BuildSolver Terms of Service.

BuildSolver is an AI-assisted software tool operated by Neurolinker AI LLC(“we,” “us,” “our”) at buildsolver.com (the “Service”). It helps HVAC contractors produce preliminary load calculations, equipment selections, duct sizing, and psychrometric state points by running ACCA Manual J, Manual D, Manual S, and ASHRAE procedures as deterministic code, with an AI layer orchestrating the conversation. The Service is for the sales phase of HVAC work — not for permit submission — and is scoped to HVAC only.

You must be at least 18 and able to enter a contract in your jurisdiction, and not on any US denied-party list. The Service is offered to contractors based in the United States, Canada, or Australia. We do not market to or accept subscriptions from users in the EU, UK, or EEA. Billing is in USD; applicable taxes (GST/HST/PST/QST in Canada, GST in Australia, US sales tax where applicable) are calculated and added at checkout via Stripe Tax. Support is in English.

You sign in by magic link or Google OAuth. You are responsible for access to your email and for activity under your account. One account per person — an in-office assistant acting under your direction is fine; sharing or pooling access across multiple businesses is not.

The Service offers three plans, in USD: Free ($0), Pro ($29/mo or $290/yr — two months free), and Team ($79/mo or $790/yr). Paid plans are billed in advance through Stripe, our payment processor. We do not store full payment card details; card data is stored by Stripe under PCI-DSS Level 1 standards. We do not currently offer free trials.

Auto-renewal. Paid subscriptions renew automatically at the then-current price until you cancel — monthly plans on the monthly anniversary, annual plans on the yearly anniversary. By subscribing, you authorize Neurolinker AI LLC, via Stripe, to charge your payment method on a recurring basis at the chosen frequency until you cancel. After your first charge we email an acknowledgment with renewal terms and cancellation instructions. California residents: this notice and the acknowledgment email are provided as required by Cal. Bus. & Prof. Code § 17600 et seq.

Price & service changes. We may change prices or modify features. For any material price increase to your active plan we give at least 30 days' email notice; you may cancel before it takes effect. If we discontinue a paid feature material to your plan, your sole remedy is a pro-rated refund for the unused portion of that billing period upon written request to support@buildsolver.com, subject to any non-waivable statutory remedies available under your local consumer protection law (see Sections 10 and 13).

Taxes. Prices exclude applicable taxes. For users in Canada, GST/HST/PST/QST is calculated and added at checkout via Stripe Tax. For users in Australia, GST (10%) is added at checkout. US users see state sales tax where applicable. Tax computation is based on the billing address you provide at checkout.

You may cancel a paid subscription at any time, for any reason, from the Stripe Billing Portal at /account → “Manage Billing.” Cancellation takes effect at the end of your current billing period. You keep access to paid features until then; no further charges after that, and no early-termination fee. Cancellation is at least as easy as signup, consistent with the FTC ROSCA negative-option rules and applicable state auto-renewal laws (including California Business & Professions Code § 17600 et seq.).

Cancelling does not delete your account or stored data — see Section 12 (Termination).

Refund and cancellation details are in our Refunds & Cancellation Policy. Monthly subscriptions are non-refundable for past or partial billing periods. Billing-error refunds are available within 60 days of the charge.

Pro and Team have no hard per-calc quota, but a fair-use ceiling applies. We may contact you above 500 calculations per month, and rate-limit or block usage above 1,500 per month if it looks like automation or resale.

You agree not to:

• resell, sublicense, or repackage the Service or its output;
• scrape, mirror, or systematically extract content beyond normal interactive use;
• attempt to extract or train any model on our prompts, system instructions, or tool schemas;
• create multiple accounts to circumvent rate limits or fair-use caps;
• misrepresent Service output as permit-grade work or the work of a Professional Engineer.

BuildSolver calculations follow ACCA Manual J procedures executed in deterministic code, but are not ACCA-approved for permit submission. For permits, use ACCA-approved software such as Wrightsoft. You — the contractor — must verify every output with a licensed Professional Engineer before using it for construction, equipment purchase, permit submission, or anything you put your name on.

BuildSolver output is not:

• professional engineering advice;
• an engineer-client relationship;
• a substitute for stamped or sealed engineering work;
• admissible to an Authority Having Jurisdiction as a sealed calculation;
• the practice of engineering under any state licensure statute.

The Service uses large language models to orchestrate deterministic tools. The orchestration layer can misinterpret inputs, miss edge cases, or produce unexpected output. We do not certify any individual calculation. Treat every output as a draft for PE review.

No training on your inputs. We do not use your project descriptions or any content you submit to train, fine-tune, or improve any foundation model. We may review specific inputs solely to operate, debug, and secure the Service, investigate violations of Section 07, or comply with legal process.

We retain all rights in the Service — software, tool schemas, system prompts, brand assets, and improvements derived from de-identified telemetry. You retain ownership of the project descriptions, design inputs, and brand assets you submit (“Customer Content”). You grant us a limited, non-exclusive, worldwide, royalty-free license — sub-licensable to our subprocessors solely as necessary to provide the Service — to host, process, and render your Customer Content. PDFs produced for your active subscription are licensed to you for use with your end clients in the ordinary course of your HVAC business.

The Service is provided “as is” and “as available,” without warranties of any kind, whether express, implied, statutory, or otherwise. To the maximum extent permitted by applicable law, Neurolinker AI LLC disclaims all implied warranties, including merchantability, fitness for a particular purpose, accuracy, completeness, title, and non-infringement. No statement on the BuildSolver website, in marketing materials, or in Service output constitutes an express warranty.

Liability cap. Our total aggregate liability arising out of or related to the Service or these Terms — whether in contract, tort, statute, or any other theory — is capped at the greater of US $500 or the total fees you paid us for the Service in the 12 months preceding the event giving rise to the claim.

Excluded damages. In no event will Neurolinker AI LLC be liable for:

• indirect, incidental, consequential, special, exemplary, or punitive damages;
• lost profits, lost revenue, lost goodwill, or business interruption;
• damages arising from construction defects, mis-sized equipment, code non-compliance, permit denial, third-party claims against you, or harm to occupants of any building you worked on.

The disclaimers and limitations in this Section do not apply to liability that cannot be excluded under applicable law (gross negligence, willful misconduct, fraud).

Australian Consumer Law. Nothing in these Terms excludes, restricts, or modifies any consumer guarantee, right, or remedy under the Australian Consumer Law (Schedule 2 of the Competition and Consumer Act 2010 (Cth)) that cannot lawfully be excluded, restricted, or modified.

You will defend, indemnify, and hold harmless Neurolinker AI LLC, its officers, employees, and contractors, from and against any third-party claim — including reasonable attorneys' fees — arising from or related to: your use of the Service or any Service output; any reliance by your clients, project owners, occupants, or any Authority Having Jurisdiction on Service output; your failure to verify Service output with a licensed Professional Engineer before construction or permit submission; your violation of Section 07 (Acceptable Use) or any law; or your breach of these Terms.

We will give prompt notice of any claim and reasonable cooperation. You may not settle a claim without our prior written consent if the settlement imposes any obligation on us.

Carve-out.Your indemnification obligations do not extend to claims arising from our own gross negligence, willful misconduct, or fraud, or where indemnification of an indemnitee's own negligence is prohibited by statute (including Wyo. Stat. § 30-1-131 and analogous anti-indemnity statutes).

You may end your paid subscription at any time as described in Section 5. You may close your account by emailing support@buildsolver.com; account deletion is a separate action from cancellation and is processed within 30 days.

We may suspend or terminate your access if you materially violate these Terms, with notice where reasonably practicable. Following termination we retain subscription and billing records as required by applicable law and delete other personal data within 30 days.

Survival. Any provision that by its nature should survive termination — including AI disclaimers, intellectual property, warranty disclaimer, limitation of liability, indemnification, dispute resolution, and these survival, severability, and contact provisions — does survive.

These Terms are governed by the laws of the State of Wyoming, USA, without regard to its conflict-of-laws principles. This arbitration agreement is governed by the Federal Arbitration Act, 9 U.S.C. §§ 1–16, and evidences a transaction involving interstate commerce.

Informal resolution first. Before initiating arbitration, email support@buildsolver.com with a written description of your claim and try to resolve it informally for at least 30 days.

Binding individual arbitration. Any dispute not resolved informally will be settled by binding individual arbitration administered by the AAA (American Arbitration Association) under its Commercial Arbitration Rules, with the seat of arbitration in Cheyenne, Wyoming. Disputes about the scope, enforceability, formation, or interpretation of this arbitration agreement are decided by the arbitrator, except that a court decides the validity of the class-action waiver.

Class action waiver. You and Neurolinker AI LLC agree to bring claims only in an individual capacity. Class actions, collective actions, and representative proceedings are waived to the maximum extent permitted by applicable law.

Opt-out. You may opt out of this arbitration agreement by emailing support@buildsolver.com with subject “Arbitration Opt-Out” within 60 days of first accepting these Terms. Opt-out does not affect any other provision.

Small claims & statutory rights. Either party may bring an individual claim in small claims court if it qualifies. Nothing in these Terms limits your rights to dispute a charge with your card issuer under the Fair Credit Billing Act or applicable card-network rules.

Canadian users — non-waivable rights. Certain Canadian provinces (including British Columbia, Ontario, and Quebec) provide consumers with non-waivable rights and remedies under provincial consumer protection law. Nothing in these Terms limits any such rights or remedies where they apply to you under applicable Canadian provincial or federal law.

Arbitration jurisdiction fallback.For users in jurisdictions where mandatory pre-dispute arbitration of consumer claims is unenforceable as a matter of law (including Australia under the Australian Consumer Law and certain Canadian provinces), disputes that cannot be required to go to arbitration may instead be brought in the courts of competent jurisdiction of the user's principal place of residence, and Neurolinker AI LLC consents to personal jurisdiction in those courts for that limited purpose.

We may update these Terms. For material changes affecting your rights or obligations, we give at least 30days' advance notice by email to the address on your account. The “Last updated” date at the top reflects the current version. If you keep using the Service after the effective date, you have accepted the update. If not, cancel from /account.

If any provision of these Terms is held invalid or unenforceable, that provision is modified to the minimum extent necessary and the remaining provisions remain in full force. Our failure to enforce any provision is not a waiver.

No third-party beneficiaries. These Terms are for you and Neurolinker AI LLC only. End clients, project owners, occupants, or Authorities Having Jurisdiction have no right to enforce them.

Assignment. You may not assign these Terms without our prior written consent. We may assign these Terms in connection with a corporate transaction.

These Terms, together with our Privacy Policy and Refunds & Cancellation Policy, are the entire agreement between you and Neurolinker AI LLC regarding the Service.

General questions: support@buildsolver.com or +1 (646) 814-3156. For legal notices and service of process, mail to Neurolinker AI LLC at the registered office: 5830 E 2nd St, Ste 7000, #27116, Casper, WY 82609, USA.