Checked Sep 26, 2026
How much does RED Calc (Residential Energy Dynamics) cost?
RED Calc (Residential Energy Dynamics) publishes a free plan. Online building-science tools for HVAC and energy contractors (ASHRAE 62.2 ventilation, load and duct tools).
Prices are as published by RED Calc (Residential Energy Dynamics) on Sep 26, 2026. Check the linked source before buying.
Published rates
Plans and add-ons
Plans
| Plan | Price | Billing |
|---|---|---|
| RED Calc Standalone / Pro (DOE-hosted)free of charge at PNNL | $0/mo | Check vendor |
Pricing source: redcalc.com ↗, checked Sep 26, 2026.
Beyond the plan price
Terms worth checking
- Data export
- unknown
Source notes
What the headline misses
Each point is tied to a dated statement on RED Calc (Residential Energy Dynamics)'s site. Open the source to read the full context.
- The paid Pro tools were sold to the Department of Energy in 2024 and are now free elsewhere; they are no longer available on the original site.
“In 2024, the U.S. Department of Energy purchased the RED online building science tools, both the free version (now called Standalone) and the enhanced Pro version.”
redcalc.com · Sep 26, 2026 ↗
Who it sells to
Prices and quotes are as published on RED Calc (Residential Energy Dynamics)'s own pages on the date shown, before tax and payment processing. Vendors change prices and terms; check theirs before you buy.
The website-cost question
Which part of RED Calc (Residential Energy Dynamics) do you actually need?
A useful tool may be worth keeping. If a website, form or portal is a separate line on your bill, check its full cost, ownership and exit terms before changing anything.
Could RED Calc (Residential Energy Dynamics) be replaced by a tool you control?
Bring one workflow or software bill to a free 30-minute consultation. We’ll discuss whether coding AI and affordable hosting could fit, and what it would take to own and maintain the result.
Practical guidance, not a promise of a cheap or maintenance-free replacement.