Terms and Conditions

Last updated: 9 October 2026

This site is operated by QUILLSTONE DIGITAL LLC, 1057 NW 136TH AVE, Miami, FL 33182, United States, trading as Studio Facile. You can reach us at info@studiofacilebook.com and we answer within 24 hours on working days.

What we sell

Illustrated study material for HVAC students, technicians and EPA 608 candidates, delivered as downloadable PDF files. Nothing is shipped physically.

This is study material, not a course. It does not give credit, hours, a license or a certification. It is not affiliated with or endorsed by the EPA or any certifying organization. The EPA 608 exam is given by EPA-approved certifying organizations. The practice questions were written for this material.

Your purchase

One payment. There is no subscription and no recurring charge.
Payment is processed by Stripe. We never see or store your card number.
The download link is emailed to the address you enter at checkout, normally within a few minutes.
If a title is sold before it is finished, you receive it in the same folder as soon as it is ready, at no extra cost.

What you may and may not do with the files

You may read the files on your own devices and print them as often as you want for your own use. You may not resell them, share them publicly, upload them to file-sharing sites or distribute them to third parties.

Refunds

See the refund policy.

Liability

We take care that the content is accurate. Even so, the material is educational: the manufacturer's instructions, your instructor, your employer's procedures, local codes and EPA regulations always come first. Power off, lock out and test before you touch, and work on gas appliances and refrigerant only as far as your training and certification allow. To the extent allowed by law, our liability is limited to what you paid.

Changes and governing law

We may update these terms; the date at the top shows when. These terms are governed by the laws of the State of Florida, United States.