$160 to $12,000 for a solver, when all you wanted was a refrigeration cycle
EES is a general-purpose equation solver: you write the cycle model, and you own its unit handling, its charts and its validation. Its pricing climbs steeply with headcount, and it is Windows-only. Evodelta does the refrigeration part for you, on verified physics, for the price of a coffee.
Verified state — EES (Engineering Equation Solver)
A general-purpose equation solver with a built-in property database. CoolPack's engine sits on top of it — powerful, and famously unfriendly.
Live pricing (verified 2026-10-06): $160 student · $600 single-user commercial · $1,200 single-user professional · $2,400/$4,800 for 5 users · $3,900/$7,800 for 10 · $6,000/$12,000 for 20. Windows-only, and no refund after installation (10% processing fee).
Side by side
Competitor column reflects the vendor's own published facts as verified on 2026-10-06.
| Aspect | EES (Engineering Equation Solver) | Evodelta |
|---|---|---|
| What it is | General-purpose equation solver — you supply the model | Purpose-built refrigeration and heat-pump cycle design |
| Time to first cycle | You write and debug the equations first | Pick the fluid and the four temperatures; the cycle is drawn and solved |
| Charts & reports | Build them yourself | P-h diagram, state-point table, PDF/CSV export, shareable links |
| Platform | Windows-only | Nothing to install — runs in the browser on Windows, macOS, Linux, Chromebook, iPad and phone |
| Price | $160 student · $600–$1,200 single user · up to $12,000 for 20 users | Free tier, no card. Solo $49/month — $0 to start |
| Refunds / friction | No refund after installation (10% processing fee) | Per user, cancel anytime. No per-seat ladder, no install fee, no 'no refund after installation' |
| Lineage | CoolPack's engine is partly EES-based — the abandoned tool and the expensive solver are the same family | CoolProp Helmholtz EoS, actively maintained |
If you are switching
Honest migration path — including what does not transfer.
- 1.Keep EES for genuinely custom equation systems — it is good at that.
- 2.For standard and cascade refrigeration cycles, the model is already written in Evodelta: enter conditions, read state points, size pipe, export the report.
- 3.If a lecturer or reviewer wants the re-derivation, point them at the worked example on /verification rather than a folder of EES files.
Two decades of refrigeration students met EES through CoolPack, and CoolPack is now abandoned. If you have an EES licence and an EES-shaped workflow, Evodelta removes the modelling tax for the standard cases — at $0–$49 instead of $160–$12,000.
Every figure on this page is traceable to the vendor's own published documentation. Where a vendor publishes no number, this page says so rather than estimating.