GRR COOLING EXPERTS | NYC | SINCE 2007
GRR COOLING EXPERTS | NYC | SINCE 2007
HVAC Retrofit Engineering & Execution in New York City
HVAC Retrofit Engineering & Execution in New York City
Proven in hospitals and other critical facilities, with the same retrofit discipline applied to large commercial and industrial buildings across New York City.
Proven in hospitals and other critical facilities, with the same retrofit discipline applied to large commercial and industrial buildings across New York City.
350+
Retrofit Projects
10M+
kWh Savings Delivered
1000+
Fan Arrays Installed
0
Unplanned Downtime
Proof From the Field
12,000 CFM | 7-Hour Window
Hospital Return Fan Retrofit for OR Support
Two ECM fans, custom duct transitions, a new control panel, and stable return airflow delivered under active hospital conditions.
30-Ton RTU | 7 Hours Onsite
Live Rooftop HVAC Replacement
Existing equipment removed, curb prepared, new RTU lifted into place, duct transitions fabricated, and the system commissioned within one onsite window.
2-Coil System Rebuilt as 3 Coils
Hospital Chilled-Water Coil Section Retrof
When like-for-like replacement would not fit, GRR redesigned the coil section around actual access, piping, drainage, and service conditions.
Proof From the Field
12,000 CFM | 7-Hour Window
Hospital Return Fan Retrofit for OR Support
Two ECM fans, custom duct transitions, a new control panel, and stable return airflow delivered under active hospital conditions.
30-Ton RTU | 7 Hours Onsite
Live Rooftop HVAC Replacement
Existing equipment removed, curb prepared, new RTU lifted into place, duct transitions fabricated, and the system commissioned within one onsite window.
2-Coil System Rebuilt as 3 Coils
Hospital Chilled-Water Coil Section Retrof
When like-for-like replacement would not fit, GRR redesigned the coil section around actual access, piping, drainage, and service conditions.
Retrofit Engineering Built Around Existing Conditions
Retrofit Engineering Built Around Existing Conditions
A successful HVAC retrofit starts with the system already in place.
GRR evaluates airflow and static pressure requirements, equipment condition, access, ductwork, electrical service, controls, and shutdown limitations before the installation plan is finalized.
Our team coordinates equipment selection, field modifications, installation, balancing, startup, and commissioning as one retrofit scope. This approach is especially important in hospitals and other critical facilities, but it also applies to large commercial and industrial buildings where downtime and access must be controlled.
Related technical guide: EC Fan Array Retrofits in NYC Hospitals and Commercial Buildings
A successful HVAC retrofit starts with the system already in place.
GRR evaluates airflow and static pressure requirements, equipment condition, access, ductwork, electrical service, controls, and shutdown limitations before the installation plan is finalized.
Our team coordinates equipment selection, field modifications, installation, balancing, startup, and commissioning as one retrofit scope. This approach is especially important in hospitals and other critical facilities, but it also applies to large commercial and industrial buildings where downtime and access must be controlled.
Related technical guide: EC Fan Array Retrofits in NYC Hospitals and Commercial Buildings
Core HVAC Retrofit Services
HVAC Retrofits & Fan System Upgrades
Modernize Your Building’s Air Systems: Energy-efficient retrofits and fan wall upgrades that cut operating costs by up to 30%
Commercial HVAC Maintenance & Repair
Keep Your Facility Running at Peak Performance: 24/7 service and preventive maintenance programs designed for hospitals, offices, and large facilities.
Emergency Cooling Solutions (NYC Area)
Rapid Response When Systems Fail:
On-call experts for urgent breakdowns, ensuring minimal downtime in mission-critical environments.
Why Companies Choose GRR
Why Companies Choose GRR
Engineering through execution
Engineering through execution
Assessment, engineering, installation, startup, and handoff managed as one coordinated scope.
Critical-environment experience
Critical-environment experience
Hospital and critical-facility experience where airflow, uptime, access, and risk must be controlled.
Limited-shutdown planning
Limited-shutdown planning
Work sequenced around occupied spaces, access constraints, and narrow shutdown windows.
Balancing & verified performance
Balancing & verified performance
Airflow, controls, alarms, and restart performance verified before handoff.
“GRR Cooling Experts specializes in complex HVAC retrofits for hospitals and commercial buildings across New York City. With fan arrays in stock, UL-certified engineering, and weekend turnaround, we replace outdated air handling units in record time — delivering reliability, energy efficiency, and peace of mind.”
Ruslan Galyanurov,
Founder & CEO
Customer Testimonials
Brooklyn Hospital Center
Chief Facilities Engineer
“GRR’s retrofit team completed our 30-year-old AHU upgrade in a live hospital environment without interrupting a single OR schedule. Their planning, infection-control measures, and precision balancing made the transition seamless. Energy readings show a 27% reduction in fan power — exactly what was projected.”
Columbia University
Director of Capital Projects
“Our research labs needed reliable airflow and redundancy upgrades. GRR’s engineers understood the constraints of our older infrastructure and integrated EC fan arrays that now tie directly into our BMS. The project finished ahead of schedule, and the acoustics improvement was immediately noticeable.”
NewYork-Presbyterian
HVAC Operations Manager
“When one of our main air-handling units failed unexpectedly, GRR mobilized overnight with a modular fan-array replacement. Within 48 hours, full airflow was restored. Their technical expertise and coordination with our in-house team were outstanding — truly professionals you can count on in critical environments.”