Get Your HVAC System Designed Right the First Time
At Green Building Energy Sustainability (GBES), we help homeowners, builders, and contractors eliminate costly HVAC mistakes before they happen. Our Manual J, S, and D calculations ensure your heating and cooling system is perfectly sized, energy-efficient, code-compliant, and built for long-term comfort.
An improperly designed HVAC system can waste thousands in energy costs, struggle to maintain temperature, and even lead to moisture problems and mold. With GBES, you get precise engineering reports that deliver comfort, performance, and peace of mind.
Manual J Load Calculations – The Foundation of Comfort & Efficiency
A Manual J heat load calculation determines exactly how much heating and cooling your property needs — no guessing, no oversizing.
Our engineers analyze:
- Floor plans and square footage
- Insulation and building materials
- Windows, lighting, appliances, and occupancy
- Local climate and building orientation
The result is a customized HVAC load report that maximizes comfort, lowers utility bills, and meets modern energy code requirements.
Manual S Equipment Sizing – Stop Wasting Energy on the Wrong System
Once your load is calculated, Manual S ensures your HVAC equipment is properly selected to match your building’s real needs.
This prevents:
- Oversized systems that have a short cycle, waste power, and cause humidity issues
- Undersized systems that run nonstop and fail to keep up
Instead, you get an HVAC system that runs efficiently, lasts longer, and keeps your indoor environment comfortable year-round.
Manual D Duct Design – Even Comfort in Every Room
Great equipment means nothing without proper airflow. Our Manual D duct design creates a complete duct layout that balances airflow throughout your home or commercial space.
You’ll benefit from:
✔ Proper duct sizing and placement
✔ Improved indoor air quality
✔ Reduced hot and cold spots
✔ Lower installation and material costs
This ensures every room receives the comfort it deserves.
Why GBES Is the Smart Choice for HVAC Design Services
When you work with GBES, you’re getting more than reports — you’re getting expert guidance and fast results.
- IECC-compliant Manual J, S & D reports
- Turnaround in as little as 3–4 business days
- One free revision included
- Dedicated engineers ready to answer questions
- Residential & commercial projects
We make HVAC planning simple, accurate, and stress-free.
Ready to Design Your HVAC System the Right Way?
Avoid energy waste, comfort issues, and costly system replacements.
Let GBES deliver professional HVAC calculations that ensure your project is built for performance and efficiency from day one.
Serving Dallas, Fort Worth, Central Texas, Austin, and San Antonio
Green Building Energy Sustainability Inc.
Main Office:
940-891-3803
Spanish Line:
682-246-8150
Request Inspection or Consultation Today