Denver-metro HVAC replacement, explained straight
No sales pitch. Just what a new furnace, AC, or full system actually costs in the north Denver metro in 2026, when repair still makes sense, and how to get a licensed installer who'll put it in writing.
Updated October 2026 · Independent homeowner guide — we don't install equipment
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Furnace Replacement
AC Replacement
Heating & AC System Replacement
Start with the numbers
2026 Denver HVAC cost guide
Installed price ranges for furnaces, ACs, and full systems — what moves you up or down.
How this guide works
Who runs it, how referrals work, and why you can trust the numbers.
Denver-metro homes share quirks that national advice misses. Altitude derates gas equipment — a furnace's nameplate BTU output isn't what it delivers at 5,500 feet. Our humidity is low, so an oversized AC shows up as short-cycling rather than the clammy air you'd get in Houston. And the housing stock swings wildly: 1920s bungalows, post-war ranches, 90s two-stories, and last year's new builds can sit in the same ZIP code. Every guide on this site is written against that reality, not against a national template.
How to use this guide
Most people arrive here with one of three questions, and this site answers them in order. First: what should this cost? Start with the 2026 Denver cost guide — it gives you the installed ranges for furnaces, ACs, and full systems, plus what moves you up or down inside each range. Second: what's the right call for my house? Each city-and-service page walks through repair versus replace for your situation, with an honest rule of thumb and the local details that change the answer. Third: who do I call? Use the installer checklist below before you hand anyone a deposit. Read in that order and you'll walk into every estimate already knowing what a good one looks like.
What things cost in the Denver metro
In 2026, a licensed installer in the Denver metro charges roughly $3,200–$7,800 for a furnace replacement, $3,500–$7,500 for a central AC replacement, and $7,000–$15,000 for a full matched furnace-and-AC system. Those are installed prices — equipment, labor, permit, and haul-away of the old unit. Where you land inside each range comes down to efficiency tier, the condition of your ductwork, electrical or venting work, and whether the home needs sizing corrections. The single most useful thing you can do: get three quotes that match on equipment and scope, then use our cost guide to check whether the numbers are in the right neighborhood.
Choosing an installer
Price matters, but the installer matters more. A bad install of great equipment performs worse than a good install of mid-tier equipment. Before you sign, check:
- Licensed and insured in Colorado, with a mechanical permit pulled for your city — no exceptions.
- Visits your home before quoting. Phone quotes for full replacements are guesses, not estimates.
- Sizes from a load calculation (Manual J is the standard) instead of copying the old unit's size.
- Provides exact equipment model numbers and AFUE/SEER2 ratings in writing.
- Puts warranty terms in writing — manufacturer parts plus the installer's own labor warranty, with the term stated.
- Itemizes the scope: ductwork, venting, electrical, thermostat, line set, permit, haul-away.
- Doesn't pressure you. The reputable ones expect you to get other quotes.
How this site works: Mile High HVAC Guide is an independent publisher. We don't install HVAC equipment. When you request help, we connect you with a licensed local contractor and may receive a referral fee from them. It never changes what you pay.