---

ERV Installation Across Dallas — Energy Recovery Ventilation Done Right

Energy Recovery Ventilators (ERVs) for Dallas tight-envelope homes. Sized correctly for hot-humid climate, paired with whole-home dehumidification. Call 214-238-4349 for project consultation.

---

What an ERV Actually Does

An Energy Recovery Ventilator (ERV) is a balanced mechanical ventilation device that continuously exchanges stale indoor air for fresh outdoor air while recovering 70-80% of the conditioning energy from the exhaust stream. The mechanism:

1. Exhaust air leaving the home passes through a heat-and-moisture exchanger
2. Fresh outdoor air entering the home passes through the same exchanger, moving in the opposite direction
3. The exchanger transfers both sensible energy (temperature) and latent energy (moisture) from the exhaust to the incoming air
4. The result: outdoor air enters the home pre-conditioned, dramatically reducing the cooling/heating load while maintaining IAQ

Why this matters for Dallas:

Modern tight-envelope construction (post-2015 code, spray foam, advanced framing) prevents outdoor humid air from infiltrating naturally. Indoor pollutants (CO2, VOCs, cooking byproducts, moisture from showers and bathing) accumulate without a path out. The home becomes a closed box that traps everything generated inside.

ERVs solve this by providing continuous balanced fresh-air supply without simply dumping outdoor humid air into the conditioned space. For Dallas climate (Hot-Humid Climate Zone 2A per 2021 IECC), proper ERV sizing and integration with dehumidification is what makes the difference between IAQ improvement and humidity disaster.

---

ERV vs HRV — Why Texas Always Uses ERVs

A common point of confusion: ERV (Energy Recovery Ventilator) vs HRV (Heat Recovery Ventilator).

HRV recovers only sensible heat (temperature). Used in cold-dry climates where moisture transfer would dehumidify too aggressively.

ERV recovers both sensible heat AND latent heat (moisture). Used in hot-humid and hot-dry climates where moisture transfer is desired.

For Dallas applications, always ERV — never HRV. Texas hot-humid climate means outdoor moisture transfer to indoor air is exactly what you want to minimize. ERV recovers that moisture in the exhaust stream and transfers it back outside before the fresh-air supply reaches the conditioned space.

Per Part 3 of our DFW Humidity Series — ERVs, Dehumidifiers, or Variable-Speed? — installing an HRV in Dallas is a mistake some contractors make that creates downstream humidity problems.

---

When You Need an ERV in Dallas

An ERV becomes necessary (not optional) when ALL of these conditions apply:

1. Tight envelope. Post-2015 construction with spray foam, advanced framing, continuous air barrier. Or older home that has been substantially renovated with air-sealing upgrades.

2. Mechanical ventilation requirement. 2021 IECC Section R403.6.3 requires tested, measured outside air ventilation in tight new construction. ASHRAE 62.2-2025 specifies ventilation rates.

3. CO2 / VOC / IAQ accumulation symptoms. Stuffy air, off-gassing odors that linger, allergy or respiratory symptoms worse indoors than outdoors, persistent humidity issues that single-stage AC can't address.

For broader Era 5 (post-2015 tight new construction) context, see DFW Humidity Damage by Home Era — the "2021 IECC Ventilation Paradox" section specifically.

---

Proper ERV Sizing for Dallas

The biggest installation mistake we see in Dallas ERVs is undersizing. Standard rules of thumb produce undersized equipment that can't satisfy ASHRAE 62.2 ventilation rates while keeping the moisture load manageable.

Truficient's Dallas-specific sizing rule: ERV capacity should be 10-15% larger than the baseline ASHRAE 62.2 calculation, with humidistat control to modulate ventilation rate based on actual indoor humidity.

For a typical 2,800 sq ft Dallas home with 4 occupants:

• ASHRAE 62.2 baseline: ~80 CFM continuous balanced ventilation
• Truficient Dallas sizing: ~95 CFM ERV with humidistat control
• Operating profile: Continuous low-CFM operation, ramps up when indoor RH or CO2 exceeds threshold

The 10-15% headroom accounts for occupancy spikes (parties, holidays, guests), cooking events that overload kitchen exhaust, and the rare extreme outdoor humidity days when the ERV's moisture transfer slightly underperforms.

---

Why ERV Alone Doesn't Solve Dallas Humidity

This is critical and frequently misunderstood: an ERV alone will not control indoor humidity in Dallas. ERVs transfer moisture between exhaust and supply streams — they don't actively remove moisture from the building.

In a Dallas summer with 70°F+ outdoor dew points, even an 80% efficient ERV is bringing in air at ~55-60°F dew point. That's drier than the outdoor air but still wet enough that the building requires active dehumidification to hold the comfort target of 45-50% indoor RH.

The correct architecture is HVAC+D — Variable-speed inverter HVAC + Whole-House Dehumidifier + ERV. The three components work together:

• ERV — provides fresh air with energy recovery
• Variable-speed HVAC — provides sensible cooling + ongoing latent removal during cooling cycles
• Whole-house dehumidifier — provides latent removal during shoulder seasons when AC isn't running enough to dehumidify

For the full framework, see HVAC+D Framework Explained Dallas TX. For the dehumidifier side, see Whole-House Dehumidifier Dallas TX.

---

Equipment Options

Panasonic Intelli-Balance 100 — quiet, balanced ERV with humidistat control. Common Dallas residential spec.

Aprilaire E080 / E100 / E130 — high-efficiency ERVs designed for hot-humid climates. Excellent integration with Aprilaire whole-house dehumidifiers.

Mitsubishi LGH-RVX — Mitsubishi-branded ERV designed to pair with Mitsubishi inverter HVAC systems via kumo cloud commercial control.

Broan-NuTone AI Series ERV — light commercial and residential ERVs with smart control.

For comprehensive humidity strategy context, see our DFW Humidity Hub.

---

Installation Process

1. Manual J + ventilation calculation. Calculate ASHRAE 62.2 ventilation requirement based on home size, occupancy, and existing exhaust fan capacity.

2. ERV sizing. Apply Truficient's 10-15% Dallas headroom rule. Select ERV model with appropriate capacity and efficiency rating.

3. Ductwork integration. ERV connects to home through dedicated fresh-air supply ductwork (typically to return-side of HVAC system) and dedicated exhaust ductwork (typically from bathrooms or laundry).

4. Humidistat / control wiring. Continuous low-CFM operation with humidity-triggered ramp-up via humidistat. Integration with smart-home systems where applicable.

5. Commissioning. Verify actual measured airflow rates, confirm balance between supply and exhaust, document ventilation rate per ASHRAE 62.2.

6. Integration with dehumidifier and HVAC. Confirm the three-component HVAC+D system operates correctly together — not as competing systems.

---

Adjacent Pages

• DFW Humidity Hub — comprehensive humidity context
• Whole-House Dehumidifier Dallas TX — dehumidifier side
• HVAC+D Framework Explained — Truficient signature framework
• Indoor Air Quality Dallas TX — broader IAQ context
• Part 3 of DFW Humidity Series — the technical guide

---

Get an ERV Project Consultation

Call 214-238-4349 or request a consultation.

Truficient is one of the few Dallas HVAC contractors who properly sizes ERVs for hot-humid climate and integrates them with whole-house dehumidifiers as part of the comprehensive HVAC+D framework.

---

<!-- ============================================================ LOVABLE NOTES ERV foundation page. Anchors humidity Part 3 ERV side of HVAC+D. URL format: .html extension throughout. ============================================================ -->