Prices for a Dedicated Outdoor Air System (DOAS) vary by building size, system type, and installation complexity. The latest pricing typically ranges from a low to high that reflects scope, equipment quality, and regional labor. This article presents cost figures in USD with clear low-average-high ranges and describes the main price drivers for DOAS projects.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Equipment | $8,000 | $18,000 | $40,000 | DOAS unit, heat recovery module, coil, filters |
| Installation/Labor | $6,000 | $12,000 | $25,000 | Design, mounting, wiring, integration |
| Ductwork & Diffusers | $4,000 | $10,000 | $20,000 | Supply and return runs, diffusers |
| Controls & Commissioning | $2,000 | $6,000 | $12,000 | BMS integration, sensors, tuning |
| Permits & Inspections | $500 | $2,000 | $5,000 | Local code approvals |
| Delivery/Removal & Disposal | $500 | $1,500 | $5,000 | Equipment transport, old unit removal |
| Warranty & Aftercare | $500 | $1,500 | $4,000 | Parts and service coverage |
Assumptions: Midwest labor rates, standard DOAS configurations, single-zone or simple multi-zone integration, typical ceiling heights, and standard filtration.
What You Should Pay for a DOAS Based on Building Size and Use
Total price often scales with square footage and ventilation requirements. For small offices around 2,000 square feet, a DOAS may run roughly $15,000-$40,000, including equipment, installation, and basic control wiring. Medium spaces around 6,000-10,000 square feet commonly fall in the $25,000-$70,000 range, with higher-end units and extensive ductwork pushing toward $90,000 or more. Large facilities over 20,000 square feet frequently exceed $100,000 when full integration with existing systems is needed.
Major Cost Components in a DOAS Quote
Quotes typically break out four to six key areas. The table below shows common cost drivers and realistic ranges.
| Cost Component | Low | Average | High | Notes |
|---|---|---|---|---|
| Equipment | $8,000 | $18,000 | $40,000 | DOAS unit, heat exchanger, fresh-air damper |
| Labor | $6,000 | $12,000 | $25,000 | On-site assembly, wiring, calibration |
| Ductwork | $4,000 | $10,000 | $20,000 | Fittings, sealing, insulation |
| Controls | $2,000 | $6,000 | $12,000 | Sensors, BMS interface, programming |
| Permits | $500 | $2,000 | $5,000 | Code compliance, inspections |
| Delivery/Disposal | $500 | $1,500 | $5,000 | Transportation, decommissioning old unit |
Assumptions: Standard-height ceilings, single- or dual-zone control, access restrictions, and typical refrigerant handling.
Which Variables Most Move the Final DOAS Quote
Two numeric thresholds commonly tilt prices. First, air-change requirements or outdoor-air fraction often scale unit size; more outdoor air means a larger footprint and higher coil and fan power. Second, the number of zones or independent controls increases control hardware and commissioning time. For example, moving from a single-zone to a two-zone DOAS can add 15-30% to equipment and labor costs.
Other drivers include building height, duct routing complexity, and integration with existing controls. Assumptions: urban site with standard access, typical electrical capacity, and moderate ceiling height.
Practical Ways to Trim DOAS Costs Without Sacrificing Performance
Control scope to avoid overdesign, reuse existing ductwork where feasible, and select standard filter and coil configurations. Choosing a mid-range DOAS unit rather than premium models can still meet ventilation and energy goals. Staging installation and coordinating with other trades can reduce labor hours and scheduling impacts.
Assumptions: moderate project timeline, no major structural work, standard delivery windows.
Pricing Scenarios: Small Commercial vs Large Office DOAS Configurations
In a 2,000 square foot small office, expect a DOAS price around $15,000-$40,000. For a mid-size 6,000-8,000 square foot office, ranges extend to $25,000-$70,000. Large multi-tenant offices over 20,000 square feet with complex zoning can exceed $100,000, especially if energy recovery wheels and advanced demand-controlled ventilation are included.
Assumptions: typical ceiling heights, standard HVAC cabinets, and regional labor variation accounted for in the averages.
Regional Price Deltas and How They Show Up in the Quote
Coastline markets or urban cores may show higher labor and permitting costs, while suburban or rural projects can be more affordable. In some regions, DOAS equipment costs can vary by 10-20% due to supply chains or local incentives. Negotiating bundled work with other HVAC renovations can yield additional savings in high-demand periods.
Assumptions: regional labor rates reflect typical metropolitan without rush schedules.
How to Read a DOAS Quote: Per-Unit and Total Price Signals
Look for per-unit pricing for the DOAS module, per-ton cooling capacity, and per-zone control counts. A compact DOAS may include a smaller per-ton rate but higher installation complexity. Compare total price across quotes to understand the impact of labor hours and control integration. Always check for hidden charges in permits or disposal.
Assumptions: standard unit sizing based on calculated ventilation load.