Bottom Line Up Front
The Aprilaire 8100 ERV brings fresh outdoor air into tightly sealed buildings while recovering 82% of the heating and cooling energy from the exhausted indoor air. Required by ASHRAE 62.2 in new construction and retrofits with air sealing below 0.35 ACH, the 8100 is the contractor-preferred ERV for buildings up to 2,500 sq ft. Energy recovery pays back the ventilation energy penalty over 3-5 years in most climates.
Spec Sheet
| Model | 8100 |
| Airflow | 110 CFM |
| Type | Energy Recovery Ventilator (ERV) |
| Heat Recovery | 82% sensible, 72% latent |
| Coverage | Up to 2,500 sq ft |
| Duct Connection | 6-inch round |
| Voltage | 120V / 60Hz |
| Sound Level | 41 dB |
| Warranty | 5-year limited |
| Price | $900–$1,600 installed |
Extended Analysis
Energy recovery ventilators address a fundamental tension in building science: tight buildings are energy efficient but require mechanical ventilation to maintain indoor air quality. ASHRAE 62.2 establishes minimum ventilation rates for residential and light commercial buildings. As building codes mandate tighter envelopes, mechanical ventilation with heat recovery becomes both required and economically justified.
An ERV recovers both sensible heat (temperature) and latent heat (moisture) from the exhaust airstream, transferring energy to the incoming fresh air. In winter, the ERV warms incoming cold outdoor air using the heat from stale indoor air being exhausted — capturing 82% of the temperature differential and 72% of the moisture. In summer, the process reverses: the cool, dry conditioned indoor air pre-cools the hot, humid incoming outdoor air.
The distinction between ERV and HRV (Heat Recovery Ventilator) matters in climates with high summer humidity. An HRV only recovers sensible heat; an ERV also recovers moisture. In humid climates (southeastern U.S., Gulf Coast), an ERV is the correct specification because it transfers moisture from the humid incoming air to the dry exhaust air, reducing the dehumidification load on the HVAC system. In dry climates (western U.S.), an HRV is often preferable because moisture transfer is not desired.
How It Compares
| Model | Efficiency | Price | Key Spec | Score | Type |
|---|---|---|---|---|---|
| Aprilaire 8100 ERV | 110 CFM | $900–$1,600 | 82% recovery | 5 years | ★★★★½ 4.5 |
| Fantech SHR 1504 HRV | 148 CFM | $800–$1,400 | 75% sensible only | 5 years | ★★★★☆ 4.3 |
| Broan HRV100S | 100 CFM | $600–$1,100 | 70% sensible only | 3 years | ★★★★☆ 4.1 |
Customer Reviews
The Aprilaire 8100 is my standard ERV specification for Passive House and tight envelope projects. The 82% heat recovery is among the highest in its class. Installation is straightforward with the 6-inch duct connections. Clients appreciate the IAQ monitoring integration available through Aprilaire's controls. The 5-year warranty provides project warranty coverage for the defects liability period.
Specified on four net-zero projects. The energy recovery performance is as published — verified with monitoring on all four buildings. The sound level at 41 dB is acceptable for commercial applications. My limitation feedback: the 110 CFM capacity is adequate for residential but undersized for commercial buildings over 2,000 sq ft requiring ASHRAE 62.1 compliance — those projects need larger units.
Our house is certified at 0.21 ACH50 — mechanical ventilation is essential. The 8100 has maintained excellent CO2 levels (consistently below 800 ppm in all rooms) while keeping our energy use for ventilation minimal. The heat recovery in Minnesota winters is critical — without ERV, ventilation would cost us 15-20% more in heating energy. Excellent product for tight buildings.
Frequently Asked Questions
What is the difference between an ERV and HRV?
An ERV (Energy Recovery Ventilator) transfers both heat and moisture between exhaust and incoming air streams. An HRV (Heat Recovery Ventilator) transfers only heat. In humid climates, ERVs are preferred because they reduce the moisture load from incoming outdoor air. In dry climates, HRVs are preferred because you do not want to transfer the limited indoor moisture to the dry outdoor exhaust.
When is an ERV required?
ASHRAE 62.2 requires mechanical ventilation in residential buildings with air infiltration below 0.35 ACH naturally. New construction built to energy codes in most states requires an ERV or HRV. Commercial buildings follow ASHRAE 62.1. Retrofit projects that add significant air sealing also trigger ventilation requirements.
How does the Aprilaire 8100 install?
The 8100 installs in a mechanical room, crawl space, or attic with two 6-inch duct connections: one to the outdoors (intake) and one for exhaust. Two additional ducts connect to the HVAC system or directly to rooms for supply and exhaust distribution. Installation requires a licensed HVAC contractor in most jurisdictions.
What maintenance does the Aprilaire 8100 require?
Filter cleaning every 6 months (two reusable filters). Core inspection and cleaning annually. The energy recovery core is removable for cleaning with mild soap and water. No refrigerant or combustion components to service. Annual maintenance takes approximately 30 minutes.
Does an ERV replace a dehumidifier?
In moderate climates, an ERV reduces indoor humidity by pre-conditioning incoming outdoor air, which can reduce the dehumidification load on the HVAC system. However, an ERV is not a dehumidifier — it transfers moisture proportionally, reducing but not eliminating outdoor moisture entry. In very humid climates or buildings with significant moisture sources, a supplemental dehumidifier is still required.