Rooftop Duct Insulation: Cut Heat Gain, Cut Costs
Rooftop HVAC systems work harder than almost any other part of a building. Constantly exposed to direct sun, wind, and weather, their ductwork becomes a major source of unwanted heat gain during the cooling season. That heat migrates into supply air before it ever reaches the building, raising interior temperatures and forcing units to run longer cycles to compensate. Over time, this silent energy loss drives up utility costs, increases system wear, and leads to more frequent service calls.
How Solar Heat Hurts Performance
Uninsulated or poorly insulated rooftop ducts can easily reach surface temperatures far above the surrounding air. On hot days, they act like radiant heaters, warming the conditioned air traveling through them. This heat gain raises cooling loads on the system and forces compressors, fans, and motors to operate longer and at higher capacity. The result is wasted energy, reduced cooling efficiency, and unnecessary stress on mechanical components that shortens their operational life.
Even when the HVAC unit itself is operating efficiently, these losses can undermine the entire system’s performance. Occupants experience warmer supply air, uneven temperatures, and humidity fluctuations, while facilities staff see increasing energy spend and shortened service intervals.
How QCI Stops the Heat Gain
QCI Thermal Systems installs mechanical insulation specifically designed for rooftop duct systems. Our technicians wrap exposed ductwork in closed-cell insulation and protective jacketing that resists moisture, UV exposure, and mechanical damage. This barrier keeps solar heat from penetrating the duct surface, stabilizing supply air temperatures and dramatically reducing cooling loads.
We pay careful attention to detail—sealing seams and terminations, supporting ducts to prevent sagging, and protecting against thermal expansion and vibration. These best practices prevent air leaks, condensation, and premature wear, while ensuring the insulation stays effective season after season.
Real Energy and Maintenance Savings
Insulated rooftop ductwork directly reduces the run time and energy consumption of cooling equipment. Facilities see lower electric bills, more stable comfort conditions, and extended lifespans for compressors, belts, and fan motors. Over the long term, this investment pays for itself in avoided energy costs and reduced maintenance calls—especially during the peak demand periods when equipment failure hurts the most.
Don’t let your ducts work against you. QCI can help you reduce rooftop heat gain, cut energy waste, and keep your systems running reliably for years to come. Contact our team today to schedule a site assessment.