Your HVAC Retrofit Questions Answered.
Discover how GRR Cooling Experts engineer and validate HVAC retrofit systems —
keeping hospitals and commercial buildings operational 24/7.
Retrofit Basics
Q: What is an HVAC retrofit and how is it different from replacing the entire system?
A: A retrofit reuses the existing air handling unit housing and integrates modern fan arrays, motors, and controls. It delivers like-new performance, lower costs, and faster installation compared to full replacement.
Q: Why should I choose a retrofit over a new HVAC system?
A: Retrofits cut costs by up to 30%, minimize downtime, and avoid major demolition. GRR specializes in retrofits for critical NYC facilities where full replacement isn’t practical.
Process & Timeline
Q: How long does an HVAC retrofit take?
A: GRR often completes projects over weekends or even within a single day. For example, a 30,000 CFM unit was rebuilt in one day at Kings County Hospital.
Q: Will operations be interrupted during retrofit?
A: No. Our teams work after-hours, on weekends, or in phases to ensure hospitals and commercial tenants keep running without disruption.
Capabilities & Engineering
Q: What size systems can GRR retrofit?
A: From small commercial AHUs to 50-year-old hospital systems exceeding 30,000 CFM. Our engineering team adapts even without existing drawings.
Q: What is N+1 redundancy and do you provide it?
A: Yes. N+1 means one extra fan runs as a backup. If one fails, airflow continues uninterrupted — critical for hospitals and labs.
Energy & Performance
Q: How much energy can I save with a retrofit?
A: Most NYC projects achieve 20–30% OPEX reduction. Savings come from high-efficiency EC motors, optimized airflow, and modern controls.
Q: Will a fan array improve indoor air quality (IAQ)?
A: Yes. Improved airflow distribution reduces hot/cold spots, lowers infection risk in healthcare, and ensures cleaner, balanced air circulation.
Installation & Maintenance
Q: What happens if one fan fails?
A: The system keeps running. GRR fan walls are modular — a single fan can be replaced in hours without shutting down the AHU.
Q: What maintenance is required after retrofit?
A: Minimal. Fans are direct-drive with no belts to replace. We offer ongoing support and monitoring plans to extend performance.
Cost & ROI
Q: How does retrofit cost compare to replacement?
A: Retrofits cost significantly less than full replacement, especially in NYC where demolition and crane work are expensive. Most clients see payback in 2–3 years.
Q: Are there incentives or rebates?
A: Yes. Many GRR projects qualify for Con Edison and NYSERDA energy-efficiency incentives, reducing upfront costs.
Working with GRR
Q: How soon can you respond to urgent retrofit needs?
A: With spare fans in stock and emergency teams available, we can mobilize quickly — especially for hospitals and critical facilities.
Q: Do you handle design, permitting, and commissioning?
A:Yes. GRR manages retrofit projects end-to-end: engineering, permits, installation, balancing, and commissioning.