Texas HVAC Load Calculations That Actually Get Approved
Stop Wasting Days On Quoting. Stop Encountering Failed Calcs.
Let a trained & certified crew do HVAC load calcs correctly and on time.
The Two Problems Texas Professionals Face Every Day
❌ Good Resources = Hard
You've tried the "quick" online calculators. Results are questionable at best. You've looked at the big-name software - $2,000+ per year and it still takes forever to learn.
✓ Professional load calculations done by licensed engineers. No software to learn, no expensive subscriptions. Just accurate, code-compliant calculations ready when you need them.
❌ Failed "Out of Nowhere"
You think you've got it right. Plans submitted. Feeling confident. Then the inspector calls: "Your load calculations don't meet Texas code requirements. Resubmit with corrections."
✓ Our calculations meet all Texas code requirements and pass inspection the first time. No more rejections, no more delays. Your customers stay happy, and your projects stay on schedule.
"Why Do You Ask So Many Questions About My Project?"
Because we've performed thousands of successful HVAC load calculations across Texas, and we know that accurate calculations require specific details. When we ask questions, it's because we're looking out for you
- Actual window SHGC and U-factors (not generic assumptions)
- Real insulation type and R-values (spray foam vs batt makes a difference)
- The products you're actually installing (not what "usually" gets installed)
- Texas-specific construction details (climate zones, extreme heat requirements, regional considerations)
Yes, it takes 5 extra minutes to provide this information.
But it saves you days of permit delays and expensive resubmittal fees.
We don't guess. We ask. We verify. We get your HVAC calculations right.
That's why architects, builders, and HVAC contractors across Texas—from Houston to El Paso, Dallas to San Antonio—choose ProCalcs when accuracy matters and deadlines are tight.
Texas-Specific HVAC Calculation Expertise
Texas Building Code Compliance
Texas currently follows the 2018 IECC with state amendments for energy standards. Many cities (like Houston, Austin, Dallas) have adopted 2021 or 2024 IECC locally.
All ProCalcs reports comply with local jurisdiction codes, accounting for Texas amendments (blower door 5 ACH50, U-factor/SHGC requirements) and current energy efficiency targets.
Climate Zones for HVAC
Texas spans multiple IECC climate zones:
- Zone 2A (Hot-Humid): Houston, San Antonio, Austin, Corpus Christi
- Zone 2B (Hot-Dry): South-central areas like Uvalde
- Zone 3A (Mixed-Humid): Dallas, Fort Worth, Waco
- Zone 3B (Mixed-Dry): Midland, El Paso
- Zone 4B (Cool-Dry): Amarillo, Panhandle
We apply the correct climate zone and design conditions for every job.
Hurricane & Coastal Requirements
If your project is near the coast, we ensure:
- Windstorm certification (TWIA compliant)
- Hurricane wind loads, anchoring & elevation for equipment
- Salt-air resistance considerations
Energy Performance Requirements
We provide HVAC designs that meet:
- 2018 IECC (state minimum)
- Local energy code enhancements (Austin 2024 IECC, Dallas 2021 IECC)
- HERS Index/ERI-based performance compliance paths
- REScheck, COMcheck, or EnergyGauge documentation
Our Texas HVAC Calculation Services
Manual J Load Calculations
Accurate heating and cooling load calculations for Texas climate zones and building codes
Learn More →Manual D Duct Design
Proper duct sizing for extreme heat and high cooling demands
Learn More →Manual S Equipment Selection
Right-sized HVAC equipment for your climate and energy requirements
Learn More →Manual N Commercial Calculations
Small to medium commercial building load calculations
Learn More →Energy Calculations
Texas energy code compliance and performance-based calculations
Learn More →For Architects
Accurate HVAC calculations for code compliance and plan reviews
Learn More →For Builders
Fast, accurate calcs that keep your construction projects on schedule
Learn More →For HVAC Contractors
Professional calculations that help you sell better HVAC systems
Learn More →Find Your County Building Department
Enter your Texas zip code to find your county's building department and specific HVAC requirements.
Need help understanding your county's specific requirements?
Contact Us for AssistanceWe Serve All Texas Counties for HVAC Calculations
ProCalcs provides professional HVAC load calculations throughout every county in Texas. Whether you're in a major metro area or a smaller county, we deliver the same fast, accurate, code-compliant service. Below are quick links to building departments in some of Texas's most active construction counties:
Don't see your county? Contact us and we'll help you find the information you need.
Ready to Get Started with Your HVAC Load Calculations?
Stop wasting time with companies that don't answer. Stop risking permit rejections. Get accurate, Texas Building Code-compliant calculations with same-day quotes and 15-minute response times.
Serving Texas architects, builders, HVAC contractors, and homeowners
Fast. Accurate. Professional. Every single time.
