MicroMetl is proud to celebrate more than 60 years in the HVAC industry. During that time, we’ve supported contractors, engineers, and technicians through countless equipment transitions, technological shifts, and evolving ventilation standards.
As energy recovery technology has matured, ERVs (Energy Recovery Ventilators) have become a standard solution for improving indoor air quality and reducing HVAC energy loads. Today, many early-generation ERVs are reaching the end of their service life, and the industry is entering a new phase of widespread ERV replacement.
Even though ERVs are no longer part of MicroMetl’s active manufacturing portfolio, our long-term experience with energy recovery technology gives us a clear viewpoint: ERV replacement requires more planning and evaluation than many teams expect.
The ERV Marketplace Has Changed
The first wave of ERVs installed 15–20+ years ago were typically specified by engineers to meet strict building requirements. As these systems age, contractors are increasingly asked to replace them—but often without the original specs, drawings, or ventilation criteria.
A common scenario we hear from the field:
Contractors receive only an old part number and are asked to “match it.”
This approach can lead to incorrect sizing, unnecessary cost, or poor performance. Building usage, ventilation codes, and HVAC system technologies have changed significantly since those original installations.
Before Replacing an ERV, Start With a Simple Question: What Has Changed?
Building needs evolve. Codes evolve. Occupancy patterns evolve.
Replacing an ERV with an identical unit—without assessing the current requirements—can result in oversizing, undersizing, or inefficiency.
Examples of changed conditions:
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- Former smoking rooms:
These required high air change rates. Today, most have been repurposed, and replacement ERVs may require far less ventilation.
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- Office converted to conference room:
Meeting rooms benefit from demand-controlled ventilation using CO₂ sensors rather than constant supply airflow.
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- Reduced or increased occupancy:
Occupant density affects ventilation needs dramatically.
The bottom line: Matching old specs may not reflect today’s needs—and may cost the building owner unnecessary money.