Small Duct High Velocity (SDHV) Systems: The Smart Retrofit and Space-Saving HVAC Solution

Small Duct High Velocity (SDHV) systems are a modern, efficient approach to heating and cooling that’s gaining popularity among contractors working on both retrofits and new builds. Unlike conventional forced-air systems, SDHV systems use small, flexible ducts and high-pressure airflow to deliver comfort consistently and quietly — even in spaces where traditional systems can’t fit.

What Makes SDHV Different?

• Instead of bulky metal ductwork, SDHV uses 2–2.5" flexible ducts that fit easily through existing walls, attics, and crawlspaces, requiring little to no remodeling.
• The system is designed for continuous air circulation, which mixes the room air from floor to ceiling, eliminating hot and cold spots.
• Small, discreet vent outlets can be installed in ceilings, walls, or floors, blending easily with any architectural style.

Key Benefits for Your Clients:
Perfect for retrofits — Ideal for older homes or buildings where adding conventional ductwork is impossible without major construction.
Whisper-quiet operation — Thanks to sound-dampening insulation, homeowners enjoy consistent comfort without the noise.
Improved energy efficiency — With tighter joints and less surface area for air leaks, SDHV systems reduce wasted energy.
Better indoor air quality — Many systems come with integrated filtration, humidification, and dehumidification, helping reduce allergens, dust, and mold risks.
Moisture control — Cooling cycles can remove up to 30% more moisture compared to standard systems, improving comfort on humid days.

Installation Considerations:
While the system is modular and flexible, it’s best installed by trained professionals familiar with its unique high-pressure design. Proper layout, vent placement, and balancing are key to achieving the promised efficiency and comfort.

Where Can You Use It?

• Historic home retrofits
• Custom homes with open designs
• Small commercial spaces
• Projects requiring minimal visible mechanicals

SDHV systems are a win-win: homeowners and building owners get modern comfort and energy savings, while contractors gain a versatile solution that expands retrofit and new-build opportunities. Exploring this technology can set your business apart and position you at the forefront of efficient, space-saving HVAC solutions.