Looking to add central heating and cooling to an older home without tearing out walls and ceilings? Since 1979, L & H Services Inc. has provided expert Small Duct High Velocity (SDHV) system services throughout Beecher, IL and surrounding communities including Frankfort, Crete, Peotone, and Monee. SDHV systems deliver whole-home comfort through small, flexible 2-inch tubing that weaves through existing walls, ceilings, and floors with minimal remodeling.
Unlike conventional forced-air systems that require large rectangular ductwork, SDHV systems use high-velocity air delivered through insulated flexible tubing and compact supply outlets roughly the size of a CD. This makes them the ideal solution for older homes, historic properties, homes with radiator heat, and additions where traditional ductwork simply won't fit.
SDHV systems also remove up to 30% more moisture than conventional HVAC systems, delivering superior dehumidification and even temperature distribution throughout every room. Combined with whisper-quiet operation and draft-free comfort, SDHV technology offers a premium heating and cooling experience.
Call L & H Services Inc. at (708) 231-4800 or contact us online for SDHV system installation, repair, or maintenance. We serve Beecher, Peotone, Crete, Frankfort, Monee, and all of Will County.
L & H Services Inc. provides comprehensive Small Duct High Velocity system services throughout Beecher, IL and surrounding communities. Whether you need a new SDHV installation, system repair, or ongoing maintenance, our technicians have the specialized training to work with these unique systems.
According to ASHRAE, Small Duct High Velocity systems "deliver conditioned air through undersized ductwork and bendable supply tubes at a higher static pressure (velocity) than conventional forced-air equipment." Instead of the large 6-inch to 12-inch rectangular ducts used in traditional HVAC, SDHV systems use small 2-inch insulated flexible tubing routed through existing wall cavities, between floor joists, and above ceilings.
The system consists of a compact air handler (roughly one-third the size of a conventional unit) that fits in attics, basements, closets, or crawl spaces, paired with a standard outdoor condensing unit. Conditioned air is delivered at higher velocity through the small tubing network to discreet round outlets that blend into walls and ceilings. The high-velocity delivery creates an aspiration effect that mixes room air evenly, eliminating hot and cold spots without the drafty sensation of conventional registers.
SDHV systems work with both air conditioning and heat pump configurations, providing year-round comfort. They are available from leading manufacturers including SpacePak, Unico, and Hi-Velocity, and are compatible with variable-speed and multi-stage equipment for maximum efficiency.
For homes that already have ductwork, consider our furnace installation or mini-split systems as alternative options. Need help deciding? Contact us for a free consultation.
Interested in SDHV for your home? L & H Services Inc. provides free consultations to determine if a Small Duct High Velocity system is the right fit for your home. Contact us now or call (708) 231-4800.
45+ Years Experience
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Many homes built before central air conditioning became standard lack the infrastructure for conventional ductwork. SDHV systems are specifically designed for these situations, providing whole-home comfort without the extensive renovation required for traditional duct installation.
Perfect For:
When adding a room, wing, or finished space to your home, extending existing ductwork may not be practical or possible. SDHV systems provide an elegant solution for conditioning new spaces independently.
Our technicians are trained in proper SDHV system design and installation, ensuring your system delivers optimal performance from day one.
SDHV systems require specialized knowledge for proper diagnosis and repair. Our technicians understand the unique components and operating principles that make these systems different from conventional HVAC.
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Apply NowGet answers to your SDHV system questions
An SDHV system delivers conditioned air through small, flexible 2-inch insulated tubing at higher velocity than conventional ductwork. The system uses a compact air handler and discreet round outlets to provide whole-home heating and cooling without the large rectangular ducts that traditional systems require. It's specifically designed for homes where conventional ductwork isn't practical.
SDHV systems are ideal for older homes, especially those built before central HVAC was standard. If your home currently uses radiators, baseboard heat, or window AC units and you want whole-home central comfort without major renovation, SDHV is likely an excellent fit. We provide free consultations to assess your home's suitability.
No. Despite delivering air at higher velocity, SDHV systems are designed with sound-attenuating components that make them whisper-quiet during operation. The insulated tubing and engineered outlet design minimize noise, and many homeowners find SDHV systems quieter than conventional forced-air systems.
Both SDHV and mini-split systems work well in homes without ductwork, but they differ in approach. SDHV uses hidden tubing with small ceiling/wall outlets for a clean look, while mini-splits mount visible indoor units on walls. SDHV provides more uniform air distribution and better dehumidification. Mini-splits offer individual zone control. We can help you decide which is right for your home.
Installation typically takes 2-4 days depending on your home's size and complexity. Because the flexible tubing can be routed through existing wall cavities and between joists, installation is significantly less disruptive than conventional ductwork, which can take much longer and require major construction.
SDHV systems can be up to 30% more efficient than conventional forced-air systems according to the U.S. Department of Energy. The insulated tubing reduces energy loss, the compact design minimizes leakage, and the superior dehumidification means the system doesn't have to work as hard to keep your home comfortable. Ask about financing options that make high-efficiency SDHV systems affordable.
We install and service all major SDHV brands including SpacePak, Unico System, and Hi-Velocity. Our technicians are trained on each manufacturer's specific requirements and have access to OEM parts and technical support. We'll recommend the best system for your home based on your needs and budget.
We recommend professional maintenance twice per year—once before cooling season and once before heating season. Between visits, check your filters monthly and keep outdoor units clear of debris. Regular maintenance is especially important for SDHV systems because the high-velocity airflow depends on clean filters and unobstructed tubing. Join our maintenance plan for scheduled service and priority support.
Yes. SDHV systems are available in both air conditioning and heat pump configurations, providing year-round heating and cooling through a single system. Heat pump SDHV units include a backup heating source for extremely cold days. We also offer hybrid setups that pair SDHV cooling with your existing boiler or radiator heating system.
Yes. We partner with JB Financing and Regions Bank to offer flexible financing options for SDHV system installations. This includes competitive rates, flexible payment terms, and quick approval so you can enjoy whole-home comfort without a large upfront investment.
Get a free consultation for SDHV system installation in Beecher, IL. Our specialists will assess your home and recommend the perfect solution.
Serving Will County Since 1979
Bring whole-home central comfort to your older home without the disruption and expense of conventional ductwork. L & H Services Inc. has been helping homeowners throughout Beecher, IL and surrounding communities enjoy comfortable living since 1979, and our SDHV system expertise means we can transform your home's comfort with minimal impact on your walls, ceilings, and daily life.
Small Duct High Velocity technology is the breakthrough that lets older homes enjoy the same central comfort as new construction—without sacrificing architectural character or enduring major renovation. The small, flexible tubing installs with minimal disruption, and the discreet outlets are barely noticeable.
Whether you're replacing window units, adding cooling to a radiator-heated home, or conditioning a new addition, SDHV delivers premium comfort with superior dehumidification and whisper-quiet operation.
Call L & H Services Inc. at (708) 231-4800 or contact us online for SDHV system services throughout Beecher, Peotone, Crete, Frankfort, Monee, and all of Will County.
Ask about our maintenance plans and financing options to make your SDHV system affordable and well-maintained for years to come.
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