AC Replacement — Firestone
AC Replacement in Firestone, CO
Nearly half of Firestone was built between 2000 and 2009, and those homes' original air conditioners are now 17 to 26 years old — the earliest of them R-22 units that full-service companies can no longer recharge. In Oak Meadows, St. Vrain Ranch and Neighbors Point, the same builder condenser went in street after street, and it is failing street after street. This guide covers what AC replacement costs in Firestone in 2026, how to tell a $600 repair from a dead unit, and what the R-22 endgame actually looks like.
Guide by Zach Barbre · Denver HVAC expert
Updated October 2026 · Written from first-hand field experience in the north Denver metro · Prices verified against 2026 Denver-metro quotes
Get a straight answer on your AC
Talk to a licensed local installer in Firestone. Free second opinions on replacement quotes — no pressure, no obligation.
Typical response time: under 15 minutes, 7am–7pm daily.
Is it the AC, or something simpler?
Before you price a replacement, rule out the cheap fixes. In our experience these cause most "air conditioner trouble" calls in Firestone:
- Clogged filter or a matted condenser coil — hose off the outdoor coil (power off first) and swap the filter before you call anyone. Cottonwood fluff chokes half the 'broken' ACs we see in June.
- Tripped breaker or blown disconnect fuse — check the electrical panel and the disconnect box by the condenser.
- Failed capacitor or contactor — a $530–$655 repair that causes most 'fan runs, no cool air' calls.
Call now, don't wait: a burning smell from the air handler, a breaker that keeps tripping, or hissing from the refrigerant lines. Those are same-day problems.
Repair or replace? The honest fork
Repair it
AC is under 10 years old, the repair is a capacitor, contactor, or fan motor, and it cools fine once fixed. Keep it running.
Replace it
15+ years old, a compressor failure, or an R-22 system needing a major recharge. At that point you're paying premium prices to keep a dying unit alive.
Rule of thumb we stand behind: if the repair costs more than about a third of a new system and the equipment is past 12 years, replacement usually wins on math alone.
What air conditioner replacement costs in Firestone (2026)
One job dominates this price range in Firestone: replacing the original builder AC in a 2000s two-story. The ductwork was designed for refrigerated air from the start and the electrical is modern, so the swap itself is clean — the real decisions are the equipment pairing and the refrigerant, because the earliest-2000s originals are R-22 systems at the end of that refrigerant's road. Newer Barefoot Lakes-era homes, by contrast, are mostly still on their first systems with years left in them.
What moves you up or down inside that range:
- Tonnage and efficiency — Most metro homes land at 2–5 tons; SEER2 rating is the biggest price lever after size.
- Refrigerant generation — An R-22 original (standard in homes built before about 2010) can no longer be recharged by most full-service companies; its replacement retires the old coil with the old condenser.
- Matched coil — The indoor coil is the same age as the condenser it serves; replacing them as a matched pair is what the warranty and the efficiency rating assume.
- Electrical — 2000s panels were built with central AC in mind; a panel surprise is rare here.
Every July, the same call repeats across Firestone: a 2007 condenser that 'just stopped' on the first 95-degree day. About half the time it's a $530–$655 capacitor — a quick fix on a system with real life left, worth doing without a second thought. The other half, it's the compressor on an R-22 unit, and that's a different conversation: no recharge path, no cheap resurrection, just replacement math. Knowing which half you're in is the entire value of the diagnostic — a $192 visit that separates a repair from a purchase. It's the same pattern one town south in Frederick, built in the same decade.
What happens when you call
- We answer and listen. You tell us the symptoms, the equipment's age, and your address. We confirm a licensed installer serves Firestone.
- A licensed local tech arrives. They diagnose, give you repair and replacement options in writing, and answer questions on the spot.
- You contract directly with the installer. The estimate, the work, and the warranty are between you and the licensed company doing the work — not with this guide.
- The installer warranties the work. Equipment warranty from the manufacturer, labor warranty from the installer, both in writing.
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.
Questions Firestone homeowners actually ask
How long does an AC replacement take?
Most straightforward swaps are one day — old condenser and coil out in the morning, cold air by evening. If electrical or ductwork needs changes, plan for two.
Our Firestone home was built in 2006 and the AC has never been replaced — what should we expect?
Expect a replacement conversation, and be skeptical of anything else. A 2006 original is a 20-year-old unit, very likely an R-22 system — and R-22 hasn't been manufactured since 2020, so most full-service companies no longer stock it for recharges. If the failure is electrical and cheap (a $530–$655 capacitor), fixing it to buy a season is reasonable. A compressor or coil failure on that unit is the end: put the money toward a matched replacement instead.
Do I need a permit for this in Firestone?
Yes — a AC replacement in Firestone requires a permit from the Town of Firestone, and the contractor you hire is responsible for pulling it and completing the inspections, which the town handles through SAFEbuilt, its private building inspection partner. A permitted mechanical replacement also triggers Colorado's carbon monoxide rule (C.R.S. § 38-45-102): an operational CO alarm within 15 feet of the entrance to each bedroom. You can verify a permit was issued by calling the town's Planning & Development department at 303-833-3291.
What size AC does my house need?
It depends on square footage, insulation, and windows — not on what was there before. A proper installer runs a Manual J load calculation. 'Same size as the old one' without measuring is a red flag.
Get a straight answer on your AC
Talk to a licensed local installer in Firestone. Free second opinions on replacement quotes — no pressure, no obligation.
Typical response time: under 15 minutes, 7am–7pm daily.