Struggling with an HVAC heating and cooling system that doesn’t perform as expected? Learn about the five most common problems and how simulation-based fixes can restore comfort, efficiency, and control.
From office towers and universities to care homes and government buildings, HVAC heating and cooling systems are critical to occupant comfort and energy performance. Yet many systems struggle to operate as designed—especially in buildings that have evolved over time or weren’t sized correctly in the first place.
Here are five of the most common issues building teams face, and how to solve them using modern HVAC design software and system simulation.
If one room is freezing while another feels like a sauna, your system likely suffers from poor zoning or control logic. This is especially common in open-plan offices, retrofitted spaces, and multi-use buildings.
The fix: Simulate how temperature behaves under various loads and adjust zoning, valve authority, and sequencing accordingly. Tools like Hysopt allow you to model this before you make any physical changes.
An HVAC heating and cooling system must manage more than temperature—it also needs to handle humidity, fresh air, and filtration. Poor ventilation leads to complaints, condensation, and even health risks.
The fix: Map airflow paths, pressure zones, and ventilation effectiveness in the system model. Use simulation to test how your setup handles real-world weather and occupancy fluctuations.
Discover how to improve system-wide ventilation and comfort ›
Many buildings were designed for different usage profiles than they have today. As heating and cooling loads change, legacy systems become oversized, inefficient, and prone to failure.
The fix: Instead of guessing, simulate the system’s actual behaviour. Simulation can show whether upgrading pumps, rebalancing flow, or tweaking control logic would be more effective (and cheaper) than full replacement.
A major pitfall in many buildings is equipment that works fine at full load but performs terribly under part-load conditions—where buildings spend most of their operating hours.
The fix: Use dynamic HVAC simulation tools to test how well your system handles low or varying loads. Optimisation can often come from adjusting setpoints, valve behaviour, or sequencing—not replacing equipment.
Without a clear performance baseline, it’s nearly impossible to diagnose problems early or quantify improvements. BMS dashboards often lack the resolution to spot inefficiencies until complaints roll in.
The fix: Build a digital twin of your HVAC system to monitor flow, temperature, and pressure. With live and simulated insights, you’ll know where things go wrong before they spiral into full-blown issues.
Whether you’re dealing with hot/cold complaints, spiralling energy bills, or underperforming legacy plant, solving problems in your HVAC heating and cooling system doesn’t require guesswork.
With simulation-led tools, you can model real performance, test solutions, and improve comfort—without defaulting to costly rip-and-replace fixes.
Explore how Hysopt optimises your HVAC system for comfort and efficiency ›
