A typical HVAC replacement quote in 2026 is a single-page PDF or a three-page email. It runs $12,000 – $28,000 for a Front Range home. And roughly half of the homeowners who show us a competing quote before signing didn't understand what half the line items meant — often for reasons that had nothing to do with the customer and everything to do with a quote that was written to be signed, not to be read.
This is the vocabulary. Everything below is what should be on a legitimate quote for a full HVAC replacement in Douglas County. If your quote is missing several of these, that's a fixable red flag, and the second opinion below is designed for exactly this conversation.
1. The AHRI certificate reference
The single most important line item. AHRI — the Air-Conditioning, Heating & Refrigeration Institute — publishes a certificate for every tested matched pair of indoor + outdoor equipment. The AHRI reference number specifies exactly what equipment combination was tested and what its certified capacity, SEER2, HSPF2, and EER2 numbers are.
If your quote lists an outdoor model number and an indoor model number but no AHRI reference, the efficiency numbers on the quote are theoretical — they haven't been verified for the pairing you're actually buying. Ask for the reference. If it can't be produced within 24 hours, that's a serious signal.
2. Equipment: matched, listed, and specific
A legitimate quote lists:
- Outdoor condenser make, model, and tonnage.
- Indoor coil make, model, and configuration.
- For heat pumps: matching ENERGY STAR Cold Climate Heat Pump (CCHP) listing status.
- Furnace (or air handler) make, model, and stage count (single / two / variable).
- SEER2, HSPF2, EER2, AFUE — the specific numbers for the matched pair per the AHRI cert.
- Refrigerant type (R-410A on legacy systems, R-454B on new 2025+ installs).
"3-ton system" or "high-efficiency furnace" are marketing terms, not specifications. A specification includes model numbers.
3. Manual J load calculation
Full-replacement quotes should reference (and ideally attach) the ACCA Manual J load calc that anchored the sizing. See why this matters at 6,200 feet. If it's absent, the sizing was done by shortcut, and there's a 30 – 40 % chance the recommended tonnage is wrong.
4. Ductwork evaluation
A quote should reference Manual D duct-sizing verification and static-pressure measurement. If the ductwork requires modification for the new equipment, that scope and cost should be broken out separately — not folded into the equipment price. A quote that says "ductwork included" without specifying what was measured is either optimistic or evasive.
5. Permits and inspections
Full HVAC replacements in Douglas County (and every Front Range jurisdiction we've worked in) require a mechanical permit and a final inspection. If gas is involved, a gas-line permit. If refrigerant is involved and the outdoor pad or lineset is modified, a mechanical permit covers it. The permit fees ($150 – $400 typically) should be a line item, and the quote should state who pulls the permit (the licensed contractor — not you).
A quote that's materially cheaper than others and lists no permits is frequently cheaper for exactly that reason. An unpermitted install fails your resale disclosure and can complicate a homeowner's insurance claim.
Every permitted install is also inspected. That inspection is your insurance policy that the work was done right — and it's the reason a legitimate contractor wants the permit as much as the code enforces it.
6. Commissioning tasks
Commissioning is what happens at the end of the install: the tech verifies that the new equipment is actually running to spec before leaving. On a legitimate quote, commissioning includes:
- Refrigerant charge verification — measured superheat and subcool with the manufacturer's high-elevation derating table applied.
- Combustion analysis (for gas furnaces) — measured O2, CO, and stack temperature with a calibrated analyzer, tuned per the manufacturer's high-elevation spec.
- Static-pressure measurement at the plenum, verified against the Manual D target.
- Airflow (cfm) verification per room if a full commissioning report is included.
- Written commissioning report handed to the homeowner at end of install.
Quotes that skip combustion analysis or refrigerant-charge verification at high elevation are the reason for a lot of "why is my brand-new system underperforming?" service calls in year one. Ask for it in writing.
7. Warranty terms
Two warranties to separate:
- Parts warranty. Manufacturer-provided, typically 10 – 12 years on registered equipment. The manufacturer covers replacement parts if they fail; you or your contractor pay the labor to install them.
- Labor warranty. Contractor-provided, typically 2 years (industry-normal), sometimes 5 – 10 years. Covers the cost of the technician's time to install a warranty part.
A 10-year labor warranty is exceptional and worth asking about — Colorado Bear installs come with one. Ask if it's transferable at sale (ours is). Ask if it covers refrigerant labor (ours does).
8. Rebate math shown clearly
A quote should list gross cost, each applicable incentive as a separate line, and the net-to-you number at the bottom. On qualifying heat-pump installs in Xcel Colorado territory, that stack includes:
- The Xcel heat-pump rebate (deducted at install).
- The Colorado SB23-016 state credit ($1,500 in 2026, verify).
- The federal 25C tax credit (30 % of installed cost up to $2,000).
A quote that omits the rebate stack or lists it as "rebate — apply yourself" is passing $3,000 – $7,000 of paperwork risk to you. That's often the specific line item making a quote look cheap that isn't.
Six phrases to slow down on
- "Today-only pricing." Legitimate HVAC contractors don't need urgency tactics. A fair quote should be good for 30 days at minimum.
- "Rebate not guaranteed — apply yourself." The Xcel and Colorado state credits are filed by the contractor. If they're passing this to you, they're either not registered or don't want to do the paperwork.
- "Sized to match your existing unit." The existing unit is often oversized. Matching it perpetuates the problem. A proper quote references a fresh Manual J.
- "Refrigerant additional at time of install." Refrigerant is part of a full replacement quote. Charging separately is either a bait-and-switch or a sign the tech isn't confident on charge quantity.
- "Combustion analysis extra." On gas furnace installs at Front Range elevation, combustion analysis is mandatory commissioning — not an add-on. Any quote treating it as optional is skipping a safety-critical step.
- "Verbal warranty; call for terms." Warranties in writing. Every time.
What fair pricing looks like in 2026
Rough gross install ranges for Castle Rock full replacements in 2026, before any rebate math:
- Basic 2.5 – 3 ton AC + high-efficiency gas furnace replacement: $11,000 – $16,000
- Standard 3 – 3.5 ton heat pump replacement (all-electric): $14,000 – $22,000
- Dual-fuel install (heat pump + new or existing high-eff furnace): $15,000 – $24,000
- Full envelope + duct modification + electrical upgrades: $22,000 – $35,000
Bigger or more complex homes go higher. Smaller / simpler homes go lower. A quote that's more than 25 % above or below the range for your equipment and scope deserves a second look.
What to do with a quote you're unsure about
Bring it to a Free 2nd Opinion. We walk your existing quote line-by-line against the AHRI listings, measure duct static, verify combustion or refrigerant status where relevant, and leave you with a written second opinion annotated on your existing quote. We don't leave a competing quote on the table unless you ask for one.
Roughly a quarter of the second opinions we run come back "this quote is priced fairly, sign it." That's the honest baseline — and it's why the offer works as a marketing model without predatory tactics on either side.
A well-written HVAC quote is a piece of engineering documentation, not a sales sheet. The one you're about to sign should read like one.