Zaiyi Liao

Really helpful and supportive professor. His teaching style is approachable and student-focused, he often went over concepts multiple times to ensure everyone understood. He made complex topics easier to grasp, especially for those new to HVAC. He genuinely cares about his students' learning and success.

His lectures were usually inaudible and he seemed entirely unengaged with the class. He managed to make an easy class into a confusing one and was very repetitive and disorganized.

Took this HVAC class hoping to learn, but it was a struggle from start to finish. The prof lacked clarity, rarely followed a plan, and seemed uninterested in helping students. There was no real guidance, and the rude attitude made it worse. A disappointing and stressful experience.

The professor made HVAC harder than it needed to be. Disorganized lectures, confusing explanations, and zero engagement with students. Questions were brushed off or met with sarcasm. The class felt chaotic and unwelcoming. Learned more from the textbook than the actual teaching.

He hand writes all his lectures and is very difficult to follow. He is hard to listen to and hard to understand. He makes this topic more confusing than it has to be.

This HVAC course was a mess. The professor was hard to follow, unprepared, and often rude when students asked questions. There was no clear structure, and lectures didn't match the assignments. It felt like we were on our own the whole time. Definitely would not recommend.

Nobody taking his class understands the content that he is teaching. He writes all his notes by hand which takes a long time and is hard to read at times. There have been complaints to the department about him throughout the semester. Unfortunately his course is required.

Disorganized lectures, poor explanations, and a rude attitude made this HVAC class extremely frustrating. The professor didn't connect with students or encourage questions. Content was unclear, grading felt inconsistent, and the overall learning environment was negative and unhelpful.

Incredibly frustrating being in the lecture. Hard to keep up, constantly side-tracking, and constantly making the lecture un engaging, and even he seems like he doesn't want to be there.

Professor is not reasonable. Class content is different from what is asked on the exams and his notes are extremely hard to read (all class content is hand-written). I have never seen so many people fail a class.