Mechanical Advantage
For Contractors

Design Support

Manual J / S / D — without staffing an in-house engineer.

Most contractors lose jobs (or lose margin on jobs) because design takes time their team doesn't have. We deliver permit-ready design packages so your team can stay in the field.

What we deliver

  • Room-by-room Manual J load calculations
  • Manual S equipment selection matched to real loads
  • Manual D duct design and airflow planning
  • Documentation formatted for permits and rebates

How it fits your workflow

We work as an extension of your team. Send us plans, photos, or a site visit summary — we return a clean design package you can hand to your installers, your AHJ, and your customer.

Where contractors use us most

  • New construction and additions
  • Spray foam and high-performance retrofits
  • Heat pump conversions where sizing actually matters
  • Comfort complaint diagnostics and redesigns

Ready to take the next step?

Request Design Support