What an Energy Recovery Ventilator Does
An ERV is a balanced mechanical ventilation system. It continuously exhausts a stream of stale indoor air and supplies an equal stream of fresh outdoor air, and as those two air streams pass each other inside the unit's core, heat and a portion of humidity transfer from the warmer, more humid stream to the cooler, drier one. In Georgetown's summer, that means incoming outdoor air gets pre-cooled and pre-dehumidified before it enters your ductwork, and in winter, incoming cold air gets pre-warmed, both without your HVAC system doing all of that conditioning work from scratch. The result is fresh air exchange without the full energy penalty of simply cracking a window or running an unbalanced exhaust fan that pulls in unconditioned replacement air through random gaps in the building envelope.
ERV vs. HRV, the Actual Difference
Both an ERV (Energy Recovery Ventilator) and an HRV (Heat Recovery Ventilator) work on the same core principle, they exchange stale and fresh air while recovering heat between the two streams. The difference is moisture. An HRV transfers heat only, leaving the incoming air's humidity largely unaffected by the outgoing stream. An ERV's core additionally transfers a portion of water vapor along with the heat. In a humid climate like Georgetown's, that matters: an ERV brings in less added summer humidity than an HRV would, easing the load on your AC's dehumidification duty, and in winter it retains a bit more of the home's humidity that would otherwise be exhausted outside. For most Georgetown homes, that moisture transfer works in the home's favor, which is why ERVs are generally recommended over HRVs in this climate.
Homes built to current Texas energy codes are sealed far more tightly than construction from even 10 to 15 years ago. That tightness cuts energy waste, but it also traps stale air, cooking odors, and elevated CO2 indoors far longer than an older, leakier house would. We see this most in newer subdivisions where homeowners notice persistent stuffiness or humidity swings that a properly maintained HVAC system alone can't resolve, because the actual problem is a lack of fresh air exchange, not a mechanical fault.
When a Georgetown Home Needs an ERV
Newer homes built to current energy codes exchange far less air naturally through the building envelope, making mechanical fresh air ventilation necessary rather than optional.
A home that feels stuffy, holds cooking or pet odors, or has elevated indoor CO2 despite a clean, well-maintained HVAC system usually needs more fresh air exchange, not a bigger filter.
If humidity swings persist even after other equipment is properly sized and functioning, uncontrolled infiltration or an undersized fresh air strategy may be the actual root cause.
Occupants reporting ongoing IAQ discomfort in a home with clean filtration and a properly serviced HVAC system often benefit from the diluting effect of continuous fresh air exchange.
ERV Installation Considerations
Sizing an ERV starts with calculating the continuous fresh air airflow your home actually needs, based on square footage, occupancy, and how tightly the building envelope is sealed, rather than picking a unit off a shelf. Most residential ERVs mount in an attic, a utility closet, or a mechanical room, with dedicated supply and exhaust ductwork run to key living spaces, bedrooms, and common areas. Where the layout allows it, we tie fresh air distribution into existing supply ductwork to minimize new duct runs, though a fully independent duct path gives more precise control over exactly where fresh air lands in the home. We also account for filter maintenance access and core cleaning intervals during installation planning, since neglected filters reduce both airflow and energy recovery efficiency over time.
Controls matter as much as the unit itself. Most ERVs run on a dedicated wall control or integrate with a compatible smart thermostat, letting the system run continuously at a lower speed or boost to a higher setting during high-occupancy periods or after cooking. We set up controls to match how the household actually uses the space rather than leaving a unit running at a single fixed speed regardless of need.
ERV Installation Questions
Related Indoor Air Quality Services
Fresh Air Ventilation for Your Georgetown Home
Stale air, stuffiness, or humidity that won't stabilize, an ERV addresses the ventilation root cause.