When it's time for a new AC system
Not every AC problem needs a new system. We repair more units than we replace, and we'll always tell you if a repair makes more sense. But there are situations where replacement is the honest answer. If your system is 15 or more years old, you're past the expected lifespan. Parts become harder to find. Efficiency drops every year. What used to cool your house on $120/month of CORE Electric now costs $180.
If your system uses R-22 refrigerant, that's an even clearer signal. R-22 was phased out of production in 2020. A pound of R-22 now costs $100 or more, and a typical recharge needs 3–5 pounds. At $300–$500 per recharge, and with the leak that caused the loss still there, you're throwing money away every season.
Other signs: repair costs exceeding 50% of replacement value, uneven cooling with hot and cold rooms, the system running constantly without reaching the set temperature, or breakdowns more than once per summer. Many homes in The Meadows and Founders Village were built in the early 2000s and early 2010s with builder-grade 13 SEER units that are now reaching end of life. Newer construction in Terrain and Crystal Valley Ranch has more efficient equipment, but some early builds in those developments already have 10-year-old systems showing their age.
If you're not sure whether to repair or replace, call us at (720) 636-0188. We'll look at the system, give you the math on both options, and let you decide. No pressure. If repair is the better call, we'll say so. Schedule regular AC maintenance to extend the life of whatever system you have.
How we size your new system
Most HVAC companies skip the sizing calculation. They look at the old unit, match the tonnage, and install. That's how you end up with an oversized system that short cycles, wastes energy, and can't control humidity. Or an undersized system that runs nonstop and still can't keep up when Castle Rock hits 95°F in July.
We do a Manual J load calculation on every installation. That's the engineering standard for sizing residential HVAC. We measure your home's square footage, insulation values, window area and orientation, ductwork condition, and number of occupants. Then we factor in Castle Rock's specific climate conditions: Climate Zone 5B, 6,200-foot altitude, low humidity, intense UV exposure, and 40-degree day-to-night temperature swings that stress equipment differently than lower elevations.
The result is a system sized exactly for your home. Not too big, not too small. It runs efficiently, controls humidity properly, and keeps every room within 2–3 degrees of the thermostat setting. That's how a properly sized system should work.
Get a straight answer on what you actually need.
No commissioned salespeople. No inflated quotes. Call us and we'll tell you exactly what your Castle Rock home needs and what it costs.
Call (720) 636-0188No diagnostic fees. No voicemail. A real person answers.
What a new AC system costs in Castle Rock
We're going to be direct about pricing because most companies won't. Entry level: $4,500–$6,500. That gets you a 14 SEER2, single-stage system. It's builder grade — the same kind originally installed in most Castle Rock homes. It works. It cools. It's reliable. If budget is the priority, this is a solid choice.
Mid-range: $6,500–$9,000. A 16 SEER2, two-stage system. Better humidity control, quieter operation, lower monthly bills. The two-stage compressor runs at a lower speed most of the time and ramps up only on the hottest days. This is what we install most often in Castle Rock because it balances cost, efficiency, and comfort.
Premium: $9,000–$14,000. An 18+ SEER2, variable-speed system. Whisper quiet. Maximum efficiency. The compressor adjusts continuously to match the exact cooling load. These systems can cut your cooling costs by 40–50% compared to a 15-year-old unit. Popular in Castle Pines Village and the larger homes in Crystal Valley Ranch.
Your CORE Electric bill will drop $30–$80/month with a new high-efficiency system compared to a 15-year-old unit. Over 10 years, that's $3,600–$9,600 back in your pocket. Factor that into the purchase price when comparing options.
Brands we install in Castle Rock
Trane, Carrier, Lennox, Rheem, Goodman, Daikin, American Standard. We're not locked into one brand. Some companies are — they're dealers for a single manufacturer and that's all they'll quote you, regardless of whether it's the best fit. We recommend based on your budget, your home's ductwork capacity, and what performs best in Castle Rock's climate. If a $5,000 Goodman is the right call for your house, we'll tell you that instead of pushing a $10,000 system you don't need. If your current system just needs a fix instead of replacement, check out common reasons your AC isn't cooling.
Frequently Asked Questions
Get a free installation estimate. Call now.
We'll come to your Castle Rock home, measure everything, calculate the load, and give you options with clear pricing. No obligation.
(720) 636-018824/7 emergency line · No diagnostic fees · Same-day service