Case Study: Residential AC Upgrade Near Seymour Smith Park, Ralston
This case study documents a planned AC upgrade for a 1968 ranch home in the Ralston residential area near Seymour Smith Park (the 96-acre Omaha city park on Q Street that adjoins the Ralston border, featuring softball complexes, walking trails, and dog park). The customer’s 17-year-old R-410A AC had reached end-of-life with developing efficiency concerns; planned replacement allowed transition to current A2L refrigerant standards and substantial efficiency improvement. Total project cost $6,200 with $400 OPPD rebate producing $5,800 net cost.
Customer Situation
The property is a 1968 ranch home in Ralston near the Seymour Smith Park area (south of Q Street near the park boundary), 1,650 sq ft on a 7,800 sq ft lot. The customers (couple in their late 50s with adult children no longer living at home, both employed in office positions with standard business hours) had owned the home for 22 years (purchased 2003). They had completed periodic upgrades including a 2018 furnace replacement (Lennox EL296V two-stage, 7 years old, operating excellently).
AC situation prompting upgrade:
- 2008 Lennox 14 SEER R-410A AC, 3 ton (17 years old, beyond average AC lifespan)
- Equipment still functional but with multiple developing issues observed during May maintenance plan tune-up
- Capacitor measuring 32 microfarads (below acceptable range; rated 40)
- Contactor with substantial pitting suggesting approaching end-of-life
- Compressor amperage slightly elevated suggesting developing inefficiency
- Refrigerant level adequate but customer reports diminished cooling effectiveness over recent seasons
Diagnostic Assessment
Consultation by Krystal Bauer (IAQ Lead with substantial cooling expertise). Assessment time approximately 75 minutes including detailed equipment evaluation and customer discussion of options during May maintenance plan visit.
Equipment Condition Summary
- 2008 Lennox 14 SEER R-410A 3 ton AC
- 17 years old, beyond average residential AC lifespan (15-20 years typical)
- Multiple developing issues: capacitor at end-of-life, contactor with substantial pitting, compressor amperage elevated
- Realistic remaining useful life: 1-3 cooling seasons before major component failure
- Customer experiencing some efficiency degradation from aged equipment
Refrigerant Transition Discussion
R-22 to R-410A transition completed in past decade; current transition is R-410A to R-454B (or other A2L refrigerants). EPA requirements under Kigali Amendment phase down R-410A production over coming years. Key implications:
- R-410A still available for repairs but with rising cost trajectory
- New AC equipment manufactured 2025+ uses R-454B or equivalent A2L refrigerants
- Existing R-410A equipment can operate normally through useful life; refrigerant continues to be available with rising cost
- Replacement to R-454B equipment provides current standard compliance for 15-20 year equipment lifespan
Equipment Selection
Customer presented standard tier options:
- Standard tier — Lennox ML17XC1 — 16 SEER2 R-454B single-stage, 3 ton, $5,800 total
- Mid-tier — Lennox EL18XCV — 18 SEER2 R-454B two-stage, 3 ton, $6,200 total
- Premium tier — Lennox SL28XCV — 28 SEER2 R-454B variable-capacity, 3 ton, $8,800 total
Customer selected mid-tier two-stage based on cost-benefit analysis: meaningful efficiency improvement over standard tier at modest $400 premium, while existing furnace is already two-stage (matched system operation benefits).
Project Execution
Single 6-hour service visit:
- Hour 1 — R-410A refrigerant recovery to EPA Section 608 standards; old outdoor unit and evaporator coil removal
- Hour 2 — Old refrigerant line set removal (required for A2L refrigerant compatibility); new A2L-compatible line set installation
- Hour 3 — New Lennox EL18XCV outdoor unit positioning; new A2L-compatible evaporator coil installation in existing air handler; electrical connections including two-stage thermostat upgrade compatibility
- Hour 4 — R-454B refrigerant charging to manufacturer specifications; system pressure testing; leak verification across new line set
- Hour 5 — System startup and commissioning; performance testing across cooling cycle; temperature drop across evaporator verification (16°F appropriate for two-stage operation)
- Hour 6 — Two-stage thermostat replacement for compatibility with new equipment; customer walkthrough including two-stage operation explanation; maintenance plan continuation discussion
Results
- Modern A2L refrigerant equipment — R-454B compliance for 15-20 year equipment lifespan
- Cooling efficiency improvement — 18 SEER2 vs prior 14 SEER produces estimated 22% cooling efficiency improvement
- Two-stage operation — reduced first-stage capacity for most operation matches typical Omaha summer load; full second-stage available for peak heat conditions
- Matched system benefit — two-stage AC paired with existing two-stage furnace provides integrated matched system operation
- Humidity management improvement — longer steady-state two-stage cycles substantially better humidity removal vs prior single-stage cycling
- 10-year manufacturer warranty — new equipment registered for full warranty coverage
- OPPD rebate — $400 for qualifying SEER2 16+ equipment
- Customer satisfaction — subsequent summer feedback substantial: more even cooling, less humidity, quieter operation
Pricing
Total project cost: $6,200
- Lennox EL18XCV AC (3 ton, 18 SEER2, R-454B): $4,500
- A2L-compatible evaporator coil: $785
- New A2L-compatible refrigerant line set: $385
- R-410A refrigerant recovery and disposal: $165
- R-454B refrigerant charge: $185
- Two-stage thermostat (upgrade compatibility): $145
- Installation labor (6 hours): $885
- Old equipment removal and disposal: $185
- Materials and supplies: $200 (included)
- Maintenance plan customer pricing: $6,200 total
Net cost after rebate:
- Project cost: $6,200
- OPPD rebate: -$400
- Net cost: $5,800
Federal tax credit not applicable for standard AC replacement (federal Section 25C focuses on furnaces and heat pumps; standard split-system AC doesn’t qualify).
Two-Stage Matched System Performance
Two-stage AC paired with existing two-stage furnace provides matched system benefits:
- Both equipment pieces operate at reduced first-stage capacity for typical conditions
- Both step up to full capacity for extreme conditions
- Reduced cycling and extended steady-state operation for both heating and cooling
- Substantial humidity management improvement during cooling (longer cycles produce better moisture removal)
- Reduced equipment cycling extends lifespan of both furnace and AC
- Two-stage thermostat coordinates both systems for integrated operation
Lessons from This Project
- 17-year-old residential AC equipment is at typical replacement consideration point; multiple developing issues identified during maintenance plan service indicate appropriate timing
- Maintenance plan customer pricing produces meaningful pricing advantage on equipment replacement
- R-410A to R-454B refrigerant transition affects new equipment installations through 2050+; existing R-410A equipment can operate through useful life
- Mid-tier two-stage AC pairs particularly well with existing two-stage furnace for matched system operation
- Right-sized matched system equipment produces substantially better humidity management than oversized or mismatched equipment
- Standard AC equipment doesn’t qualify for federal Section 25C tax credit; only OPPD rebates available for AC-only replacement
Contact Omaha Heating and Air Conditioning
For Ralston Seymour Smith Park area AC upgrade, R-410A to R-454B refrigerant transition consultation, two-stage matched system installation, or maintenance plan equipment replacement, call our 24/7 line.
- Emergency Line (24/7): (402) 258-6703
- MUD Gas Emergency: 402-554-7777 (suspected gas leaks)
- 911: for CO detector alarms or fire/smoke situations
- Address: Lake Regency Building, 450 Regency Pkwy #370, Omaha, NE 68114
- Email: info@omahaheatingairconditioning.xyz
- City of Omaha Mechanical Contractor License: #MC-2014-08847
- EPA Section 608 Universal: #608U-2014-227841