Brand Repair Page
Zehnder ERV/HRV Repair in NYC
AM Profs Inc diagnoses and repairs Zehnder ComfoAir energy and heat recovery ventilation systems across New York City high-efficiency retrofits and Passive House projects. If a unit needs core service or a ducted system isn't balancing airflow correctly, we start from the actual fault.
24/7 urgent repair is available for Zehnder ventilation systems, including weekends and holidays.
Covered Equipment
ComfoAir energy recovery ventilators (ERV)
Heat recovery ventilators (HRV)
Ducted balanced ventilation systems
Comfosystems suite components
Zehnder focuses almost exclusively on ERV/HRV ventilation rather than traditional heating or cooling equipment — highly relevant for NYC's tight-envelope, high-efficiency residential retrofits.
Quick Answer
What is the most common Zehnder repair issue in NYC?
The most common Zehnder calls involve balancing ducted airflow correctly between supply and exhaust sides, along with routine core and filter maintenance. Because these systems are central to a building's fresh-air strategy in tightly sealed retrofits, even minor imbalances are worth addressing quickly.
Last updated: July 2026
Why Zehnder Repairs Need Brand-Specific Service
Zehnder's history includes a genuine engineering milestone from long before its modern ventilation business: the company invented the steel tubular radiator in 1930, a real innovation in hydronic heating distribution at the time.
Jakob Zehnder founded the company in 1895 in Gränichen, Switzerland, originally as a mechanics workshop. Its modern HVAC relevance today centers on high-performance ComfoAir Heat Recovery Ventilation systems widely used in Passive House projects globally. Zehnder Group AG, publicly traded on the Swiss Stock Exchange, owns the brand.
What Makes The Brand Different
Built for tight, high-efficiency envelopes
Zehnder's ComfoAir systems exist specifically to solve the fresh-air problem in tightly sealed, high-efficiency buildings — spaces sealed well enough to save energy also need mechanical ventilation to stay healthy, and that's exactly what these systems provide.
The Comfosystems suite (built out from ComfoAir technology acquired from Dutch company ITH in the early 2000s) remains Zehnder's flagship ERV/HRV lineup, relevant for NYC's growing number of deep energy retrofits and Passive House projects.
Zehnder Systems We Service
Common symptoms, likely causes, what we check first, and when to call for each system type.
ComfoAir ERV/HRV System
Common symptoms: Uneven airflow between rooms, reduced fresh air delivery, or unusual noise from the unit.
Likely causes: Core fouling, filter clogging, or a balancing issue between supply and exhaust airflow.
What we check first: Core condition, filter status, and supply/exhaust airflow balance.
What work is done: Core cleaning or replacement, filter service, and airflow rebalancing.
When to call: If airflow feels uneven between rooms or fresh air delivery seems reduced.
Frequently Asked Questions
Why does my building need a Zehnder ventilation system at all?
Tightly sealed, high-efficiency buildings (including Passive House projects) don't get enough natural air leakage for healthy indoor air, so a mechanical ERV/HRV system like Zehnder's ComfoAir line provides that fresh air deliberately, while recovering energy from the outgoing air.
Did Zehnder really invent the steel tubular radiator?
Yes — in 1930, well before the company's modern focus on ventilation technology.
What is the Comfosystems suite?
It's Zehnder's flagship ERV/HRV product lineup, built out from ComfoAir technology the company acquired from Dutch company ITH in the early 2000s.
Does Zehnder make heating or cooling equipment?
No — Zehnder focuses almost exclusively on energy and heat recovery ventilation, not traditional HVAC equipment.
What areas of NYC do you cover for Zehnder repair?
We schedule Zehnder repair across Manhattan, Brooklyn, Queens, and the Bronx.