The simple rules
of using AST.

These terms are between you (“you”) and AST HEATING LIMITED (“AST Heating”, company number SC482919, registered in Scotland at 9 Pitcruvie Park, Lundin Links, Leven, Fife, KY8 6HY). By using the helper at astheating.com you accept these terms.

AST Heating is an informational helper for households worldwide with heating, boiler, radiator or thermostat questions. It helps you describe a fault, prepare for an engineer visit, and translate engineer notes into plain English.

AST is not a repair service, a diagnostic medical tool, a safety inspection, or a substitute for a licensed heating engineer certified in your country (for example, Gas Safe in the UK, RGI in Ireland, NATE in the US, HRAI in Canada).

• You are 18 or over, or using the site with adult oversight.
• You are responsible for a household that you occupy or manage.
• You will not use the helper for anything illegal or harmful.
• You won't try to attack, scrape at volume, or reverse-engineer the service.

AST guidance is general, not a substitute for trained advice. In any of the following situations, stop using the helper and follow the emergency route:

• A suspected gas leak — leave the property and call your local gas emergency line. Every country has one.
• Carbon monoxide symptoms — open windows, leave, call your local emergency / medical line.
• Water near electrics — switch off power first.
• Any smell of burning or scorched parts on the boiler.

For any gas appliance work, use an engineer certified in your country — look for the local licensed register (Gas Safe in the UK, RGI in Ireland, NATE / licensed HVAC in the US, HRAI in Canada, AGA in Australia, and similar elsewhere).

AST uses pattern-matched guidance. We make reasonable efforts to keep it correct and up to date, but we can't guarantee every output is right for your specific home or appliance. Use judgement and, where in doubt, ask a registered engineer.

To the extent permitted by law, AST Heating is not liable for:

• Consequential loss, loss of profit, or loss of business resulting from use of the helper.
• Costs incurred from acting on guidance in place of a qualified engineer.
• Outages of third-party services the helper depends on.

Nothing in these terms limits our liability for death or personal injury caused by our negligence, fraud, or anything else that cannot be excluded by applicable law. Your statutory rights as a consumer in your country of residence are not affected.

Prices are quoted in US dollars (USD). One US dollar equals 100 credits. Each AST tool displays its credit cost before you run it; credits are deducted on generate.

Free trial. We grant 500 one-time credits on account creation. Trial credits do not expire until used; they are not transferable and not redeemable for cash.

Pay-as-you-go packs. One-off purchases (Starter $9 / Standard $29 / Power $99). Credits remain in your account for 12 months from purchase. Unused credits expire after that window.

Monthly subscriptions. Home ($29/mo), Home Pro ($79/mo) and Household ($199/mo) each grant a monthly allowance that resets on your billing date. Unused subscription credits may carry over up to one calendar month; beyond that, they expire. You may cancel at any time; cancellation takes effect at the next billing date.

Top-ups and over-use. If you exhaust your allowance inside a month, you can purchase additional credit packs (pay-as-you-go pricing) — these sit alongside your subscription allowance and follow the 12-month PAYG expiry.

Refunds. Unused PAYG credits are refundable for 14 days from purchase. Partial-use refunds are pro-rated by remaining balance. Subscriptions follow the cooling-off rule described in our Refund policy — that policy has the full formula, timing, and chargeback rules, and prevails if anything here conflicts with it.

Taxes. Prices exclude applicable sales tax / VAT, which will be added at checkout based on your billing address.

Price changes. We may change prices or credit costs for new purchases at any time. Existing pay-as-you-go credits and open subscription terms are honoured at the price paid; subscription renewals may reflect a new price, and you will be notified at least 30 days in advance.

Chargebacks and misuse. Fraudulent chargebacks or abusive patterns of use (scripted access, attempts to avoid metering) may result in suspension of credits and termination of the account.

The AST name, logo, design, code and content belong to us. You can use the helper for your own household — you can't copy the design, strip the brand, or rebuild a competing service from our outputs.

We try to keep the helper online and current. Sometimes we take it down for maintenance or change features. We don't promise the service will always be available.

We can update these terms. Material changes will be surfaced on the site. Continuing to use the helper after a change means you accept the new terms.

These terms are governed by the laws of Scotland, where the company is registered. Disputes are subject to the courts of Scotland. Consumers retain any mandatory rights granted by the laws of their country of residence — this clause does not override them.

Questions about these terms — email support@astheating.com or write to 9 Pitcruvie Park, Lundin Links, Leven, Fife, KY8 6HY.

See also: Privacy policy · Support