Case Study: Four-Zone HVAC Installation in West Omaha Substantial Residence
This case study documents a four-zone HVAC installation for a 2019 substantial residence in far-west Omaha (Elkhorn area), with separate equipment serving distinct zones for first floor, second floor, finished basement, and detached garage workshop. The 4,200 sq ft home with substantial occupancy variations across zones benefited from independent zone control rather than the builder’s original single-zone single-thermostat specification. Total project cost $22,800 for two communicating-system matched system installations plus zone control infrastructure across the entire property.
Customer Situation
The property is a 2019 two-story home in far-west Omaha (Elkhorn area), 4,200 sq ft main residence plus 850 sq ft detached garage with finished workshop space. The customers (couple in their early 50s with two college-age children returning home periodically) had purchased the home in 2022 and identified zone control deficiency during their first full year of occupancy. The home included builder-installed equipment (2019 Lennox EL296V furnace and Lennox EL18XCV AC) operating well, but the single-zone configuration produced substantial comfort variations across the substantial home.
Issues prompting comprehensive zone retrofit:
- First floor consistently 4-6°F warmer than second floor during cooling, opposite during heating
- Finished basement (substantially used as exercise room and entertainment space) without independent climate control
- Detached garage workshop (used for hobby woodworking) unheated and uncooled, limiting workshop use
- Master bedroom suite (second floor) particularly affected by overshooting/undershooting
- College-age children’s second-floor bedrooms occupied only during return visits, ineffective use of conditioning resources
- Customer interested in comprehensive smart-home integration
Diagnostic Assessment
Initial consultation by Jess Sandoval (Install Lead, 11 years, Manual D specialty). Assessment time approximately 3 hours including thermal evaluation, ductwork inspection, and detached garage feasibility for additional equipment.
Main Residence Assessment
- 2019 Lennox EL296V two-stage 96% AFUE furnace, 100K Btu/hr, operating well
- 2019 Lennox EL18XCV two-stage 18 SEER2 AC, 4 ton, operating well
- Existing ductwork sized for matched system, accommodation for zone control feasible
- 200-amp electrical service standard for 2019 construction
- Manual J load calculation: first floor 35K Btu, second floor 30K Btu, basement 18K Btu (total 83K consistent with 100K furnace appropriate sizing)
Detached Garage Workshop Assessment
- 850 sq ft detached garage with workshop space
- No existing climate control
- Electrical service to garage adequate for mini-split installation
- Customer’s hobby woodworking required temperature and humidity control for tools, materials, and finished work
- Sound considerations: workshop power tools produce substantial noise; quiet HVAC less critical than for residential
- Heat load: approximately 24,000 Btu/hr heating, 18,000 Btu/hr cooling
Equipment Selection
Comprehensive four-zone configuration:
Main Residence (Three Zones via Existing Equipment Plus Zone Control)
- Zone 1 (First Floor) — existing 2019 equipment, motorized supply damper, dedicated thermostat
- Zone 2 (Second Floor) — motorized supply damper, dedicated thermostat
- Zone 3 (Basement) — motorized supply damper, dedicated thermostat
- Honeywell TrueZONE HZ432 four-zone control panel
- Bypass damper — for static pressure management
- Three ecobee Smart Thermostat Premium units — one per zone
Detached Garage (Fourth Zone via Independent Mini-Split)
- Mitsubishi MUZ-GS24NA outdoor unit — 24,000 Btu/hr cooling, 30,000 Btu/hr heating
- Mitsubishi MSZ-GS24NA indoor wall-mount — standard residential wall unit
- Independent operation — separate from main residence HVAC, dedicated thermostat
- Cold-climate capability — heat pump operation to -5°F appropriate for workshop heating needs
Installation Execution
Four-day project given substantial scope:
Day 1 (8 hours) — Main residence ductwork modification: motorized damper installation in three supply branches (first floor, second floor, basement), bypass damper installation for static pressure management, return air verification across all zones.
Day 2 (6 hours) — Main residence zone control panel installation, wiring between control panel and existing furnace/AC, ecobee thermostat installation (three units), commissioning of three-zone main residence operation.
Day 3 (8 hours) — Detached garage mini-split installation: outdoor unit positioning and mounting, refrigerant line routing from garage to outdoor unit, indoor wall-mount installation, electrical work coordination for dedicated circuit, system startup and commissioning.
Day 4 (4 hours) — System integration and verification: ecobee smartphone app setup, integration with customer’s existing smart-home automation, final testing of all four zones under various operating scenarios, customer walkthrough and documentation.
Results
- Four independent zones — each zone with dedicated thermostat and independent control
- Main residence temperature differentials resolved — first/second floor differential reduced from 4-6°F to 1-2°F
- Basement climate control — independent control matches actual occupancy patterns
- Workshop usable year-round — detached garage workshop now temperature and humidity controlled, enabling hobby woodworking through all seasons
- Smart-home integration — all four zones integrated with customer’s home automation, smartphone control, scheduling, geofencing
- Energy efficiency improvement — estimated 15-20% reduction in heating/cooling energy through zone-specific operation and setback during unoccupied periods (children’s second-floor bedrooms unoccupied during semester)
- Comfort substantially improved — master bedroom suite no longer overshooting/undershooting
- OPPD heat pump rebate — $400 for the mini-split installation qualifying for heat pump category
Pricing
Total project cost: $22,800
Main Residence Zone Control: $5,800
- Honeywell TrueZONE HZ432 four-zone control panel: $585
- Three motorized supply dampers: $725
- Bypass damper: $285
- Three ecobee Smart Thermostat Premium units with room sensors: $1,185
- Ductwork modifications: $625
- Installation labor (14 hours): $1,485
- Wiring, materials, miscellaneous: $385
- Smart-home integration: $385
- Programming and commissioning: $145
Detached Garage Mini-Split Installation: $17,000
- Mitsubishi MUZ-GS24NA outdoor + MSZ-GS24NA indoor: $4,485
- Refrigerant line set and routing (substantial distance from house to garage): $885
- Electrical contractor coordination (dedicated 240V circuit to garage): $1,485
- Installation labor (8 hours): $885
- Mounting hardware, condensate management: $385
- Insulation upgrades in workshop space (recommended for HVAC efficiency): $8,485
- Customer-elected workshop upgrades: $295
Net cost after rebates:
- Project cost: $22,800
- OPPD heat pump rebate: -$400
- Federal Section 25C tax credit (qualifying heat pump): -$2,000
- Net cost: $20,400
Customer Use Patterns Post-Installation
- First floor maintains comfortable temperatures during family gathering spaces use
- Second floor zones independently controlled; children’s bedrooms set back during semester (away at college), brought to setpoint when they return
- Basement zone independently controlled based on exercise/entertainment use patterns
- Workshop maintains 65°F heating setpoint during winter, allowing year-round hobby woodworking; cooling during summer prevents tool corrosion
- Geofencing automatically adjusts all four zones when customers leave/return
- Smartphone monitoring identifies any comfort issues remotely
Lessons from This Project
- Substantial properties benefit substantially from multi-zone HVAC configuration matching actual occupancy patterns
- Existing functional equipment can support zone retrofit without replacement; substantial cost savings vs full new installation
- Two-stage equipment works particularly well with zone control because reduced first-stage capacity matches single-zone load
- Detached spaces (workshops, guest cottages) often benefit from independent mini-split installation rather than ductwork extension
- Smart-home integration adds substantial value beyond traditional programmable thermostats
- Federal Section 25C tax credit covers qualifying heat pump installations even when integrated with broader HVAC project
Contact Omaha Heating and Air Conditioning
For West Omaha multi-zone HVAC installation, substantial residence consultation, workshop or detached space climate control, or smart-home integration, call our 24/7 line.
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- 911: for CO detector alarms or fire/smoke situations
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- Email: info@omahaheatingairconditioning.xyz
- City of Omaha Mechanical Contractor License: #MC-2014-08847
- EPA Section 608 Universal: #608U-2014-227841