An ERV installation quote should include the ERV core, dedicated exterior intake and exhaust caps, insulated duct runs, fittings, dampers, controls, electrical work, labor, and final balancing. The core unit is only one part of the project. Installation becomes more expensive when duct runs are long, access is difficult, multiple floors are involved, or the system must connect to existing HVAC ductwork. Compare quotes by airflow capacity, duct design, control features, commissioning procedures, and warranty support rather than by equipment price alone.
What drives ERV installation cost?
ERV installation cost is determined by the complete ventilation system, not just the box mounted in a utility room or mechanical closet. A professional quote should account for the energy recovery core, exterior wall caps, ductwork, supports, insulation, dampers, controls, electrical connections, labor, and startup testing.
The main cost variables are:
- Equipment capacity and features: Larger airflow capacity, variable-speed fans, filtration, frost protection, and advanced controls can change the equipment allowance.
- Duct routing: Short, direct runs are generally simpler than long runs through finished ceilings, attics, crawlspaces, or multiple floors.
- Exterior penetrations: Intake and exhaust openings may require careful layout, weather sealing, flashing, and protection from snow, debris, and recirculation.
- System configuration: A dedicated duct system may require more duct material but can provide more predictable airflow than tying the ERV into existing HVAC ducts.
- Access and finish work: Opening and repairing drywall, framing around penetrations, moving stored items, or working in a tight attic can add labor.
- Commissioning: Airflow measurement and damper adjustment are necessary to verify that the installed system performs as intended.
Because labor and local construction conditions vary, a national price estimate can be misleading. Request an itemized local proposal instead of evaluating the ERV by its equipment price alone.
ERV versus HRV core unit pricing
An ERV, or energy recovery ventilator, transfers heat and some moisture between outgoing and incoming air streams. An HRV, or heat recovery ventilator, transfers heat but is designed without the same moisture-transfer function. Both can reduce ventilation energy losses, but they are not interchangeable for every home.
| Consideration | ERV | HRV |
|---|---|---|
| Heat transfer | Yes | Yes |
| Moisture transfer | Yes, subject to the core design and operating conditions | Generally no intentional moisture transfer |
| Common planning concern | Managing indoor humidity while ventilating | Removing indoor moisture without returning moisture through the core |
| Best selection basis | Climate, indoor humidity, building tightness, and manufacturer guidance | Climate, indoor humidity, building tightness, and manufacturer guidance |
There is no universal rule that an ERV is always better or that an HRV is always less expensive to install. The core unit is only one portion of the total project. A less expensive unit can still produce a more expensive installation if it requires different controls, larger ducts, additional adapters, or a more difficult layout.
Ask the contractor to document the design airflow, fan operating modes, filter access, condensate provisions if applicable, freeze protection strategy, and control compatibility. The manufacturer installation instructions govern product-specific requirements, while local mechanical, electrical, and building rules govern the permitted installation.
Dedicated intake and exhaust wall caps
An ERV normally needs two separate outdoor air connections: one for incoming outdoor air and one for stale air leaving the home. These openings should be planned as part of the ventilation design, not added wherever a hole is easiest to drill.
The intake cap should be located where it is less likely to draw in vehicle exhaust, dryer exhaust, plumbing vent discharge, combustion products, dust, or other contaminants. The exhaust cap should be arranged so discharged air is not immediately pulled back into the intake. Exact separation, clearance, height, and termination requirements can vary by adopted code, local amendments, product instructions, and the surrounding building conditions.
Have the installer verify the following before cutting the wall:
- Exterior cladding type and required weatherproofing method
- Stud, rim-joist, masonry, and utility locations
- Potential interference with windows, doors, soffits, roof overhangs, and other terminations
- Clearance from pollutant sources and openings, as required by the applicable rules
- Whether the caps include backdraft protection, screens, hoods, or other product-specific components
- How water will be shed from the penetration and sealed against air leakage
Dedicated caps usually create a more transparent scope than improvised connections. The quote should identify the cap models or approved product type, wall construction, flashing or sealant method, and interior finish work. A building department or mechanical official can confirm locally applicable termination and permit requirements.
Insulated flex duct and duct integration
Outdoor air ducts should be selected and installed to limit condensation, heat gain or loss, leakage, and airflow resistance. In many residential installations, insulated flexible duct is used for portions of the route, but the exact duct type, insulation level, vapor control, support spacing, and maximum length should follow the applicable code, manufacturer instructions, and project design.
Flexible duct performs best when it is fully extended, supported, and routed with broad bends. Excess slack, sharp turns, compression, and unsupported sections increase resistance and can reduce delivered airflow. The installer should also protect the duct from crushing during later attic or crawlspace work.
A useful ERV duct plan identifies:
- Outdoor air intake path from the wall cap to the ERV
- Stale-air exhaust path from the ERV to the exterior cap
- Supply-air path to the living space
- Return-air path from stale areas, if the design uses a central return arrangement
- Duct diameter, material, insulation, fittings, and approximate length
- Access panels or service clearances for filters, cores, fans, and drains if required
There are two common integration strategies. A dedicated duct system distributes fresh air to selected rooms and collects stale air from bathrooms, hallways, or other planned locations. A central-fan-integrated arrangement connects the ERV to existing HVAC ductwork. The second approach can reduce the number of new distribution ducts, but it requires careful review of airflow, fan operation, pressure, dampers, and control sequences. Existing HVAC ducts should not be assumed to be suitable without a design review.
Do not let a contractor describe a long, uninsulated outdoor-air run as equivalent to a properly insulated run. The quote should state which duct sections are outdoors, in unconditioned space, or inside the thermal envelope, and how each section will be insulated and sealed.
Balance damper calibration and commissioning
Balancing is the process of measuring and adjusting airflow so the ERV delivers and removes the intended amount of air at each terminal or branch. This matters because a system can sound as though it is operating while still providing too little ventilation in one area and too much in another.
Balancing dampers are typically installed in branch ducts or near distribution points. The exact damper locations depend on the design. A damper that is fully open is not automatically correctly adjusted, and a visual inspection cannot verify airflow.
A proper startup process should include:
- Inspect the ductwork, caps, filters, connections, insulation, and access clearances.
- Confirm that the ERV is configured for the intended voltage, controls, fan modes, and operating schedule.
- Run the system at the specified test condition.
- Measure airflow at relevant supply, return, intake, and exhaust points with appropriate test equipment.
- Adjust balancing dampers and fan settings within the manufacturer-approved range.
- Check that intake and exhaust airflow are appropriate for the design and that doors or pressure-sensitive areas are not adversely affected.
- Record final readings, settings, deficiencies, and homeowner control instructions.
Ask whether balancing is included in the base proposal or treated as an optional add-on. A low bid that excludes testing may not be comparable to a bid that includes documented commissioning. If the project is part of a larger high-performance home or an energy certification program, additional testing or documentation may apply.
Smart control integration
Smart control integration can range from a manufacturer wall control with timed boost settings to a broader home automation connection. The controls must be compatible with the ERV, and compatibility should be confirmed before wiring or purchasing equipment.
Useful control functions may include:
- Continuous low-speed ventilation
- Higher airflow during bathing, cooking, or periods of elevated occupancy
- Timed boost operation
- Outdoor temperature or humidity response
- Filter-change reminders
- Remote status and fault notifications
- Interlocks with exhaust fans, heating equipment, or home automation systems
A smart thermostat is not automatically a suitable ERV controller. Some ERVs use proprietary low-voltage controls, while others accept a dry contact, relay, or communication connection. The installer should identify the control terminals, required transformer or relay, wiring path, programming method, and failure behavior from the product documentation.
Adding controls after installation can be more expensive than planning them with the duct and electrical work. Put the requested operating modes in the scope, including who supplies the control, who configures it, and whether homeowner training is included. Electrical work may require a separate licensed trade or permit depending on local rules.
How to compare ERV installation quotes
Compare proposals by the complete system scope rather than by the ERV model number alone. Two contractors may quote similar equipment but very different duct routes, wall-cap products, balancing procedures, or finish responsibilities.
Use this checklist when reviewing bids:
- ERV or HRV model, airflow capacity, efficiency information, and warranty terms
- Number and location of exterior intake and exhaust caps
- Duct sizes, materials, insulation, approximate lengths, and route
- Dedicated distribution ducts or connection to existing HVAC ducts
- Manual balancing dampers and final airflow testing
- Electrical circuit, disconnect or service requirements, control wiring, and programming
- Framing, drywall, siding, masonry, flashing, sealant, and paint responsibilities
- Permit allowances and responsibility for inspections, if required
- Filter access, maintenance access, condensate handling if applicable, and homeowner training
- Startup documentation, warranty registration, and correction of failed commissioning results
Before signing, ask the contractor to identify assumptions and exclusions. Examples include concealed damage, asbestos or lead-related work, difficult drilling, structural repairs, HVAC modifications, electrical upgrades, and finish repairs. These items can materially affect the final bill if they are not addressed in the original scope.
When to hire an ERV specialist
Use a contractor who can demonstrate experience with balanced ventilation, not only general furnace or air-conditioner replacement. The installer should be able to explain the airflow design, duct pressure losses, exterior termination plan, balancing method, and control sequence in plain language.
For a retrofit, have the contractor inspect the existing HVAC layout and the home's pressure-sensitive conditions before selecting a connection strategy. For new construction or a major renovation, coordinate ERV routing before ceilings and wall cavities are closed. This reduces the need for long exposed runs and makes service access easier.
Because requirements vary, verify permits and inspections with the local authority having jurisdiction before work begins. Confirm product-specific installation details with the ERV manufacturer and ask your insurer or utility whether either requires separate documentation. General ventilation guidance does not replace locally adopted code, the approved plans, or the manufacturer's instructions.
ERV installation FAQs
Is the ERV unit the largest part of the installation cost?
Not necessarily. The core unit is visible in the quote, but duct routing, wall penetrations, access, electrical work, controls, and balancing can account for a substantial share of the project. Compare the complete installed scope.
Can an ERV use existing HVAC ducts?
Sometimes, but compatibility depends on duct capacity, airflow direction, fan operation, pressure, dampers, controls, and the ERV manufacturer's instructions. An existing duct system should be evaluated rather than assumed to be suitable.
Does an ERV need two exterior wall caps?
Most residential ERV arrangements need a dedicated outdoor-air intake and a separate stale-air exhaust termination. Their locations and required clearances vary by product, code, and site conditions.
Why is balancing necessary?
Balancing verifies that the installed airflow matches the design and that intake, exhaust, supply, and return points operate as intended. It can also reveal excessive duct resistance, incorrect damper settings, or control problems.
Can a smart thermostat control an ERV?
It may be able to provide limited control, but compatibility is product-specific. Confirm the ERV's approved control method, wiring requirements, operating modes, and any needed relay or interface before connecting a third-party thermostat.