Comparison

ERV vs HRV: Which Ventilation Recovery System Fits?

An HRV recovers heat only. An ERV recovers heat and moisture. Compare climate, humidity goals, frost control and maintenance.

Mechanical, HVAC & Fluids · Last reviewed October 17, 2026

Short answer: in a cold climate where indoor air gets too dry, or in a hot humid climate where you want to keep outdoor moisture out, an ERV is usually the better fit. In a cold climate where indoor humidity is high and needs to be removed, an HRV can be better.

	HRV (heat recovery)	ERV (energy recovery)
What it transfers	Sensible heat only	Sensible heat and moisture (latent energy)
Moisture	Exhaust moisture leaves with the exhaust air	Part of the moisture moves between the airstreams
Cold climate, winter	Removes indoor moisture with the exhaust, which helps when the air is too humid, and dries the house when it is already dry	Returns some moisture to the supply, which helps keep indoor air from drying out
Hot humid climate, summer	Cools incoming air, but humid air passes through	Reduces the moisture that enters, lowering the load on the air conditioner
Frost control	Condensation in the core can freeze in very cold weather, so a defrost cycle is needed	Less condensation, so less frost, though cold-climate units still have defrost
Condensate drain	Needs a drain for condensate	Often no drain, since the moisture is transferred
Maintenance	Filters and core cleaning, and the drain	Filters and core cleaning, and cores should not be washed unless the maker allows it
Cost	Usually a little lower	Usually a little higher

How to choose

Decide the humidity goal: do you need to add, keep or remove indoor moisture over the year?
Check the winter and summer design conditions of the site.
Check the ventilation rate and the airflow range of the unit, and its rated sensible and total recovery efficiencies.
Check frost protection for the lowest temperature expected.
Plan the filters and the access for cleaning.

Common mistakes

Using an HRV in a very dry cold climate and finding the house too dry in winter.
Using an ERV where the indoor air needs more moisture removal, such as a tightly built house with a lot of indoor moisture.
Forgetting that ventilation only recovers part of the energy, and that efficiency ratings are measured at set test conditions.
Not cleaning the filters, which cuts the airflow.

Related tools and labs

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Questions

Does an ERV mix the airstreams?

A well-made core keeps them separate, with a small leakage rate that standards limit. Check the cross-leakage rating for sensitive uses.

Can I use an ERV for dehumidifying?

It lowers the moisture of incoming air but is not a dehumidifier. A separate dehumidifier or the air conditioner removes the rest.

Educational material. Examples use simplified, hypothetical inputs and are not a design, a construction document or professional engineering advice. Confirm requirements with the codes and standards adopted where the work is built and with a licensed engineer.

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