equipment, access and what we find on site.

Pro tip: Ask every company quoting you whether they did a load calculation and what static pressure your ductwork measured. If the answer is “we matched what you had,” you’re paying for a guess.

Should you replace the furnace and AC at the same time?

Often, yes, especially in WDM homes built in the 2000s and early 2010s where both pieces of equipment are original. Here’s the math:

Approach	What you pay	What to know
Furnace now, AC later	$4,000–$9,000 now, then $4,500–$8,500 when the AC fails	Two installs, two permits, and the coil on top of the new furnace may have to be replaced again with the AC
Furnace and AC together	Roughly $8,500–$17,500 combined, before add-ons	One install, matched equipment, warranties that start the same day

Planning ranges for the Des Moines metro in 2026; your written quote depends on the equipment, access and what we find on site.

The combined number is just the two ranges added together. Doing both at once usually comes in under the cost of two separate jobs, because there’s one setup, one permit and one round of coil and line-set work instead of two.

There’s also a refrigerant reason. New central air systems installed now use newer refrigerants such as R-454B instead of the R-410A most existing systems run on. If you replace only the furnace and keep an older AC, the coil sitting on that new furnace has to stay matched to the old system. When the AC dies a few years later, that coil usually gets replaced anyway.

A simple rule: if your AC is past about 12 years old or has had refrigerant leaks, price both together. If it’s under about 8 years old and healthy, replacing just the furnace is reasonable.

Pro tip: For any furnace and AC pairing, ask for the AHRI certificate number. It confirms the efficiency rating of that exact equipment combination, and rebate programs often ask for it. Check MidAmerican Energy’s current rebate programs before you sign. Don’t count on a federal tax credit; those ended for equipment installed after 2025.

Should you repair the furnace or replace it?

Most furnace repairs run $150–$800. If your furnace is under 15 years old and needs an ignitor, flame sensor or inducer motor, repair usually makes sense. If it’s closer to 20, needs a repair near the top of that range, or has a confirmed cracked heat exchanger, the money is better spent on a replacement. Our post on 7 signs your furnace is dying covers the warning signs in detail. If yours simply won’t light, start with our furnace troubleshooting checklist, and if you want an honest read on its condition before deciding, a fall tune-up is the right time to get one.

How long does it take, and when should you call?

Most like-for-like swaps take a day; a high-efficiency conversion with new venting, or a furnace and AC together, can run a little longer. The best time to replace is before you have to, in fall or late spring. A furnace that dies in January means taking whatever equipment is in stock.

There’s nothing DIY about a furnace install: it involves gas, venting, line-voltage wiring and combustion testing. What you can do is gather the age on the rating plate, a year of gas bills, and notes on which rooms are uncomfortable. That makes the quote more accurate.

For a written quote in West Des Moines, call (515) 494-5483. Quotes are upfront and in writing, financing is available on jobs over $500 with approved credit, and there’s a military discount for active, retired and veteran service members. You can also read more about our furnace replacement and repair and AC service.