Central air conditioning installation in the Denver Metro typically costs $3,200 – $13,000 depending on system size, efficiency rating, and installation complexity. Includes equipment and labor.
Updated April 2026 · Based on actual Denver Metro installs · On Time Heat & Air
AC units are sized in tons (1 ton = 12,000 BTU/hour of cooling). The right size depends on your home's square footage, insulation, windows, and number of floors. Colorado's altitude and dry climate also factor in — systems here work differently than at sea level. On Time Heat & Air sizes every system using Manual J load calculations, not guesswork.
| AC Size | Home Size (sq ft) | 14 SEER (Basic) | 16 SEER (Mid) | 20+ SEER (Premium) |
|---|---|---|---|---|
| 1.5 Ton | 600 – 1,000 | $3,200 – $4,000 | $4,200 – $5,200 | $6,500 – $8,000 |
| 2 Ton | 1,000 – 1,300 | $3,500 – $4,500 | $4,500 – $5,800 | $7,000 – $8,800 |
| 2.5 Ton | 1,300 – 1,700 | $3,800 – $4,800 | $5,000 – $6,200 | $7,500 – $9,500 |
| 3 Ton ★ | 1,700 – 2,100 | $4,000 – $5,200 | $5,500 – $7,000 | $8,000 – $10,500 |
| 3.5 Ton | 2,100 – 2,400 | $4,500 – $5,800 | $6,000 – $7,500 | $8,500 – $11,000 |
| 4 Ton | 2,400 – 2,800 | $5,000 – $6,500 | $6,500 – $8,000 | $9,000 – $12,000 |
| 5 Ton | 2,800 – 3,500 | $5,500 – $7,200 | $7,000 – $9,000 | $10,000 – $13,000 |
★ 3 Ton is the most common size for Denver Metro homes (1,700–2,100 sq ft). Prices include equipment and installation labor.
AC systems come in three compressor types. Higher-tier systems cost more upfront but use less electricity and keep your home more comfortable. Here's how they compare for Denver homes:
Denver sits at 5,280 feet. Brighton, where we're based, is at 4,984 feet. That altitude changes how your AC system performs — and how it needs to be installed.
Thinner air at altitude reduces cooling efficiency by about 3-5% compared to sea level. Compressors work differently. Refrigerant pressures change. An AC system sized with a sea-level rule of thumb will underperform in a Colorado home. That's why On Time Heat & Air runs Manual J load calculations on every install — we account for altitude, insulation, window exposure, and the specific layout of your home.
Colorado's dry heat is actually easier on AC systems than humid climates. Your unit doesn't have to work as hard to remove moisture. That means a mid-efficiency 16 SEER system here often performs as well as a higher-rated unit in Houston or Miami — giving you a better return on a two-stage system rather than needing to jump to variable-speed.
We also deal with intense UV exposure and hail. We position outdoor condensers on the north or east side of the home when possible and recommend hail guards for all new installations.
Depending on your home's current setup, your AC installation may require additional work beyond the unit itself. We include these in your free estimate — no surprises after the job starts.
| Additional Work | Typical Cost | When It's Needed |
|---|---|---|
| Electrical circuit (230V) | $500 – $2,000 | If your panel lacks a dedicated 230V breaker for the condenser |
| Copper lineset | $200 – $700 | New refrigerant line from condenser to evaporator coil |
| Indoor evaporator coil | $500 – $1,500 | If your furnace doesn't have a compatible coil |
| Thermostat wiring | $100 – $500 | If you need a new C-wire or low-voltage wiring upgrade |
| Ductwork modification | $200 – $800 | If existing ducts need resizing or repair |
| Concrete pad | $100 – $300 | Level pad for outdoor condenser unit |
| Hail guard | $50 – $150 | Recommended for all Colorado installations |
Replacing your AC and furnace at the same time saves on labor and ensures the systems are properly matched for efficiency. Here's what combo packages typically cost for an average Denver Metro home (1,700–2,500 sq ft):
3-ton 14 SEER AC + 80% AFUE furnace
Budget-friendly. Gets the job done. Best for rental properties or homes you plan to sell within 3 years.
3-ton 16 SEER AC + 96% AFUE two-stage furnace
Best value for most homeowners. Lower energy bills, quieter operation, better comfort. This is what we install most often.
3-ton 20+ SEER AC + 98% AFUE modulating furnace
Maximum efficiency. Whisper-quiet. Precise temperature control. Best for forever homes where long-term savings matter.
Before committing to a traditional AC, it's worth knowing that heat pumps provide both heating and cooling in one system — and qualify for Colorado rebates that AC-only systems don't. Here's how they compare:
For most Denver homeowners replacing an aging furnace and AC at the same time, a heat pump is worth a serious look. We install both — call us at (720) 527-0668 and we'll help you compare.
Getting the right size matters more than getting the highest efficiency. An oversized AC short-cycles — it cools fast but never removes humidity, leaving your home clammy. An undersized system runs nonstop and never catches up on hot days. Here's a general guide:
| Home Size | Cooling BTUs Needed | AC Tonnage | Typical Cost Range |
|---|---|---|---|
| Under 1,000 sq ft | 18,000 – 24,000 | 1.5 – 2 Ton | $3,200 – $5,800 |
| 1,000 – 1,700 sq ft | 24,000 – 36,000 | 2 – 2.5 Ton | $3,500 – $6,200 |
| 1,700 – 2,400 sq ft ★ | 36,000 – 42,000 | 3 – 3.5 Ton | $4,000 – $7,500 |
| 2,400 – 3,000 sq ft | 42,000 – 48,000 | 3.5 – 4 Ton | $4,500 – $8,000 |
| 3,000+ sq ft | 48,000 – 60,000 | 4 – 5 Ton | $5,000 – $13,000 |
★ Most Denver Metro homes fall in this range. These are estimates — On Time Heat & Air runs a proper Manual J calculation for every install.
Common questions about AC installation costs in Denver.
A central AC installation in the Denver Metro typically costs $3,500 to $10,500 for equipment and labor. The most common setup we install — a 3-ton, 16 SEER two-stage system — runs about $5,500 to $7,000 for an average-sized home. Exact cost depends on your home's size, existing ductwork, electrical setup, and the efficiency rating you choose.
For most Denver Metro homes, a 16 SEER two-stage system is the sweet spot. It's 15-20% more efficient than the minimum 14 SEER, runs quieter, and handles Colorado's dry heat well. Variable-speed (20+ SEER) makes sense for larger homes or if you want maximum comfort and lowest bills — but the payback period is longer here than in humid climates where AC runs all day.
Yes. At 5,000+ feet, air is thinner and AC systems lose 3-5% cooling capacity compared to sea level. Refrigerant pressures, compressor performance, and airflow all change with elevation. A system that's sized correctly for sea level will underperform here. We use Manual J calculations adjusted for altitude on every installation.
Most AC installations are completed in one day — typically 4 to 8 hours. Straightforward replacements where the ductwork and electrical are already in place take 4-5 hours. If we need to run a new electrical circuit, install a lineset, or modify ductwork, it may take a full 8-hour day. We'll give you an accurate time estimate before we start.
An AC-only system has a lower upfront cost ($3,500–$10,500 vs $7,000–$14,000 for a heat pump). However, heat pumps qualify for Colorado tax credits and utility rebates that AC systems don't — which can significantly reduce the out-of-pocket cost. If you're also replacing your furnace, a heat pump replaces both systems and often comes out cheaper after rebates.
Not necessarily, but if your furnace is over 15 years old, replacing both at the same time saves money on labor and ensures the systems are properly matched. A new high-efficiency AC paired with an old furnace won't deliver the efficiency ratings it's rated for. We inspect your furnace during every AC estimate and give you an honest recommendation.
We install major brands including Carrier, Bryant, Lennox, Trane, Goodman, and others. We're not locked into one manufacturer — we recommend the best system for your home and budget. All installations include manufacturer's warranty plus our workmanship guarantee.
Yes. We offer 0% APR financing starting from $79/month on qualifying installations. No early payoff penalties. We handle the paperwork during your estimate appointment — you'll know your monthly payment before we start the work.