Short answer: the account is free forever. Calculating is free, with a preview of the results. You unlock the full results and the PDF report with a purchase: €29 for the whole project, €19 for one module or €25 for two, VAT included (124 zł in złoty, $32 in dollars for the whole project). With several houses a month the Installer subscription at €35 a month costs less. Managing the subscription itself, invoices and payment methods are covered separately in subscription, invoices and payments.
What the free account includes
On a free account you work in any number of projects without entering a card. Every module is available: the heat loss calculation, heat pump sizing, underfloor heating, heat recovery ventilation, the client form and the Algo assistant. The calculations run in full - what we limit is how much of the result you see on screen and in the PDF.
In underfloor heating you draw by hand on one storey; storeys imported from the heat loss calculation do not count towards that limit. One AI section drawing per account is free.
A building-design reading, from which Algo enters the rooms, building elements, windows and doors, is not paid for separately: a reading uses the same monthly Algo limit as the chat and does not use a report. The limit grows once you buy a report and is largest with a subscription; when it is used up, Algo says so before the start. One reading also fills heat pump sizing and heat recovery ventilation at no extra cost. One account can run up to 10 readings per 24 hours. The details are in the heat loss calculation guide.
My library - the constructions, windows, doors, ventilation units, fittings and radiators saved on your account and available in every project - holds 5 entries in total on a free account. Only an active subscription lifts that limit; a report does not change it. If your subscription lapses, the saved entries stay, and you add a new one once you are below the limit again.
The preview in each module shows:
- in the heat loss calculation - the building's total heat demand, the W/m² index and one fully calculated room; the other rooms are covered ("Value available once the project is unlocked"),
- in heat pump sizing - the recommended pump with its output, supply temperature, SCOP, annual consumption and installation cost,
- in underfloor heating - one fully calculated loop: the first one you assign to a room; that room's totals show when the loop is the only one in it,
- in ventilation - room roles, required flows, the supply-extract balance and duct velocities.
Unlocking the project adds: the full heat loss table of every room and the method details (source sizing, thermal bridges, n50, ventilation) in the heat loss calculation; the full list of matched pumps and the variant comparison (SCOP, annual usage, installation cost) in pump sizing; spacing, loop lengths, the manifold, the printable floor plan and the bill of materials for the wholesaler in underfloor heating; resistances, pressure, the unit verdict and the printable duct plan in ventilation. In underfloor heating, unlocking also lets you add further storeys by hand.
On a free account the first loop of a new underfloor project may be calculated with a delay - we calculate a few projects at a time, and the screen then shows a date ("The first loop in this project will be calculated on ..."). An unlocked project is calculated in full right away.
On the covered room cards in the heat loss calculation you see "Locked - unlocks on activation". Activation here means unlocking the project with a report or a subscription - nothing more. HeatAlgo has no trial period: a free account does not expire and needs no activation to calculate.
A report for a project, or a credit
A report bought inside a project unlocks that project at once; bought outside a project, it goes to your account as a credit. One credit unlocks one project - all of its modules at once, on screen and in the PDF. You can also buy a report for one or two modules. You buy it straight for the project you pick, not as a credit, and adding another module or the whole project costs the difference in the price list while the window of the modules you hold runs. A report for one module costs 79 zł and for two modules 109 zł (€19 and €25 when paying in euro, $19 and $27 in dollars), incl. VAT.
A report costs 124 zł when paying in złoty or €29 when paying in euro and $32 in dollars. The price includes VAT - also when you buy from outside Poland, where the tax for your country is already in the price. One purchase unlocks one project; there are no report packs. Unused credits stay on the account indefinitely - you can buy a report today and spend it six months from now.
You see the number of available credits in the account menu and on the "Billing" page under "Your plan". You buy credits with "Change plan".
How to unlock a project
In the project you want to hand to a client, click "Unlock the full report" - the button is in the project view on the "Client report" card and in every module next to the results. If you have credits, you see the "Unlock this project" dialog saying how many credits it uses; you confirm with "Use a credit". If you have no credits, the purchase dialog opens with a choice: a report for the modules you pick, a report for the whole project, or a subscription.
After unlocking, the full results are on screen immediately and you download the PDF in each module. A full report gets a number in the format HA-year-code (e.g. HA-2026-K7M2XQ), which appears on the cover together with your logo and company details.
The window for new PDF versions: 7 days from the first download
Editing is never limited. New PDF versions for 7 days from each module's first download.
The clock does not start at purchase but on the first PDF download. So you can unlock a project in advance and finish the calculation a week later - the window is still a full one. Each module gets its own 7 days from its own first download for further PDF versions, at no extra cost - a heat loss report downloaded on day one does not shorten the heat pump or underfloor window. How many days are left is shown in the project ("Export until ...") and on the "Billing" page under "Your reports".
Two things worth knowing:
- The printable underfloor floor plan has a separate clock. Its 7-day window runs from the first download of the plan, independently of the report. So you can print the plan for the crew at the start and generate the report at the end of the job.
- When the window closes, the project, the calculations and the full results stay on screen, you keep editing the project, and downloaded files are yours for good. Only downloading a new PDF version closes - that needs the module again or a subscription.
You buy a report for a specific job. Another house needs another report or a subscription - one purchase cannot be moved to another project.
A subscription instead of credits
The Installer subscription covers every project on the account and has no window for new PDF versions: while it is active you download new report versions in every project without limit. It costs 149 zł a month, 134 zł a month when paid six months ahead (804 zł) or 119 zł a month when paid a year ahead (1,428 zł); in euro €35, €31.50/mo (€189) and €28/mo (€336), and in dollars $39, $35/mo ($210) and $31/mo ($372) respectively. Prices include VAT. At prices before discounts, the monthly subscription costs less from 2 reports a month in złoty or from 2 in euro and 2 in dollars. How to buy, cancel and resume it is in subscription, invoices and payments.
For companies doing many houses a month there is the Company plan with an individual quote and invoicing on the company's process - details on the for companies page.
The setup reward
The Start page has a "Setup" card with five steps: "Who you are", "First project", "First report", "Use Algo AI" and "Secure your account". Once you finish all five, you get a discount:
- -20% on a report (the whole project, modules or an upgrade to more modules) or on the first invoice of the monthly or six-month subscription,
- -25% on the first year of the annual subscription.
The lowest price in the 30 days before the reduction, VAT included:
| Product | zł | € | $ |
|---|---|---|---|
| Whole-project report | 123.75 zł | €28.36 | $32 |
| One-module report | 79 zł | €18.10 | $19 |
| Two-module report | 109 zł | €24.98 | $27 |
| Upgrade from one to two modules | 30 zł | €6 | $8 |
| Upgrade from one module to the whole project | 44.75 zł | €10 | $13 |
| Upgrade from two modules to the whole project | 14.75 zł | €3.38 | $5 |
| Monthly subscription | 149 zł | €35 | $39 |
| Six-month subscription | 804 zł | €189 | $210 |
| Annual subscription | 1,428 zł | €336 | $372 |
The discount lasts 30 days and applies itself at checkout - you type no code. Every account gets it, paying ones included, but not an active subscriber. The card's sixth row, "Complete your profile" (the company name and logo on reports), is optional and does not affect the discount.
Where all this is shown
The "Billing" page (account menu, "Plan and billing") has four sections:
- "Your plan" - free account, the number of credits, or the subscription with its paid-until date,
- "Your reports" - the list of unlocked projects with the days left for new PDF versions, separately for the report and the floor plan, and the list of projects not unlocked yet,
- "Orders" - payment and invoice history,
- "Buy" - buying credits or a subscription.
The prices in this article apply from 30 September 2026; the binding price list is always on the pricing page.
What is new in the app this October: the October 2026 update.