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HVAC load estimation · Made in Australia

Drop a PDF.
Get the heat load.BETA

FASTLOADS reads your floor plan, builds a tiny model of the building, and works out cooling and heating loads room by room. Check the walls, glazing and U-values it found, then export a report your client can read.

See a sample report
PDF · DXF · DWG NCC 2022 referenced kW per room U-values in W/m²K

BETA software. FASTLOADS is pre-release. Results are estimates for evaluation only and must be checked by a qualified engineer before they are used for design, equipment selection or compliance.

BETA FASTLOADS BETA program

Build it
with us.

Your projects, our engine, better loads. FASTLOADS is in a closed, invite-only BETA with a small group of HVAC engineers and contractors. Apply to take part: run real plans, tell us what breaks, and help decide what ships.

  • Free for the length of the BETA
  • A direct line to the people building it
  • Your feedback shapes the roadmap
  • PDF import and the Revit add-in included

Invite only. Every application is reviewed by hand and acceptance isn't guaranteed. BETA results must be checked by a qualified engineer.

1

Upload the plan

A vector or scanned PDF, or the DXF and DWG straight from the architect.

2

Review the model

Walls, doors, windows and rooms arrive flagged by confidence. Confirm or fix each one.

3

Export the loads

Room-by-room sensible and latent loads, with every assumption listed.

Features

The whole building, small enough to check in one sitting.

Reads any floor plan

Vector PDFs are read line by line. Scanned and Revit raster exports are traced from the image. The scale comes from the title block, or you set it from one known dimension.

1:50 – 1:500A0 – A4

Real wall types, real U-values

Assign your project's wall, roof and glazing build-ups layer by layer. FASTLOADS works out R and U for each element and flags any density or conductivity it had to assume.

R 2.5 battsU 0.38 W/m²K

Loads per room, not per guess

Fabric, solar, infiltration and internal gains, summed for every room and zone. Change a window and the numbers update before you have finished clicking.

Sensible + latentPDF · CSV
FASTLOADS for Revit

Already have a Revit model? Export it with Fastloads plug-in

Install the FASTLOADS add-in, press Export, and drop the file into FASTLOADS. The building arrives the way the architect modelled it: no tracing, no rescaling, no retyping wall build-ups.

  1. 1

    Export from Revit

    One button on the FASTLOADS tab writes a .fastloads.json file.

  2. 2

    Upload it

    Drag it into FASTLOADS. Levels, types and the site are read in seconds.

  3. 3

    The building builds itself

    Every storey, ready for zones, gains and the heat load.

  • Every level at its real height
  • Wall, floor and roof types, layer by layer
  • Doors, windows and openings in place
  • Site location and true north
  • Rooms and their names
  • Re-export to update what changed
Get the Revit add-in

Your next load calc is one upload away.

FASTLOADS is in a closed, invite-only BETA. Apply for a place — we review every application and let you know either way.

How it works

Welcome back

Log in to open your projects.

New to FASTLOADS?

BETA Application

Apply for the FASTLOADS BETA

The BETA is closed and invite only. Tell us who you are: we review every application by hand and email you if a place is offered. Applying doesn’t guarantee a place.
BETA Terms and conditions

FASTLOADS BETA program terms

Last updated 1 November 2026

FASTLOADS is pre-release BETA software. It is provided for evaluation only. Do not rely on any BETA output for design, construction, equipment selection, certification or compliance without independent verification by a suitably qualified engineer.

1. Agreement

These terms apply to anyone who applies for, or uses, the FASTLOADS BETA program (the BETA), run by REDWORX AU Pty Ltd, the owner of FASTLOADS (we, us), including the web app, the Revit add-in, reports and any other output. By joining the waitlist or using the BETA you agree to these terms. If you join on behalf of a company, you confirm you are authorised to bind it.

2. What the BETA is

  • The BETA is unfinished software under active development. It will contain errors, gaps and inaccuracies.
  • Features, calculation methods, defaults and results may change, be withdrawn or be reset at any time without notice.
  • We do not guarantee availability, uptime, performance or support response times. The BETA may be suspended or ended at any time.
  • The BETA is closed and by invitation only. Anyone may apply, but applying or joining the waitlist does not guarantee a place; places are offered at our sole discretion and we need not give reasons.

3. No reliance on results

  • All loads, airflows, reports and other outputs are estimates for evaluation only. They are not engineering advice and not a certified design.
  • You must not use BETA output as the sole basis for any design, plant selection, tender, certification, NCC compliance statement or other decision.
  • Every input, assumption and result must be checked by a suitably qualified and, where required, registered engineer, who remains fully responsible for the work.
  • You are responsible for confirming that inputs read from drawings and models (walls, glazing, areas, constructions and the like) are correct.

4. Eligibility and access

  • The BETA is intended for building services professionals. The details you give us, including your credentials, must be true and current.
  • Access is personal to you and must not be shared, sold or transferred.
  • We may refuse, suspend or revoke access at any time, including for misuse or breach of these terms.

5. Confidentiality

The BETA, its features, its results and anything we tell you about unreleased work are confidential. Without our written consent you must not publish, share, screenshot for publication, benchmark publicly or otherwise disclose them, except to people in your organisation who need to know for evaluation and who are bound by the same obligation.

6. Your projects and data

  • Only upload drawings, models and data you have the right to use. You remain responsible for your obligations to your clients, including confidentiality.
  • We store and process your project data only to run the BETA, fix faults and improve FASTLOADS. FASTLOADS uses deterministic calculation methods and your project data is not used to train machine-learning models.
  • BETA data may be lost, reset or deleted, including when the BETA ends. Keep your own copies of anything you need.

7. Feedback

We welcome feedback, bug reports and suggestions. You agree we may use them freely, without payment or obligation to you.

8. Intellectual property and acceptable use

FASTLOADS and all of its software, methods, content and branding remain the property of REDWORX AU Pty Ltd. You must not copy, reverse engineer, decompile, scrape, resell or build a competing product from the BETA, attempt to bypass any limit or security control, or use it unlawfully.

9. Fees

The BETA is free while it runs. Taking part creates no obligation to buy. Pricing is still to be confirmed; we will tell BETA members what it is before any paid plan starts.

10. Liability

  • The BETA is provided “as is” and “as available”. To the maximum extent permitted by law, we exclude all warranties, express or implied, including fitness for purpose and accuracy of results.
  • To the maximum extent permitted by law, we are not liable for any loss or damage of any kind, including loss of profit, data, contracts or reputation, rectification costs, or loss arising from undersized or oversized plant, however caused, arising from use of or reliance on the BETA.
  • Nothing in these terms excludes any right or guarantee under the Australian Consumer Law that cannot lawfully be excluded. Where our liability cannot be excluded, it is limited, where the law allows, to supplying the service again.
  • You indemnify us against claims by third parties, including your clients, arising from your use of BETA output or your breach of these terms.

11. Privacy

We use the details you give in your application (name, email, position, company and credentials) to assess your request, run the BETA and contact you about it. We do not sell them. To update or remove your details, email luke@redworx.au.

12. Ending the BETA

You may leave the BETA at any time. We may end it, or your access, at any time. Sections 3, 5, 7, 8 and 10 continue after it ends.

13. Changes and governing law

We may update these terms; continuing to use the BETA means you accept the update. These terms are governed by the laws of Queensland, Australia, and the courts of Queensland have non-exclusive jurisdiction.