How Much Does a New Air Conditioner Cost in North Shore IL? (2026 Installed Ranges)
Central AC replacement cost in North Shore IL depends on system tonnage, efficiency (SEER₂), whether the indoor coil needs replacement, refrigerant type, and any electrical work required. The ranges below are complete installed costs in Lake and Cook County for 2026 — equipment, labor, permit, refrigerant charge, and haul-away — at Legendary's flat-rate pricing.
Bands for Lake and Cook County homes — not a quote. Every Legendary job is priced upfront flat-rate after we see the equipment and the home.
| Option | Typical range | Notes |
|---|---|---|
| 14 SEER₂ central AC (minimum efficiency, standard condenser) | $4,000–$6,000 | Budget replacement. Limited ComEd rebate eligibility. R-454B (A2L) or R-410A from stock. Requires matched coil assessment. |
| 16–17 SEER₂ central AC (mid-efficiency, two-stage) | $5,500–$8,000 | Good balance of cost and efficiency. ComEd rebate may apply. Noticeable comfort improvement over single-stage. |
| 18–20 SEER₂ central AC (high-efficiency, two-stage or variable-speed) | $7,000–$10,500 | Best comfort and lowest utility bills. ComEd rebate at highest tier may apply. Winnetka Electric customers: verify rebate with municipal utility. |
| Coil replacement (indoor coil only, matched to existing condenser) | $1,800–$3,500 | Required when condenser refrigerant changes (R-410A → R-454B mismatch). Verify refrigerant compatibility before replacement. |
What changes the price
- Tonnage: most North Shore homes need 2.5–4 tons; load calculation required if home has changed since original install
- SEER₂ rating: each SEER₂ point of improvement reduces cooling energy use approximately 5–7% — meaningful over a 15-year equipment life
- Refrigerant: new equipment uses R-454B (A2L) or remaining R-410A stock; coil must match condenser refrigerant
- Indoor coil condition: a mismatched or failing coil adds $1,800–$3,500 to replacement cost
- ComEd rebates for qualifying efficiency tiers — reduces net cost; Winnetka Electric: verify separately
- Permit: mechanical permit required; included in Legendary's flat-rate quotes
FAQs
- What SEER₂ is the minimum required in Illinois in 2026?
- SEER₂ 14.3 is the federal minimum for split-system central AC in the North-Central region (Illinois) as of 2023. Most replacement equipment in North Shore IL is 14.3 SEER₂ minimum; higher efficiency is available and often financially worthwhile.
- Do I need to replace both the outdoor condenser and indoor coil at the same time?
- Generally yes when the refrigerant type changes (R-410A to R-454B) or when the existing coil is more than 15 years old. Mismatched systems lose efficiency, void warranties, and may not operate correctly. Legendary assesses the indoor coil on every AC replacement quote.
- What is the ComEd rebate for a new air conditioner in 2026?
- ComEd offers tiered rebates for central AC systems meeting efficiency minimums — typically $50–$250 at standard efficiency, higher for premium SEER₂ units. Rebate amounts change annually. Winnetka Electric customers should check with the Winnetka municipal utility. Legendary identifies applicable rebates at the time of quote.
- How long does an AC installation take?
- Most central AC replacements are completed in 4–6 hours. If a new coil, additional refrigerant line work, or electrical panel work is included, the job may extend to a full day. Legendary provides a time estimate at scheduling.
Editorial provenance
Content by Legendary Service editorial team
Updated:
Methodology
Published ranges are planning bands. The final scope depends on equipment, access, permits, code requirements, and conditions confirmed during an in-home diagnosis; Legendary Service then provides an upfront flat-rate price.
Comfort, handled — across the North Shore.
Tell us what's happening at your Lake County or Cook County home. You'll get upfront flat-rate pricing, a clear explanation before work begins, and the same above-code standard we'd want in our own homes.
Licensed & Insured · 5.0★ rated · Family-owned since 2008 · 24/7 emergency dispatch