Enthalpy and sensible exchangers differ primarily in moisture transfer. Selection depends on climate, occupants and building operation.
What is recovered
A sensible exchanger transfers heat between air streams; an enthalpy exchanger also transfers some water vapour. It is not equivalent to an active humidifier, dehumidifier or air conditioner.
Winter scenario
Establish whether humidity is actually low after occupancy and balancing. Moisture recovery may help, but wet activities and construction moisture change the need.
Summer and control
Heat and moisture transfer depend on both air-stream conditions. Clarify bypass, summer modes and cooling interaction; winter efficiency alone cannot establish summer comfort.
Service and tested data
Check permitted cleaning, filter replacement, pressure drop and exchanger access. Comparisons need matching test conditions, leakage information and frost-protection data.
Common mistakes
The term enthalpy does not mean maintenance-free operation or guaranteed humidity. Do not change the exchanger without manufacturer compatibility confirmation and a settings review.
| Item | Parameter | Check / result |
|---|---|---|
| Sensible | Heat | Assess humidity separately |
| Enthalpy | Heat and some moisture | Mode and climate |
| Both | Flow, noise, service | Balancing |
What this means for your project
Compare both options on the same duct system and operating point. Consider measured humidity, summer comfort and maintenance cost.
Sources and scope of review
- DOE Building Science Education — Energy recovery ventilation
- PHI — Ventilation component certification criteria
Related reading
- How to Choose an MVHR Unit for a House
- Winter Humidity in Homes with MVHR
- Thermal Bridges: Where They Occur and Why They Matter