What a great place for truckers to deliver loads. Unloaded in no time, the forklift driver NATHAN is the nicest persons ever.Keep it up guys!

The HVAC certifications offered here are immensely industry standard and current. You get all your certifications in one spot so you can always reference back to them if you need to reprint or order more you can get hard cards as well as certificates this is a phenomenal resource for an HVAC professional. Also, their customer service is by far one of the best.

I have taken all of the online courses and tests that Mainstream gives (except for the EPA 608 which for the Universal level has to be proctored). This was out of both interest and because I teach college level environmental science. I found them to be very informative on the topics presented, well organized, and clearly written. In short, they did a good job with them and I learned a lot. It is a pleasure to recommend these courses.

This is where I was able to get my first Certification that lead me to be where I am today in the Industry.I didnt pass the first time, but after my phone call to Mainstream about my test and the results, an agent was able to see & correct some mistakes that had been made on the scoring, at that time, and then allow me to get my certification. The Mainstream Engineering downloadable test program REALLY helped me a lot with my test. With an almost exact test-like experience on my laptop, I was able to be prepared for the real test.

It is a great company and they have great products and they are known nation wide I have every license that they carry.

Called with some issues with my certs. And low and behold the lovely lady was able to find my account my certs and they arrived in the mail a week later! Couldn’t be happier

Great people, I was a contractor for them. Very clean and well organized.

I took the Universal HVAC tech test 18 years ago and MEC is still in business, since then I have taken the MVAC and the company is still very professional and more importantly nationally accepted.

The EPA course was well thought out with technical definitions and information flow cohesive and understandible.

Good and fair price, while covering the essentials during the exam.

Have taken a few test through them and I have had no issues. Very helpful staff. There products are also well liked.

At my job in Pennsylvania needed me to be EPA Section 608 Technician type 1 Certified. I took the test and passed it. When I got my certification card and showed it to my manager they said it was invalid. That I had to take their test to be certified by ESCO Institute. How can I Prove them wrong

Hook me up with a free test and more good reviews 😉 easy to use site , cheapest I could find. Got my card quick and online test wasn’t buggy at All. Thanks

Avoid doing any business with this company,

Gerat company , excellent product line, great lab services, and dynamic training and certifications

Great way to learrn. Material is presented in a logical progression without being overly repetitive.

The online study and testing materials were all I needed to not only learn more about working with refrigerant and associated equipment, but I was also able to pass the test without any problems.

The study materials were fantastic was easy to follow program and I passed on the first try.

You have a wide range of good stuff but last time i applied for my MVAC card and have never received it up to now

Mainstream engineering makes it easy to take test online and they have great products for the HVAC industry!

They have done a great job of making the process as smooth as possible.

Excellent testing good price point everybody should do it dont hesita

I have a great experience with Mainstream....although i need to study a little more.

Mainstream made the process of obtaining the EPA 608 Type 1 quick and easy.

Ive been using their testing services since last year, so far with 5 certifications and am enjoying every bit of the online training from their study software. 6 stars.

I am an owner of a small private HVAC School in florida & it has been an honor to work with one of the best industry organizations such as Mainstream Engineering. Their study materials are very simple to understand for my students and highly recognized. I recommend all proctors to be a part of Mainstream Engineering Corporation.

Easy to follow and easy to learn would recommend this to others for sure.

I hope to receive the news of a new course. I have appreciated it.

The study material is very good and close to the actual test.

Very fast and convenient. I use it for all my employees.

I thiught tge Mainstream test was very interesting and the study guide was outstanding

All easily and quick!

Excellent site.

Study material for certification R-410A👍

Yes it is thank you.

Easy to use

Excellent