Questions, answered straight
Everything below is answered the way we would answer it in an email. Where the honest answer is no, or depends on the equipment in front of you, that is what it says. If your question is not here, infohvacresource@gmail.com reaches a person.
Using HVAC Resource
What is HVAC Resource?
A study and reference hub for HVAC/R technicians, apprentices and students. The Code collects the rules behind the readings, Field Notes explains the trade in plain language, and 14 practice quizzes let you test yourself one topic at a time.
The reading and the quizzes are free. When you order from the store, shipping is free on every order.
Are the quizzes really free? Do I need an account?
Yes, they are free, and no, you do not need an account. Open a quiz and start answering. Every question tells you whether you were right and explains why, and you get a score at the end.
Nothing is saved, so reloading the page starts the quiz over. See all 14 quizzes.
Can I use the quizzes with my apprentices or in a classroom?
Yes. Put one on a screen in class, send the link to an apprentice, or work through one together at the start of a shift. Please link to them rather than copying the questions into your own material, so you always have the current version.
Are these the same questions as the EPA 608 exam?
No. They are practice on HVAC fundamentals, written by us, not copies of any certification exam. Section 608 certification is issued through EPA-approved certifying organizations, and EPA publishes what each certification type covers: EPA Section 608 certification types.
Do you cover R-32 and R-454B?
Yes. The Code has a section on A2L refrigerants and the move away from R-410A in new equipment, including EPA's 2026 change to the installation deadline. Field Notes covers what changes on the job: tools rated for A2L refrigerants, left-hand cylinder threads and refrigerant detection systems.
The manufacturer's instructions for the specific unit always come first.
On the job
Can you tell me what is wrong with my system?
No, and we will not guess. A diagnosis needs readings taken at the equipment by someone who can see it. An answer from someone who cannot is worth little to you and could cost you money. What we can do is point you to the part of The Code or Field Notes that tells you what to measure.
If you smell gas, leave the building and call your gas utility or 911 from outside. If a carbon monoxide alarm goes off, get everyone into fresh air and call 911.
Do I need EPA certification to work on air conditioning?
In the US, technicians who open the refrigerant circuit on stationary air conditioning or refrigeration equipment need Section 608 certification. Most residential and light commercial work falls under Type II, and Universal covers every type.
Intentionally venting refrigerant while servicing equipment is prohibited. EPA's venting prohibition page sets out the rule and its narrow exceptions.
Does anything here replace the manufacturer's instructions?
No. Our material explains how systems work and why the rules exist. The installation and service instructions for the equipment in front of you, and the codes your jurisdiction has adopted, decide what is right on a given job. Where they differ from a rule of thumb here, follow them.
Ordering and delivery
How long does shipping take, and what does it cost?
Orders are processed within 1 business day, Monday to Friday, and express delivery takes 5 to 15 business days. Shipping is free on every order. The full details are on the shipping policy.
Where do you ship?
The United States, Canada, the United Kingdom, Australia and New Zealand.
Customs fees, import duties and local taxes, where they apply, are set by your country. They are not included in the price you pay us and are the customer's responsibility.
Where is my tracking number?
It is emailed to you once your order ships. If you cannot find it, check your spam folder first, then see Track Your Order or email infohvacresource@gmail.com with your order number.
My parcel arrived damaged, or never arrived. Now what?
Email infohvacresource@gmail.com within 7 days of the delivery date with your order number and photographs of any damage, including the outer packaging if you still have it. A damaged, lost or wrong item is ours to sort out.
Returns and support
What is your return policy?
You have 3 days after your item arrives to request a return. It needs to be unused, in the condition you received it and in its original packaging, with proof of purchase.
Email us with your order number before sending anything back. If the return is accepted we send a return label and instructions, and approved refunds go back to your original payment method within 10 business days. The full terms are on the refund policy.
Can I return an eBook?
No. eBooks are delivered instantly and cannot be returned, so every eBook sale is final once it has been delivered.
If I email you, does a real person answer?
Yes. Email infohvacresource@gmail.com or use the contact page, and a person will answer within one business day.
Still stuck? Email us and a person will answer.
Contact support