About Load Calc Designs in Meridian, ID

Family-Owned HVAC Design Specialists Serving the Treasure Valley

Load Calc Designs is a family-owned residential HVAC design and energy efficiency company serving Meridian and the Treasure Valley. With more than 10 years of HVAC industry experience, we bring a blend of system design expertise and hands-on ductwork installation knowledge to every project. This combination gives us a practical understanding of how HVAC systems perform in real-world conditions—not just on paper.


We focus exclusively on residential projects, which allows us to specialize in creating HVAC systems tailored to the exact needs of each individual home. Every building has unique characteristics—floor plan layout, window placement, insulation levels, ceiling heights, and orientation—that affect heating and cooling requirements. Our approach starts with understanding these details so the system we design matches what your home actually needs, rather than relying on generic sizing methods that often lead to oversized equipment, uneven temperatures, and wasted energy.


Our goal is to reduce energy consumption while improving HVAC comfort, airflow, and overall performance. When a system is properly sized and the ductwork is designed to deliver the right amount of conditioned air to each room, you'll notice more consistent temperatures, quieter operation, better humidity control, and lower utility bills. These aren't theoretical benefits—they're measurable outcomes of accurate load calculations and thoughtful system design.



If you're working on a new construction project in the Treasure Valley, reach out to discuss how proper HVAC design affects long-term comfort and efficiency.

ACCA-Compliant Calculations Using Wrightsoft Software

We use Wrightsoft software to perform ACCA-compliant Manual J, S, and D calculations for every residential project. Manual J determines the heating and cooling load for each room based on construction details, climate data, and occupancy patterns. Manual S uses those load calculations to select equipment that matches your home's requirements without oversizing. Manual D designs the duct system to deliver the correct airflow to each space, accounting for duct layout, friction losses, and register placement.



Meridian's climate—with cold winters and warm summers—requires HVAC systems that can handle significant temperature swings while maintaining efficiency. Our calculations account for local weather patterns, insulation standards, and construction practices common throughout the Treasure Valley. This ensures the system performs well year-round, not just during mild weather.

For complex projects, we offer builder and contractor site walks to review duct routing, equipment placement, and field conditions that might affect the design. When requested, we provide field coordination to address questions or changes that come up during construction. This hands-on approach comes from our background in both design and installation—we understand the coordination required between trades and the importance of resolving issues before they become expensive corrections.



We serve homeowners, builders, and contractors throughout Meridian, Boise, Nampa, Caldwell, Eagle, Kuna, Star, Garden City, Middleton, Payette, McCall, Coeur d'Alene, and Pocatello.

What You Can Expect Working with Our Team

As a small, family-owned operation, you'll work directly with experienced HVAC design professionals who handle your project from start to finish. We require a full set of architectural plans to begin work—including site plan, foundation plan, floor plan, elevations, and roof plan—because accurate calculations depend on complete building details. Once we have your plans, we deliver completed Manual J, S, and D calculations with a 2-3 day turnaround for projects 4,000+ square feet, priced at $0.12 per square foot.


  • Family-owned and operated—small team focused exclusively on residential HVAC design
  • More than 10 years of HVAC industry experience combining system design and hands-on installation
  • Serving Meridian and communities throughout the Treasure Valley
  • ACCA-compliant Manual J, S, and D calculations using Wrightsoft software
  • Builder and contractor site walks available for complex projects and field coordination


If you're planning a new construction project and want an HVAC system designed to match your home's actual heating and cooling needs, contact us to discuss your plans. We'll walk you through the process and explain how proper load calculations and duct design improve comfort and reduce long-term energy costs.