Furnace Installation Denver

What a Denver furnace installation actually costs

Straight answer first: most Denver furnace installations run $6,300 to $8,650, and about $7,400 is the number to plan against for a standard-efficiency gas furnace with equipment and labor included.

You'll find a lower figure elsewhere. Angi's Denver page puts the average at $4,924 with a normal range of $2,914 to $6,933. Both numbers are real. The gap is what's counted — the lower one blends in small units, easy swaps, and equipment-only pricing, while the higher one reflects a complete installed job on a typical Front Range house.

Here's what size does to the price:

Furnace capacity	Rough home size	Installed cost range
40,000 BTU	up to ~1,000 sq ft	$5,650 – $8,600
60,000 BTU	~1,000–1,500 sq ft	$6,100 – $8,950
80,000 BTU	~1,500–2,000 sq ft	$6,850 – $10,100
100,000 BTU	~2,000–2,500 sq ft	$7,300 – $10,350
120,000 BTU	~2,500+ sq ft	$7,700 – $12,300

And what equipment type does to it:

Type	Installed range	The catch
Standard single-stage gas	$6,650 – $8,600	Reuses existing chimney venting
High-efficiency two-stage, 95%+ AFUE	$7,500 – $11,200	Add $899 – $1,965 for PVC flue if you're converting
Electric furnace	$6,100 – $11,200	Add $562 – $1,965 for a 220V circuit if converting from gas

What your quote should have in it

A furnace quote that's just one number at the bottom of a page isn't a quote. It's a hope. Ask for it broken out, because every one of these lines is negotiable or at least explainable:

• Equipment, normally 40–60% of the total. A standard 80% AFUE single-stage runs $2,400–$3,900. A 95%+ two-stage runs $3,550–$6,100.
• Labor, normally 25–35%. Pulling the old furnace, setting the new one, gas connections, wiring, thermostat. Typically $3,000–$6,900 depending on how awkward the space is.
• Materials, 5–15%. Venting, gas piping, sheet metal transitions, mounting hardware.
• Permit, $80–$150 in the Denver metro. The contractor pulls it.

Three things are usually not in the quote and can surprise you later: ductwork modification ($1,600–$5,550 and up), an electrical panel upgrade if you're going electric ($3,750–$7,100), and a thermostat ($150–$500). If your house needs any of them, you want to know now, not on installation day.

The Xcel rebate nobody seems to mention

Install a natural gas furnace at 95% AFUE and Xcel Energy pays a $225 rebate. A 95% boiler is also $225, and a 95% boiler paired with an indirect water heater is $325. That's straight off Xcel's own heating equipment rebate page.

We're pointing this out because at least two Denver contractor sites currently ranking for furnace searches tell homeowners the opposite — that furnace rebates ended and only heat pumps qualify now. That's not right. Xcel is reducing the heat pump bonus rebates, and somewhere in the retelling that turned into "no furnace rebates." Different program, different equipment.

It's $225. It won't decide anything on an $8,000 job. But you should get it, and you should notice when someone tells you money doesn't exist when it does.

Sizing is where Denver gets different

The rule of thumb is 30 to 60 BTUs per square foot. That's a starting point for a conversation, not an answer, and the spread between 30 and 60 is the whole ballgame on a 2,000 square foot house.

Denver adds a wrinkle most of the country doesn't have. Gas furnaces lose capacity at altitude — roughly 4% per 1,000 feet — and Denver sits above 5,200 feet. A unit sized off sea-level tables is undersized here before it's even uncrated. A contractor who knows the market derates for it without being asked.

Oversizing is the more common mistake, and it's the one that actually hurts. A furnace that's too big heats the house fast, shuts off, and starts again a few minutes later. That's short-cycling: uneven temperatures, more wear on the ignitor and blower, and a shorter life on an expensive machine. Bigger is not safer.

Permits, licensing, and who is responsible

Colorado does not issue a statewide HVAC or mechanical contractor license. The state licenses electricians, plumbers, and radon professionals — HVAC isn't on the list. That surprises people, and it's why "licensed" gets used loosely in this trade around here.

Denver is stricter than the state. The City and County of Denver licenses mechanical contractors, and a contractor's license requires holding or employing someone with a supervisor certificate. A furnace replacement requires a mechanical permit, and the contractor pulls it.

So the useful questions are specific ones: What's your Denver mechanical contractor license number? Are you pulling the permit, and is it in the quote? A pro who does this every week answers both without pausing. Anyone who suggests skipping the permit to save you a hundred dollars is telling you something about how the rest of the job will go.

When repair is the smarter money

We'd rather you not buy a furnace you don't need.

The $5,000 rule is the quick screen: multiply the repair cost by the furnace's age. Over $5,000 and replacement usually wins. A $400 repair on a 20-year-old unit is $8,000 — replace it. That same repair on a 6-year-old furnace is $2,400 — fix it and move on.

Some situations override the arithmetic. A cracked heat exchanger is a replacement conversation at nearly any age, because that's a combustion-gas problem rather than a comfort problem. And a furnace past 20 that's still heating evenly and hasn't needed a repair yet doesn't have to be replaced on schedule just because it's old.

If you're genuinely on the fence, furnace repair or replace in Denver walks the decision properly. If you already know you're replacing, furnace replacement in Denver gets into the swap itself, and the furnace installation cost guide goes deeper on pricing than this page does.

What happens when you call

You get one insured local heating professional. Not four companies buying your phone number and racing to dial it.

They come out, measure the house rather than eyeballing it, look at your existing ductwork and venting, and give you a written estimate with the lines broken out. If the honest answer is that your furnace has another few winters in it, that's what you should hear.

Call (303) 226-1486 or send the form. It's free, and there's no obligation to hire anyone.

We serve Denver and the metro — Aurora, Broomfield, Thornton, Highlands Ranch, Arvada, Parker, and Littleton. The full list is on service areas. Want to compare companies yourself first? The Denver heating contractor directory lists local operators with no rankings attached.