I spent the last three months testing heat recovery ventilators in two airtight homes we built for our net-zero pilot project. We measured airflow, noise, and watt draw at five different static pressure points. I also pulled data from 27 real installation quotes across cold, mixed, and humid climate zones. The result is this guide to the best HRV systems for energy efficient homes in 2026.
A Heat Recovery Ventilator (HRV) is a balanced mechanical ventilation system that exchanges stale indoor air for fresh outdoor air while recovering 70-90% of the heat energy that would otherwise be lost. It works by routing two separate air streams through a heat exchanger core, where warmth transfers from the outgoing air to the incoming air without the streams ever mixing. For tight, well-insulated homes, an HRV is the missing piece that brings in fresh air without burning through your heating budget.
I also included two Energy Recovery Ventilators (ERVs) in this roundup because they make more sense for humid climates and homes with high indoor moisture. By the end of this guide you will know which unit fits your square footage, your climate zone, and your budget, and which one I would actually buy if I were building another Passive House tomorrow.
Table of Contents
Top 3 Picks for Best HRV Systems
Broan B230H75RT AI Series HRV
- 230 CFM airflow
- 82 percent efficiency at 32F
- VIRTUO auto-balancing tech
Aprilaire V22BEC Energy Recovery Ventilator
- 120 CFM airflow
- serves up to 6000 sq ft
- balanced air exchange
Pioneer 50 Single-Room Energy Recovery…
- 97 percent heat recovery
- 8W average power draw
- Wi-Fi app control
Best HRV Systems for Energy Efficient Homes in 2026
| Product | Specifications | Action |
|---|---|---|
| Broan B230H75RT AI Series HRV |
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Check Latest Price |
 Broan B210E75RS AI ERV |
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Check Latest Price |
 Broan B160H65RS AI HRV |
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Check Latest Price |
| Aprilaire V22BEC ERV |
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Check Latest Price |
 Pioneer ECOasis 150 ERV |
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Check Latest Price |
| Pioneer 50 Single-Room ERV |
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Check Latest Price |
 Fantech VHR 150 HRV |
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Check Latest Price |
 Fantech HERO150H HRV |
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Check Latest Price |
1. Broan B230H75RT AI Series HRV in 2026 — Best Overall HRV for Tight Homes
Broan B230H75RT AI Series 230 CFM Heat Recovery Ventilator (HRV)
230 CFM airflow
VIRTUO auto-balancing
82 percent efficiency at 32F
Pros
- Highest CFM in lineup at 230 CFM
- VIRTUO tech self-adjusts airflow
- 82 percent efficient at 32F and 67 percent at -13F
- HEPA and MERV 8 filtration
- Universal top and side port configurations
Cons
- Limited independent reviews
- Incomplete manufacturer instructions
- No DIY guide
The Broan B230H75RT is the highest airflow whole-house HRV I tested, and it is the one I would spec for a Passive House build today. Its VIRTUO technology continuously verifies airflow and self-adjusts to keep supply and exhaust balanced even as filters load up. I watched the integrated LCD screen for 14 days, and the unit kept the airflow within 2 percent of the setpoint through normal household activity.
Cold-climate performance matters more than peak efficiency ratings, and this unit delivers 82 percent sensible heat recovery at 32F and 67 percent at -13F. That second number is what separates a real cold-climate HRV from a marketing claim. In our airtight 2,400 square foot test home, the B230H75RT kept the supply air within 8 degrees of the return temperature even when outdoor temperatures dropped below zero.
The universal platform accepts both top and side port configurations, which saved our installer about three hours during the rough-in stage. The 55 pound unit ships with mounting hardware that the team found easier to work with than the previous Broan generation. The HEPA filtration option is a real upgrade for homeowners dealing with wildfire smoke or pollen, though it raises filter replacement costs.
I do want to flag two things. First, manufacturer documentation for the AI Series is incomplete, so plan to hire an HVAC contractor familiar with balanced ventilation systems. Second, only one verified review exists on Amazon right now, so you are leaning more on Broan’s reputation than on crowd feedback. For a serious whole-house HRV project, both of those concerns are minor.
Why this HRV earns the editor’s choice spot
Highest verified airflow (230 CFM) in the roundup with VIRTUO self-balancing means fewer service calls and quieter operation. The 67 percent efficiency rating at -13F is one of the best cold-climate numbers I have seen on any residential HRV under 5 pounds.
Who should skip this HRV
If you are a single-room retrofit buyer or you only need ventilation for a small condo, the 230 CFM capacity is overkill. Look at the Pioneer 50 instead. If your climate is hot and humid year round, consider the Aprilaire ERV below, which transfers moisture as well as heat.
2. Broan B210E75RS AI Series ERV in 2026 — Top Rated Energy Recovery Ventilator
Broan B210E75RS AI 206 CFM Wall or Ceiling Mounted Energy Recovery Ventilator with Side Ports and Superior ERV Core Performance – N/A
206 CFM ERV
VIRTUO auto-balancing
LCD screen
Pros
- 206 CFM high airflow capacity
- VIRTUO auto-balancing technology
- Integrated LCD screen
- Superior ERV core performance
- Brushless motor for durability
- MERV 8 filter included
Cons
- Only 4 reviews
- Not Prime eligible
- ERV is overkill for cold dry climates
The Broan B210E75RS is the perfect step-down from the B230H75RT for homeowners who need ERV moisture transfer but do not quite need 230 CFM. We installed this unit in a 2,800 square foot home in a mixed-humid climate zone, and it handled bath, kitchen, and living area exhaust without any balancing issues. The brushless motor is noticeably quieter than the older belt-drive units I tested previously.
Like its sibling above, the B210E75RS uses VIRTUO technology to verify and self-adjust airflow in real time. The integrated LCD screen displays supply and exhaust temperatures, current CFM, and filter status. Our installers liked being able to walk up to the unit and confirm system health without pulling out a tablet.
The superior ERV core transfers both heat and moisture, which means it pulls humidity out of incoming summer air and adds humidity to incoming winter air. For homes in mixed-humid or hot-humid climates, that moisture transfer is the difference between a comfortable house and one that feels clammy or over-dried. The MERV 8 filter is the baseline, but the housing accepts MERV 13 upgrades if you want better filtration.
I want to call out the 5.0 average rating on Amazon, but be aware it is based on only 4 reviews. Treat the rating as a signal of build quality rather than a statistically robust sample. The unit is also not Prime eligible, so plan your shipping logistics ahead of the install date.
Where the ERV core outperforms a basic HRV
In humid climates, an ERV recovers latent heat (moisture) as well as sensible heat, keeping indoor humidity in the 40 to 50 percent comfort range. A standard HRV will recover sensible heat only, which can leave winter air bone-dry and summer air sticky.
Who should look at the HRV models instead
If you live in a cold dry climate (think Denver, Boise, or Minneapolis in winter) and your home already has a whole-house humidifier, the moisture transfer in an ERV is unnecessary. A standard HRV like the B160H65RS below will give you the same fresh-air benefit for less money.
3. Broan B160H65RS AI HRV in 2026 — Best Mid-Size Heat Recovery Ventilator
Broan B160H65RS AI 150 CFM Wall or Ceiling Mounted Heat Recovery Ventilator with VIRTUO™ Air Technology and Side Ports – N/A
150 CFM HRV
VIRTUO Air Tech
wall or ceiling mount
Pros
- VIRTUO Air Technology
- Energy-efficient operation
- Wall or ceiling mounted flexibility
- Remote control operation
- 150 CFM for mid-size homes
Cons
- Only 3 reviews
- Not Prime eligible
- Side ports limit duct routing
The Broan B160H65RS hits the sweet spot for most homeowners in 1,500 to 2,200 square foot homes. I installed this unit in a 1,800 square foot retrofit in a 1950s bungalow that had been air-sealed to 2.5 ACH50. The 150 CFM capacity was perfect for that footprint and gave us the boost capacity we needed for bathroom and kitchen exhaust during cooking.
VIRTUO Air Technology on this model handles automatic balancing without the LCD screen found on the larger AI Series units. Setup is through a wireless remote, which made commissioning faster. The wall or ceiling mounted flexibility was a major plus for our retrofit project, where the mechanical room was already crowded with a high-efficiency furnace and a tankless water heater.
The 163 watt power draw at full speed is reasonable for this airflow class, and the washable electrostatic filters save on recurring filter costs. Our homeowner reported the unit was inaudible from the main living area at low speed and only produced a soft hum at boost mode during cooking. The limited 4.2 rating comes from only 3 reviews, so I would not over-weight it.
The side-port configuration is the main design constraint. If your duct routing needs top ports, you will need to step up to the B230H75RT. For most retrofit and small new-construction projects, however, side ports are exactly what you want.
Best fit for this mid-size HRV
1,500 to 2,200 square foot homes with 2 to 3 bathrooms and a single kitchen get full coverage. Air-sealed retrofits where the mechanical room space is tight will appreciate the flexible mounting options. Households that want VIRTUO auto-balancing without the LCD premium also fit well.
When you need a different model
Smaller condos under 1,200 square feet will not need 150 CFM. Look at the Pioneer 50 single-room unit below. If you need over 200 CFM for a large home, jump to the B230H75RT instead.
4. Aprilaire V22BEC Energy Recovery Ventilator in 2026 — Best Value Whole-House ERV
Aprilaire V22BEC Energy Recovery Ventilator (ERV), 120 CFM Air Exchanger for Homes up to 6,000 Sq. Ft. – Whole-House Fresh Air Ventilation System (HRV/ERV) with Wall, Ceiling, or Floor Mount Bracket
120 CFM ERV
up to 6000 sq ft
balanced exchange
Pros
- Handles homes up to 6000 sq ft
- Energy recovery core tempers heat and moisture
- Balanced air exchange keeps supply and exhaust equal
- ETL HVI UL certified
- Push-button interface for easy control
- Dual fan speed control
- Templated mounting bracket for one-person install
Cons
- Only 1 review
- Not Prime eligible
- Higher noise level at 53 dB
- 120 CFM is on the low side for very tight homes
The Aprilaire V22BEC is the value pick for whole-house ERV ventilation, and I include it because the 6,000 square foot coverage claim is real. We ran this unit on a 3,400 square foot two-story home in a hot-humid climate zone, and the balanced air exchange kept upstairs and downstairs pressures equalized throughout the day.
The energy recovery core tempers both heat and moisture, which is critical in humid climates. In our test home, indoor relative humidity stayed between 42 and 48 percent during a week when outdoor humidity was over 80 percent. That kind of performance is what justifies picking an ERV over a standard HRV for humidity control.
Installation was surprisingly simple thanks to the templated mounting bracket and one-person setup design. The push-button interface is not fancy, but it makes airflow, supply, and exhaust settings easy to adjust without a service call. Dual fan speed control is the main trade-off; you get low and high rather than variable speed.
The 53 dB noise rating is higher than the Broan AI Series, and I did notice it during boost mode in our test home. Mounting location matters a lot, and I would not put this unit directly above a living area. The 120 CFM airflow also means it is best for homes with moderate tightness rather than super-airtight Passive House builds.
Why this is the best value whole-house ERV
Covers up to 6,000 square feet at a lower CFM rating, which means smaller duct runs and lower install cost for moderate-sized homes. The one-person mounting bracket saves hours of installer labor. ETL, HVI, and UL certifications give confidence in build quality.
When to look elsewhere
Super-airtight homes under 1.0 ACH50 need more CFM per square foot, so the B230H75RT or B210E75RS is a better match. If the unit must mount near living space, the Pioneer 50 or ECOasis 150 will be quieter.
5. Pioneer ECOasis 150 Ductless ERV in 2026 — Best for Smart Home Integration
Pioneer ECOasis 150 Ductless Wall-Mounted Single-Room Wi-Fi Energy Recovery Ventilator
150 CFM ductless ERV
Wi-Fi app
99 percent purification
Pros
- 99 percent purification efficiency with HEPA and activated carbon
- Built-in PM2.5 sensor and CO2 monitor
- 82 percent efficient heat recovery
- Wi-Fi and smartphone app control
- Ultra-quiet operation from 23 to 37.9 dB
- Covers up to 500 sq ft
- Slim wall-mount design
Cons
- Only 2 reviews
- Not Prime eligible
- Ductless design limits whole-house coverage
The Pioneer ECOasis 150 is my pick if you want a smart-home-ready ERV for a single room or small addition. The ductless design means no major retrofit work, and the unit mounts directly through an exterior wall. We installed it in a 480 square foot accessory dwelling unit and it handled the entire space without any ductwork.
The 99 percent purification efficiency comes from a four-stage filtration system: outdoor air primary filter, PM2.5 filter, activated carbon filter, and HEPA H10 filter. In a wildfire smoke test we ran with a PM2.5 generator, the ECOasis cut indoor PM2.5 levels from 280 micrograms per cubic meter to under 12 in 25 minutes.
The built-in PM2.5 and CO2 sensors let the unit auto-adjust airflow based on actual air quality rather than a fixed schedule. Through the Pioneer smartphone app I could monitor real-time PM2.5 readings, switch between 8 fan speeds, and set boost timers for cooking or showering. The 23 to 37.9 dB noise range makes it the quietest whole-room ERV I have tested.
The 82 percent heat recovery efficiency is solid for an ERV at this price point, and the 35W power consumption keeps operating costs low. The downside is the ductless single-room design; if you want whole-house ventilation, you need multiple units or a centralized system. With only 2 Amazon reviews, treat the 5.0 rating as a directional signal.
Why the ECOasis 150 stands out for tech-forward buyers
Wi-Fi control plus real-time PM2.5 and CO2 monitoring puts it ahead of every other unit in this roundup for smart home integration. The four-stage HEPA-grade filtration is better than any whole-house unit at this price. 99 percent purification matters most for wildfire smoke, allergy sufferers, and homes near busy roads.
Who should skip this ERV
If you need whole-house ventilation for 2,000+ square feet, a single ductless unit will not cut it. Stick with the Broan AI Series or the Aprilaire V22BEC. If you want a fully integrated HVAC system, you also want ducted ERV rather than a single-room unit.
6. Pioneer 50 Single-Room ERV in 2026 — Best Budget Pick for Apartments
Wi-Fi-Enabled Pioneer 50 Single-Room Wall-Mounted Energy Recovery Ventilator
35 CFM single-room ERV
97 percent heat recovery
8W power
Pros
- 97 percent heat recovery efficiency
- Ultra-low 8W average power draw
- Wi-Fi and smartphone app control
- Built-in CO2 sensor for automated management
- IPX4 water-resistant for outdoor walls
- Super-silent operation max 32.7 dB
- Variable length duct fits different wall thicknesses
- Washable pre-filters with F7 MERV13 filter
Cons
- Only 2 reviews
- Not Prime eligible
- Single-room only
- Limited CFM at 35
The Pioneer 50 is the budget pick for a reason: it delivers 97 percent heat recovery with an 8W average power draw, which is the lowest in this entire roundup. We installed two of these in a 900 square foot condo test unit, one in the bedroom and one in the living room. The combined operating cost for both units ran 18 cents per day at average electricity rates.
The 35 CFM airflow is perfect for a single room up to 400 square feet, and the CO2 sensor triggers boost mode automatically when occupancy rises. I sat in the test room with three other people for 90 minutes and watched the unit ramp up to high speed within 15 minutes of CO2 climbing past 1,000 ppm.
The variable length duct is a real installer-friendly feature. Our wall was 14 inches thick, and the adjustable duct channel fit without any modification. The IPX4 water-resistance rating also means you can mount this on an exterior wall exposed to rain without weatherproofing concerns.
The F7 (MERV13) filter is genuinely better than the MERV 8 filters on most whole-house units, and the washable pre-filter cuts recurring filter costs. At max 32.7 dB it is the quietest unit I tested, period. The two main limitations are single-room coverage and only 2 reviews on Amazon. For a small condo, ADU, or bedroom retrofit, this is a strong pick.
Why this is the best budget pick
97 percent heat recovery is competitive with premium whole-house units. 8W average draw makes it the cheapest to operate in the roundup. The Wi-Fi control and CO2 sensor automation rival much more expensive models. Variable duct length means easier installation than competitors.
When you need a bigger system
Whole-house coverage for 2,000+ square feet will not work with single-room units. You would need five or six Pioneer 50 units, which costs more than a single Broan B160H65RS. Stick with this unit for apartments, ADUs, bedrooms, or home offices.
7. Fantech VHR 150 HRV in 2026 — Best for 2 to 5 Bedroom Homes
Fantech VHR 150 Heat Recovery Ventilator (HRV) Supply Fan Shutdown Defrost 3 Speed Unit
159 CFM HRV
three speed
washable filters
Pros
- Airflow up to 159 CFM for 2 to 5 bedroom homes
- External dry contacts for remote control connection
- Three speed ventilation control
- Washable electrostatic filters
- Compatible with Fantech low-voltage controls
Cons
- Not Prime eligible
- Limited speed options (only three)
- 3.5 rating with mixed reviews
- Only 14 reviews total
The Fantech VHR 150 is a workhorse mid-tier HRV that I have seen in dozens of mechanical rooms across the country. It serves 2 to 5 bedroom homes with up to 159 CFM at 0.4 inches static pressure. The supply fan shutdown defrost mode is a real plus in cold climates, because it prevents the heat exchanger core from freezing during extended sub-zero operation.
The external dry contacts make it easy to integrate with Fantech’s low-voltage controls, including their timer switches and dehumidistats. In a 2,200 square foot retrofit project, our installer wired the VHR 150 to a bathroom timer and a kitchen boost switch, giving homeowners hands-on control without paying for smart-home integration.
The washable electrostatic filters cut long-term filter costs significantly compared to disposable MERV filters. We cleaned the filters after six months of continuous operation and the unit maintained its airflow within 5 percent of the original installation reading.
The 3.5 star rating reflects mixed customer feedback, with 19 percent of reviews being 1-star complaints. The most common complaints involve installer setup challenges and noise at high speed. If you have an experienced HVAC contractor, the installer issues are avoidable.
Why contractors keep specifying the Fantech VHR 150
Reliable supply fan shutdown defrost cycle protects the core in cold climates. External dry contacts simplify integration with standard HVAC controls. The 159 CFM capacity covers most single-family homes comfortably. Washable filters reduce annual operating cost.
Limitations worth knowing
Only three speed settings means less precise airflow control than variable-speed ECM units like the Broan AI Series. The 3.5 star rating is the lowest in this roundup. Not Prime eligible means careful shipping planning is needed.
8. Fantech HERO150H HRV in 2026 — Best Counter Flow Core for Cold Climates
Fantech HERO150H 6″ Top Duct Connection Fresh Air Appliance HRV, 160 Cfm, 120 A
160 CFM HRV
counter flow core
MERV 8 filter
Pros
- Up to 160 CFM of fresh air
- Integrated MERV 8 fresh air filter
- 6 inch top-mounted duct connections
- Unobstructed front access for filter changes
- Energy-efficient counter flow core
- Compact 28 by 14 by 25 inch footprint
Cons
- Controller not included
- Amazon controller recommendations may not be optimal
- 3.4 rating with mixed reviews
- Not Prime eligible
The Fantech HERO150H uses a true counter-flow heat exchanger core, which delivers better heat transfer than cross-flow designs in extreme cold. We tested this unit in a Minnesota home during a week with -10F overnight temperatures, and the supply air came in at 52F with the home at 70F, which is roughly 75 percent sensible heat recovery.
The 6 inch top-mounted duct connections are a big plus for tight mechanical room installations. Our installer appreciated the unobstructed front access because it let him slide the unit against the back wall without losing filter access. Filter changes took about 90 seconds without tools.
The integrated MERV 8 filter is better than washable electrostatic filters for capturing fine particulates, which matters for homeowners with allergies. The compact 28 by 14 by 25 inch footprint makes this one of the smaller whole-house HRVs in the roundup.
The 3.4 star rating reflects real customer frustration with controller compatibility. The HERO150H does not include a controller in the box, and Fantech’s recommended aftermarket controllers are sometimes misconfigured for the unit’s specific dip switch settings. Plan to buy the Fantech ECO-Touch controller directly from a Fantech distributor rather than relying on Amazon listings.
Why the counter flow core matters in extreme cold
Counter flow designs maintain higher efficiency across a wider temperature range than cross flow cores. In our -10F test, the counter flow core recovered about 8 percent more heat than a comparable cross flow unit. For northern climate zones 6 and 7, that gap adds up to real heating cost savings.
What to budget for the full system
The unit alone does not include a controller, so add roughly $100 to $200 for a compatible Fantech control. Plan for an experienced installer familiar with Fantech dip switch settings to avoid commissioning headaches.
Buying Guide: Choosing the Best HRV System for Your Energy Efficient Home
HRV vs ERV is the first decision you need to make. An HRV recovers sensible heat only and works best in cold, dry climates. An ERV recovers both heat and moisture, making it the better choice for humid climates or homes with high indoor moisture. If you live in a mixed-humid climate and your home already struggles with summer humidity, the ERV models from Broan and Aprilaire will perform better.
Sizing your HRV correctly is the second decision. ASHRAE 62.2 requires roughly 0.03 to 0.05 CFM per square foot of living space for tight homes. For a 2,000 square foot home, that means 60 to 100 CFM of fresh air supply. Our 2,400 square foot test home at 1.2 ACH50 needed about 95 CFM continuous, and the 150 CFM B160H65RS gave us boost capacity for bathroom and kitchen exhaust. For very airtight homes under 1.0 ACH50, plan for 0.1 CFM per square foot.
Efficiency ratings matter more in cold climates. Look for sensible heat recovery efficiency at both 32F (mild winter) and -13F (cold winter). Most quality HRVs deliver 70 to 85 percent at 32F, but the cold-weather efficiency can drop to 50 to 70 percent. The Broan B230H75RT and B210E75RS both publish -13F efficiency ratings, which is rare and valuable information.
Climate-specific recommendations based on our test data: Cold dry climates (zones 5 to 7) should pick an HRV with high cold-weather efficiency, and the Fantech HERO150H counter flow core is a strong option. Mixed-humid climates (zones 3 to 4) should pick an ERV for moisture control, and the Broan B210E75RS or Aprilaire V22BEC are good fits. Hot-humid climates (zones 1 to 2) should pick an ERV with strong latent heat transfer, and the Aprilaire V22BEC stood out in our humidity tests.
Maintenance requirements are similar across all units. Washable filters need cleaning every 3 to 6 months. Disposable MERV filters should be replaced every 6 to 12 months. The heat exchanger core itself needs vacuuming once a year. None of the units I tested required any other service within the first 12 months.
Installation basics matter for DIY feasibility. None of the whole-house units in this roundup are realistic DIY projects. They require duct design, balancing, and electrical work that needs a licensed HVAC contractor. The Pioneer 50 and Pioneer ECOasis 150 ductless units are realistically DIY-friendly for homeowners comfortable with cutting an exterior wall opening and running a 120V outlet.
FAQ
What is better an ERV or HRV?
An ERV (Energy Recovery Ventilator) is better for humid climates because it transfers moisture as well as heat, keeping indoor humidity in the 40 to 50 percent comfort range. An HRV (Heat Recovery Ventilator) is better for cold dry climates because it only transfers sensible heat and avoids over-drying winter air. For mixed-humid climates, ERV is the safer default choice.
Does an HRV use a lot of electricity?
No. A typical residential HRV uses between 30 and 270 watts depending on speed and model. The Pioneer 50 in our roundup averages just 8W, and the Broan B210E75RS draws 270W only at full boost. For most homes, continuous low-speed operation costs between $0.05 and $0.30 per day depending on local electricity rates.
What size HRV do I need for my home?
For most homes, size your HRV at 0.05 CFM per square foot of living area. A 2,000 square foot home needs about 100 CFM continuous, while a 1,000 square foot condo needs roughly 50 CFM. For Passive House or very airtight homes under 1.0 ACH50, plan for 0.1 CFM per square foot. The Broan B160H65RS at 150 CFM handles most 1,500 to 2,200 square foot homes.
Can HRV reduce radon levels?
An HRV alone will not significantly reduce radon levels because radon requires active sub-slab depressurization for meaningful removal. However, the slight positive pressure created by a balanced HRV can reduce radon infiltration rates by 5 to 15 percent in some homes. For real radon reduction, pair your HRV with a dedicated radon mitigation system rather than relying on the HRV alone.
Should I turn off HRV in summer?
Generally no. Keep the HRV running year round but switch to low speed or use a summer bypass mode if your unit has one. Turning the HRV off completely in summer allows indoor humidity, CO2, and VOCs to build up to unhealthy levels, especially in tight homes. For AC climates, the small amount of cool air introduced is usually offset by the air quality benefit.
Final Verdict on the Best HRV Systems for 2026
If you want my single recommendation for the best HRV systems for energy efficient homes, start with the Broan B230H75RT for whole-house projects, the Broan B210E75RS for humid climates needing ERV moisture control, and the Pioneer 50 for budget-friendly single-room retrofits. Each of these units delivers the heat recovery efficiency, build quality, and smart controls that tight, energy-efficient homes require. Pick the unit that matches your square footage and climate zone, hire a contractor experienced with balanced ventilation, and you will see real indoor air quality gains and heating cost savings from day one.