When you build with Premier Structural Insulated Panels (SIPs), you’re not just improving the building envelope—you’re optimizing the entire mechanical system, too.
Traditional building assemblies tend to leak air, requiring oversized HVAC systems to compensate for energy loss. Larger HVAC systems, consume and emit more energy, and contribute more green house gas emissions into the environment. SIPs eliminate this inefficiency, and fossil fuel consumption. Thanks to their continuous insulation and airtight construction, SIP buildings reduce HVAC needs by up to 50%, often cutting the system size from 1 ton per 600 sq ft to 1 ton per 1,200 sq ft.
But to get the full benefits, you need to size your HVAC system properly.
Oversizing HVAC equipment can lead to short cycling, poor humidity control, higher maintenance costs, and reduced comfort. Instead, use ACCA Manual J or REM/Design software to calculate accurate loads that reflect the airtight nature of SIPs.
Premier SIPS structures regularly test below 1.0 ACH50, with many hitting as low as 0.3 ACH50—far exceeding standard building performance (Climate zone dependent standards range between 3-5 ACH50) . That means less air leakage, better energy efficiency, and smaller, more efficient HVAC systems.
>> DIVE DEEPER: UNDERSTANDING SIP VENTILATION AND AIR SEALING REQUIREMENTS
SIPs often eliminate the need for an unconditioned attic, as the panels are strong enough to span rooflines without the need for truss systems (structural engineers are excellent at offering options for this with SIPs). In these cases, ductwork can be routed through interior partition walls or dropped soffits. Eliminating ductwork and blown air altogether, mini-split systems are regularly used in SIPs construction. Planning for the HVAC layout early in the design process keeps installation efficient and compact. An unconditioned attic is also a huge area of air leakage and air infiltration, eliminating this variable contributes to a building's efficiency enabling more efficient HVAC systems.
Learn more and download our Design Best Practices for HVAC with SIPs.
When properly sized, HVAC systems in SIP structures:
By designing HVAC systems specifically for the high performance of SIPs, you’re not only protecting your budget—you’re delivering a healthier, more efficient space for the people inside.
Whether you're designing a single-family home or a large commercial building, integrating SIPs and a right-sized HVAC system is a smarter approach that pays off in performance, long term operating costs and peace of mind.
For more information, connect with a local Premier SIPS rep in your region.
SIPs provide continuous insulation and an airtight building envelope, which reduces HVAC needs by up to 50%. This often allows the system size to shrink from the traditional 1 ton per 600 square feet down to 1 ton per 1,200 square feet.
Old sizing rules of thumb like 1 ton per 600 square feet were built around leaky traditional assemblies and don't apply to SIPs. Oversizing HVAC equipment for a SIP structure can cause short cycling, poor humidity control, higher maintenance costs, and reduced comfort. Use ACCA Manual J or REM/Design software to calculate loads based on the airtight performance of the actual SIP structure.
Premier SIPS structures regularly test below 1.0 ACH50, with many reaching as low as 0.3 ACH50. Standard building performance in most climate zones ranges between 3 and 5 ACH50, making SIP buildings significantly tighter than conventional construction.
Yes. Because SIP buildings are so airtight, they require mechanical ventilation to maintain fresh indoor air, a requirement that has become standard in many jurisdictions regardless of building envelope type. Energy or heat recovery ventilators (ERVs and HRVs) are the recommended solution, exchanging stale indoor air for fresh outdoor air while conserving energy. Exhaust-only systems or ventilating windows can also be used, but must be carefully designed to avoid creating negative pressure.
SIP roof panels are strong enough to span rooflines without truss systems, which often eliminates the need for an unconditioned attic, a common source of air leakage. Without an attic, ductwork can be routed through interior partition walls or dropped soffits, and mini-split systems are commonly used to eliminate ductwork altogether. Planning the HVAC layout early in the design process keeps installation efficient and compact.